Musculoskeletal

Sports medicine: concussion and return-to-play

Clinical Overview and When to Suspect Sport-Related Concussion

— Confusion, "feeling foggy," slowed reaction

— Headache, dizziness, nausea, photophobia/phonophobia

— Balance problems, gait unsteadiness

— Amnesia (retrograde or anterograde)

— Emotional lability, irritability

— Sleep disturbance starting after event

— Vacant stare, delayed verbal/motor responses

— GCS <15 at 2 hours, focal neuro deficit, repeated vomiting, seizure

— Suspected skull fracture, worsening headache, increasing confusion

— Anticoagulation use, age >65, dangerous mechanism

— These map onto the Canadian CT Head Rule — the preferred validated decision tool.

Definition: Sport-related concussion (SRC) is a traumatic brain injury induced by biomechanical forces, producing a transient neurofunctional disturbance — typically without structural imaging abnormality.

Epidemiology: ~1.6–3.8 million sports/recreation-related concussions occur annually in the US. Highest rates: football, ice hockey, soccer, lacrosse, rugby; in females — soccer and basketball carry highest rates.

Mechanism: Direct blow to head, face, neck, or impulsive force transmitted to the head (whiplash). Loss of consciousness occurs in only <10% — its absence does not rule out concussion.

When to suspect — any of these after a collision/impact:

Red flags mandating emergency evaluation/CT head:

Step 3 management: In an office/sideline setting, any athlete with suspected concussion must be immediately removed from play — "When in doubt, sit them out." Same-day return is never appropriate in any age group.

Board pearl: Concussion is a clinical diagnosis. Standard CT and MRI are typically normal — imaging is used only to exclude structural injury (hemorrhage, fracture), not to confirm concussion.

Key distinction: Subconcussive impacts (repetitive sub-threshold hits) are not concussions but may contribute to long-term cumulative neurologic risk (CTE concerns) — relevant for counseling.

Presentation Patterns and Key History

— Somatic: headache (most common, ~85%), nausea, dizziness, visual blurring, photophobia/phonophobia, balance issues

— Cognitive: "don't feel right," fogginess, slowed thinking, difficulty concentrating/remembering

— Emotional: irritability, sadness, anxiety, emotional lability

— Sleep: insomnia, hypersomnia, drowsiness

— Mechanism, exact time of injury, witnessed LOC and duration, post-traumatic amnesia duration

— Immediate symptoms vs delayed onset

— Helmet/mouthguard use, repeat impacts in same event

— Prior concussions — number, recovery duration, time since last (most important modifier of recovery)

— Migraine history, ADHD, learning disability, mood/anxiety disorder, sleep disorder — all prolong recovery

— Medications (anticoagulants, stimulants, SSRIs)

— Cervical spine symptoms (neck pain, radiculopathy) — overlap with whiplash

— Younger age (adolescents > adults)

— Female sex

— Prior concussion(s), especially within 1 year

— Migraine history, psychiatric history, learning disability

— High initial symptom burden, early dizziness

— LOC >1 min, prolonged amnesia

Symptom clusters (22-item SCAT6 symptom checklist groups them):

Time course: Symptoms usually peak within 24–72 hours. Most adults recover within 14 days; adolescents within 4 weeks. Persistence beyond these windows defines persisting post-concussive symptoms (PPCS).

High-yield historical features to elicit:

Modifiers prolonging recovery (memorize for boards):

Board pearl: Dizziness on the sideline is the single best predictor of prolonged recovery (>21 days) — more predictive than LOC or amnesia.

Key distinction: Differentiate concussion from cervicogenic headache, vestibular dysfunction, and post-traumatic migraine — all may coexist and need targeted rehab rather than just rest.

Physical Exam Findings and Sideline Assessment

— Glasgow Coma Scale — should be 15; any decrement is a red flag

— Maddocks questions (orientation to sport context: venue, period, last score, opponent won/lost last game)

— Symptom evaluation (22-item scale, severity 0–6)

— Cognitive screen (orientation, immediate memory, concentration — months reverse, digits backward, delayed recall)

— Neurologic screen (cervical spine, cranial nerves, coordination — finger-to-nose, tandem gait)

— Balance — modified BESS (Balance Error Scoring System): double-leg, single-leg, tandem stances on firm/foam surface

— Palpation, ROM, Spurling test, distraction test

— If midline tenderness, neuro deficit, or high-risk mechanism → immobilize and image per NEXUS/Canadian C-spine rules

Sideline tools: SCAT6 (adults), Child SCAT6 (ages 8–12), SCOAT6 (office, 72 hours+). Components:

Vestibular/Ocular Motor Screen (VOMS): smooth pursuit, saccades, near-point convergence, VOR, visual motion sensitivity — provocation of symptoms suggests vestibulo-ocular dysfunction (treatable with vestibular therapy).

Cervical spine exam — mandatory:

Cranial nerve and motor exam: Pupillary response (anisocoria is a red flag), extraocular movements, facial symmetry, motor strength, reflexes, sensation.

Coordination: finger-nose-finger, heel-shin, rapid alternating movements, tandem gait — tandem gait is the most sensitive bedside cerebellar test post-concussion.

CCS pearl: On the inpatient/observation order set, serial neurochecks q2h × first 24h, monitor for declining GCS, asymmetric pupils, projectile vomiting, focal deficits — any deterioration → STAT non-contrast CT head.

Board pearl: Same-day SCAT comparison to baseline (when available) is more reliable than absolute scores — preseason baseline testing is standard for organized contact sports.

Diagnostic Workup — Initial Imaging and Decision Rules

— High risk (mandates CT):

— GCS <15 at 2 hours post-injury

— Suspected open or depressed skull fracture

— Any sign of basilar skull fracture (raccoon eyes, Battle sign, hemotympanum, CSF oto/rhinorrhea)

— Vomiting ≥2 episodes

— Age ≥65

— Medium risk (rules out need for neurosurgery):

— Retrograde amnesia ≥30 min

— Dangerous mechanism (ejection, fall >3 ft or 5 stairs, pedestrian struck)

— Anticoagulant or antiplatelet use (low threshold; some advocate routine CT in anticoagulated patients regardless of exam)

— Bleeding diathesis, posttraumatic seizure

— Worsening or persistent severe headache, focal neurologic deficit

— Suspected non-accidental trauma in children

Concussion is a clinical diagnosis — no test confirms it. Workup focuses on excluding structural intracranial injury.

CT head (non-contrast) — first-line emergency imaging. Indications via Canadian CT Head Rule (validated for minor head injury, GCS 13–15):

Additional CT indications:

What CT looks for: epidural hematoma, subdural hematoma, subarachnoid hemorrhage, intraparenchymal contusion, cerebral edema, skull fracture, pneumocephalus.

C-spine imaging: Apply NEXUS criteria or Canadian C-Spine Rule — image if midline tenderness, focal neuro deficit, altered mental status, intoxication, distracting injury, or high-risk features.

Labs: Generally not required for uncomplicated concussion. Consider CBC, coagulation studies in anticoagulated patients or if intracranial bleed suspected.

Blood-based biomarker (newer): FDA-approved GFAP + UCH-L1 (i-STAT TBI Plasma) can rule out need for CT in adults within 12h of injury when negative — emerging but not yet universal standard.

Board pearl: Imaging normal ≠ no concussion. A negative CT in a symptomatic athlete is expected — diagnosis remains clinical and the athlete still cannot return that day.

Step 3 management: In a stable ambulatory athlete with no red flags, no imaging is required — proceed to clinical management and graduated return-to-play protocol.

Diagnostic Workup — Advanced and Confirmatory Studies

— Symptoms persisting beyond expected recovery window (>14 days adults, >28 days adolescents/children)

— Worsening neurologic exam despite normal CT

— Suspected diffuse axonal injury, subtle contusion, or hemorrhagic shear injury

— Pre-clearance evaluation in elite athletes with prolonged symptoms

— Sequences: Susceptibility-weighted imaging (SWI) detects microhemorrhages; DTI (research) detects white matter tract injury.

— Computerized (ImPACT, CNS Vital Signs, Axon Sports) — measures reaction time, memory, processing speed

— Most valuable when compared to preseason baseline

— Adjunct, not a stand-alone diagnostic — clinical symptoms supersede test scores in return-to-play decisions

— Used for objective evidence of cognitive recovery prior to full contact return

— Formal VOMS, computerized dynamic posturography, video-nystagmography if prolonged dizziness/balance issues

— Refer to vestibular physical therapy if VOR or visual motion sensitivity deficits persist >10–14 days

— Persistent neck pain, occipital headache, or cervicogenic features → consider cervical MRI, refer to PT for manual therapy and proprioceptive retraining

MRI brain — indications:

Neuropsychological testing:

Vestibular/ocular evaluation:

Cervical spine evaluation:

EEG / sleep studies: Not routine; consider EEG if post-traumatic seizures suspected.

Endocrine evaluation: In prolonged recovery (>3 months) with fatigue, weight changes, menstrual irregularity, or cognitive symptoms — screen for post-traumatic hypopituitarism (morning cortisol, TSH/free T4, IGF-1, prolactin, LH/FSH, testosterone/estradiol). Uncommon but underdiagnosed.

Key distinction: Persistent symptoms beyond expected windows should prompt a multi-domain evaluation (vestibular, ocular, cervicogenic, mood, sleep, autonomic, migraine) — concussion is rarely a single-pathway problem after week 2.

Board pearl: No biomarker, imaging, or neurocognitive test alone establishes readiness for return to play. Clinical resolution of symptoms at rest and with exertion remains the gold standard.

Risk Stratification and Initial Management Logic

— Immediate removal from play (mandatory, even if symptoms resolve quickly)

— Sideline evaluation with SCAT6 / red-flag screen

— Cervical spine clearance

— ED transfer if any red flag; otherwise observation with caregiver

— Provide written discharge instructions, return precautions, follow-up within 24–72 hours with a clinician familiar with concussion

— Strict rest is no longer recommended. Old "cocoon therapy" (dark room × days) prolongs recovery.

— Relative rest × 24–48 hours, then introduce sub-symptom-threshold aerobic activity (light walking, stationary bike)

— Sleep hygiene, hydration, avoidance of alcohol and recreational drugs

— Limited screen time in first 48 hours, then gradual reintroduction

— Adolescent age, female sex, prior concussions

— Migraine, ADHD, learning disability, anxiety/depression

— High initial symptom burden (>15 symptoms or severity >40)

— On-field dizziness, amnesia, LOC >1 min

— Standardized exertion test to identify heart rate threshold at which symptoms exacerbate

— Athlete exercises at 80–90% of that HR threshold daily → shortens recovery vs symptom-limited rest

— Cognitive/fatigue, vestibular, ocular, post-traumatic migraine, cervical, anxiety/mood — each gets a targeted referral

Acute management algorithm (first 24–72 h):

Initial activity guidance — paradigm shift:

Risk modifiers identifying slow recovery (counsel families upfront):

Buffalo Concussion Treadmill Test (BCTT):

Subtypes (Pittsburgh model) directing therapy:

Step 3 management: In office on day 2 post-injury — (1) document red-flag absence, (2) prescribe relative rest × 48h then sub-threshold aerobic exercise, (3) initiate graduated return-to-school before return-to-play, (4) schedule follow-up in 1 week or sooner if worsening.

Board pearl: Early light aerobic activity (within 48 hours) below symptom threshold is now evidence-based to reduce recovery time — replacing prolonged rest.

Pharmacotherapy — Symptom-Targeted Treatment

— No medication treats concussion itself. Pharmacotherapy targets specific persistent symptoms when conservative measures fail.

— Avoid NSAIDs and aspirin in the first 24–48 hours (theoretical bleeding risk if undetected intracranial injury); acetaminophen preferred initially.

— Avoid sedating agents that mask neurologic deterioration in the acute period.

— Acute: acetaminophen first-line; transition to NSAIDs after 48h if intracranial hemorrhage excluded

— Caution: medication-overuse headache if used >2–3 days/week beyond 2 weeks

— Post-traumatic migraine: triptans for abortive use; preventive therapy if frequent — amitriptyline, topiramate, propranolol (avoid propranolol in athletes during recovery as it blunts exertion testing), or gabapentin

— Sleep hygiene first

— Short-term: melatonin 3–10 mg nightly (best evidence in adolescents)

— Avoid benzodiazepines and chronic z-drugs

— Low-dose trazodone or amitriptyline if insomnia and headache coexist

— Counseling/CBT first-line

— SSRIs (sertraline, escitalopram) if persistent depression/anxiety >4 weeks

— Generally resolve without pharmacotherapy

— In refractory cases, methylphenidate or amantadine have limited evidence — specialist use only

— Vestibular rehabilitation is first-line — avoid meclizine chronically (delays central compensation)

— Manual therapy, PT; short-course NSAIDs, muscle relaxants if needed

General principles:

Headache (most common symptom):

Sleep disturbance:

Mood/anxiety symptoms:

Cognitive symptoms/fatigue:

Dizziness/vestibular:

Cervicogenic symptoms:

Board pearl: Polypharmacy is a red flag in concussion management — prefer targeted, time-limited therapy with a clear stop date.

Step 3 management: For an adolescent with post-concussive headache and insomnia at 2 weeks → start melatonin at bedtime, acetaminophen PRN with strict frequency cap, refer for CBT and vestibular PT, and schedule reassessment in 2 weeks.

Graduated Return-to-Play and Return-to-Learn Protocols

— Stage 1: Daily activities at home not causing symptoms (reading, light screen)

— Stage 2: School activities (homework outside class)

— Stage 3: Return to school part-time with accommodations (rest breaks, reduced workload, extra time on tests)

— Stage 4: Full return to school

— Stage 1: Symptom-limited activity (daily activities not provoking symptoms)

— Stage 2: Light aerobic exercise (walking, stationary bike <70% max HR; no resistance)

— Stage 3: Sport-specific exercise (running drills; no head impact)

— Stage 4: Non-contact training drills (more complex; resistance training introduced)

— Stage 5: Full-contact practice (medical clearance required before this stage)

— Stage 6: Return to competition

— Minimum 24 hours per stage → minimum 6 days total RTP

— If symptoms recur, drop back one stage and retry after 24 hours symptom-free

— Full RTP only after asymptomatic at rest and with exertion, off all symptom medications, neurologic exam normal, neurocognitive testing returned to baseline

Return-to-Learn (RTL) precedes Return-to-Play (RTP) — academic clearance first.

Return-to-Learn — 4 stages, advance every 24 hours as tolerated:

Return-to-Play — 6 stages (Amsterdam/Concussion in Sport Group):

Rules of progression:

Medical clearance required before Stage 5 — by a physician trained in concussion management; many states require this by law.

Pediatric/adolescent rules: More conservative — most state laws (all 50 states have youth concussion laws since 2014) mandate clearance by licensed health professional and prohibit same-day RTP for youth athletes.

CCS pearl: Order set for follow-up visit — "Concussion symptom checklist, BCTT, cervical exam, VOMS, advance to next RTP stage, return in 5–7 days, written letter to school/coach documenting clearance status."

Board pearl: No same-day return-to-play at any age, ever — even if symptoms appear to resolve within minutes. This is the most testable point.

Special Populations — Older Athletes and Comorbid Conditions

— Higher risk of intracranial hemorrhage for any given mechanism due to brain atrophy stretching bridging veins (subdural hematoma risk)

— Lower threshold for CT imaging

— Slower symptom resolution

— CT head mandatory after any significant head impact, even without symptoms

— Observe for delayed intracranial hemorrhage — repeat CT or extended observation per institutional protocol (especially warfarin with INR >3)

— Consider reversal if hemorrhage present: vitamin K + 4F-PCC for warfarin, idarucizumab for dabigatran, andexanet alfa for apixaban/rivaroxaban

— Discussion of anticoagulation continuation must weigh stroke risk vs bleeding — multidisciplinary

— Acetaminophen safer than NSAIDs in CKD; reduce dose in significant hepatic dysfunction (max 2 g/day in cirrhosis)

— Adjust amitriptyline, gabapentin, topiramate doses in renal impairment

— Avoid NSAIDs in CKD stage 3+ and decompensated cirrhosis

— Pre-existing migraine, epilepsy, prior stroke — prolonged recovery, lower threshold for neurology referral

— Patients on SSRIs/SNRIs: be alert to serotonin syndrome risk if adding triptans

— Concussion may unmask or accelerate cognitive decline

— Baseline cognitive assessment harder to interpret; family input critical

Masters/older recreational athletes (>40 years):

Anticoagulated athletes (warfarin, DOACs, antiplatelet agents):

Renal/hepatic impairment:

Comorbid neurologic conditions:

Dementia/cognitive impairment:

Board pearl: In an elderly patient on warfarin with even minor head trauma and normal initial CT, current evidence supports either observation × 24h or repeat CT at 24h to detect delayed bleeding — institutional protocols vary, but never discharge without clear precautions.

Step 3 management: Older anticoagulated patient post-fall with head strike → CT head now, hold next dose pending results, recheck neuro exam at 6 and 24 hours, written return precautions to caregiver.

Special Populations — Pediatrics, Female Athletes, and Pregnancy

— Symptoms last longer than adults — typical recovery up to 4 weeks (vs 2 weeks)

— More vulnerable to second impact syndrome — catastrophic cerebral edema after a second concussion while still symptomatic from the first; nearly always in athletes <21

— Use Child SCAT6 (ages 5–12) and parent-report symptom scales

— PECARN rule preferred over Canadian CT Head Rule in children <16 — minimizes CT exposure

— Age <2: altered mental status, LOC ≥5s, severe mechanism, palpable skull fracture, non-frontal scalp hematoma, abnormal behavior per parent

— Age ≥2: altered mental status, LOC, vomiting, severe headache, severe mechanism, basilar skull fracture signs

— Adolescents need academic accommodations — formal 504 plan if symptoms persist >2 weeks

— Higher concussion rates per athletic exposure in sex-comparable sports (soccer, basketball)

— Longer recovery times; more symptoms reported

— Hormonal fluctuations (luteal-phase injury may prolong symptoms — emerging data)

— Higher prevalence of post-concussion migraine

— Standard concussion evaluation applies; CT head is justified when indicated — fetal radiation dose minimal with abdominal shielding

— Prefer MRI without gadolinium for non-emergent advanced imaging

— Avoid NSAIDs after 20 weeks (oligohydramnios) and in third trimester (premature ductal closure)

— Acetaminophen is preferred analgesic

— Avoid topiramate (teratogenic, cleft lip/palate), valproate; sertraline preferred SSRI

— Consider OB co-management; monitor fetal status if significant trauma

Pediatric and adolescent athletes:

Female athletes:

Pregnancy:

Board pearl: Second impact syndrome is rare but catastrophic — mortality ~50%, severe morbidity nearly 100%. It is the central reason for strict no-same-day RTP rules in youth sports.

Key distinction: A youth athlete with persistent symptoms at 4 weeks meets criteria for persisting symptoms after concussion and warrants subspecialty referral — earlier referral than for adults.

Complications and Adverse Outcomes

— Catastrophic cerebral edema after a second head impact while still symptomatic from a prior concussion

— Loss of cerebral autoregulation → diffuse swelling, herniation, often fatal

— Almost exclusively in athletes <21 years

— Prevention: strict adherence to no-same-day RTP and stepwise progression

— Symptoms beyond 14 days adults / 28 days youth

— Multimodal management: vestibular PT, cervical PT, CBT, graded aerobic exercise, targeted pharmacology

— Most resolve within 3 months; small subset develop chronic symptoms

— Tension-type or migraine phenotype

— Risk of medication-overuse headache with frequent analgesic use

— Depression, anxiety, irritability, suicidality (especially in adolescents)

— Screen with PHQ-9 and GAD-7 at follow-up visits

— Increased suicide risk in months following concussion — counsel families

— Short-term: attention, memory, processing speed deficits

— Usually resolve within weeks; persistent deficits warrant neuropsychology referral

— Insomnia or hypersomnia in 30–70%

— Often persists longest of all symptoms

— Exercise intolerance, dizziness, orthostatic symptoms

— BCTT helps identify; graded exercise treats

— Neurodegenerative tauopathy associated with repetitive head impacts, not necessarily symptomatic concussions

— Diagnosed only at autopsy currently

— Risk relates to cumulative exposure (years of contact sport)

— Counsel athletes/families about long-term risk in repeat-concussion scenarios

Second Impact Syndrome (SIS):

Persisting symptoms after concussion (formerly "post-concussion syndrome"):

Post-traumatic headache:

Mood and behavioral sequelae:

Cognitive sequelae:

Sleep disturbance:

Autonomic dysfunction:

Chronic Traumatic Encephalopathy (CTE):

Post-traumatic seizures: Rare; if present, require neurology evaluation and EEG.

Post-traumatic hypopituitarism: Consider in prolonged recovery with fatigue, sexual dysfunction, menstrual changes.

Board pearl: Suicide risk screening is now a recommended component of every follow-up concussion visit, particularly in adolescents — testable patient-safety item.

When to Escalate — ED, Neurosurgery, and Inpatient Triage

— GCS <15 or declining

— Focal neurologic deficit (weakness, aphasia, anisocoria, ataxia disproportionate to expected)

— Repeated vomiting (≥2 episodes)

— Seizure (post-traumatic, even single episode)

— Worsening headache despite analgesia

— Signs of skull fracture: Battle sign, raccoon eyes, hemotympanum, CSF leak

— Penetrating injury or open skull fracture

— Suspected cervical spine injury

— Anticoagulant use with significant impact

— Any acute intracranial hemorrhage on CT (epidural, subdural, subarachnoid, intraparenchymal)

— Depressed or open skull fracture

— Significant midline shift or mass effect

— Worsening neurologic exam with abnormal imaging

— GCS ≤8 → intubation, ICP monitoring consideration

— Significant intracranial hemorrhage requiring close monitoring

— Post-craniotomy patients

— Hemodynamic instability, refractory seizures

— Sports medicine/concussion clinic: symptoms persisting >10–14 days

— Neurology: post-traumatic seizures, focal deficits, persistent severe headache, suspected migraine variant

— Neuropsychology: persistent cognitive symptoms, RTL difficulty

— Vestibular PT/audiology: dizziness, vertigo, balance deficits >2 weeks

— Ophthalmology/neuro-optometry: persistent visual symptoms, convergence insufficiency

— Psychiatry/psychology (CBT): mood symptoms, anxiety, sleep, somatic symptom amplification

— Physiatry/PT: cervicogenic symptoms, deconditioning

Immediate transfer to ED / activate EMS:

Neurosurgical consultation indications:

ICU admission criteria:

Outpatient subspecialty referral:

CCS pearl: Order set for admission for observation — "Neurochecks q1h × 4 then q2h × 20, head of bed 30°, no anticoagulants/antiplatelets, acetaminophen PRN, NPO until cleared, repeat CT head if neuro change, neurosurgery consult if hemorrhage."

Board pearl: An athlete with post-traumatic seizure, even brief, is not a candidate for routine outpatient concussion management — neurology referral and consideration of EEG are mandatory.

Key Differentials — Other Traumatic Brain Pathologies

— Arterial bleed (middle meningeal artery), typically from temporal bone fracture

— Classic "lucid interval" followed by rapid deterioration

— CT: lentiform (lens-shaped) hyperdensity, does not cross suture lines

— Neurosurgical emergency — craniotomy if symptomatic

— Venous bleed (bridging veins), common in elderly, anticoagulated, alcoholics

— Acute (<3 days), subacute, or chronic presentation

— CT: crescent-shaped, crosses suture lines, may cross midline

— Management depends on size, midline shift, symptoms — burr hole vs craniotomy vs observation

— Blood in sulci, basal cisterns on CT

— Usually managed conservatively if isolated and small; vasospasm less common than aneurysmal SAH

— Focal hemorrhagic injury at coup/contrecoup sites (frontal/temporal poles)

— May expand over 24–72h → repeat CT

— High-acceleration/deceleration injury (MVC, falls)

— Often CT-negative; MRI shows punctate hemorrhages at gray-white junction, corpus callosum

— Prolonged coma, poor prognosis

— Always co-evaluate — overlap of mechanism

— Diffuse cerebral edema after second hit while symptomatic

— Linear, depressed, basilar — basilar fractures present with Battle/raccoon signs, CSF leak

— Depressed fractures with >1 table depth or open fractures → neurosurgical repair

— Traumatic carotid or vertebral artery dissection — neck pain, Horner syndrome, focal deficit hours-days post-trauma; CTA/MRA to diagnose

Epidural hematoma:

Subdural hematoma:

Subarachnoid hemorrhage (traumatic):

Cerebral contusion:

Diffuse axonal injury (DAI):

Cervical spine injury:

Second Impact Syndrome:

Skull fracture:

Vascular injury:

Key distinction: A concussion is functional; the differentials above are structural and CT-detectable. Any focal/persistent/worsening deficit demands re-imaging because a concussion mimic may be evolving.

Board pearl: "Lucid interval → rapid decline" stem = epidural hematoma until proven otherwise; "elderly fall, headaches, gradual confusion over weeks" = chronic subdural.

Key Differentials — Non-Traumatic and Functional Mimics

— Especially in patients with prior history; trigger may be exertion rather than impact

— Photophobia, phonophobia, nausea overlap with concussion

— Key distinction: Migraine recurs without inciting impact; concussion ties symptoms to a specific event

— Neck pain, occipital headache, restricted ROM, suboccipital tenderness

— May coexist with concussion; treated with manual therapy, PT

— Distinguish: cervical pain reproducible with palpation/movement

— BPPV: positional vertigo with Dix-Hallpike-induced nystagmus; treated with Epley maneuver

— Vestibular neuritis, labyrinthitis: continuous vertigo with nausea, no impact

— Sideline athlete with confusion, headache, nausea after exertion

— Check temperature, glucose, hydration before assuming concussion

— Collapse may simulate post-impact LOC

— Witness account critical; ECG indicated

— Endurance athletes with confusion, headache, vomiting → check sodium

— Persistent symptoms disproportionate to injury, often with secondary gain

— Diagnosis of exclusion; CBT first-line

— May develop after concussion or independently; can amplify symptom perception

— Always consider in sideline confusion

— Symptoms incompatible with neuroanatomy; positive Hoover sign, give-way weakness

— Cognitive symptoms in adolescents may overlap baseline ADHD difficulties — get pre-injury school performance data

Migraine (with or without aura):

Cervicogenic headache and whiplash-associated disorder:

Vestibular pathology:

Heat illness / dehydration / hypoglycemia:

Exertional syncope / cardiac arrhythmia:

Hyponatremia (exercise-associated):

Psychogenic / somatic symptom disorder:

Mood disorder, anxiety, PTSD:

Substance use / intoxication:

Functional neurologic disorder:

ADHD/learning disability flare:

Step 3 management: In a collegiate runner who collapses with confusion after a 10K, check glucose, sodium, core temperature, and obtain ECG before attributing to concussion — broad mimics first.

Board pearl: Persistent symptoms in a patient with clear secondary gain (litigation, school avoidance) should still receive standard evaluation — but include CBT-based rehabilitation early; do not dismiss.

Secondary Prevention and Long-Term Planning

— Athletes, parents, coaches, officials trained to recognize concussion

— "When in doubt, sit them out" culture

— Mandatory preseason education in many state laws and at NCAA/professional levels

— Properly fitted helmets reduce skull fractures and severe TBI but do NOT prevent concussion (rotational forces unaffected)

— Mouthguards reduce dental injury; limited evidence for concussion prevention

— Headgear in soccer/rugby — minimal evidence for concussion reduction

— Limiting full-contact practices in football reduces exposure

— "Heads up" tackling technique

— Banning bodychecking in youth ice hockey <13 reduced concussions ~50%

— Restricting headers in youth soccer (<11) per US Soccer guidelines

— Emerging evidence stronger cervical musculature attenuates head acceleration → reduced concussion risk

— For organized contact-sport athletes — facilitates post-injury comparison

— Multiple concussions (no absolute number; individualized)

— Decreasing threshold for concussion (each one with lower force)

— Increasing recovery time with each successive injury

— Persistent symptoms or measurable cognitive decline

— Structural abnormality on imaging

— Avoid alcohol/recreational drugs during recovery

— Sleep hygiene, hydration, balanced nutrition

— Cardiovascular fitness maintenance via non-contact activity

— Written clearance letters to schools and athletic departments

— Updated emergency action plans at all sports venues

Education — central to prevention:

Equipment:

Rule changes and technique:

Neck strengthening:

Baseline neurocognitive and balance testing:

Retirement-from-contact-sport counseling — consider after:

Lifestyle counseling for recovered patients:

Documentation and communication:

Board pearl: No helmet eliminates concussion risk — a "concussion-proof" helmet does not exist. Counsel families this is a common misconception.

Step 3 management: After 3rd concussion in 18 months in a 16-year-old footballer with prolonged recovery each time → multidisciplinary discussion (athlete, family, sports med, neuropsychology) regarding risk-benefit of continued contact participation, with shared decision-making documented.

Follow-Up, Monitoring, and Rehabilitation

— Initial reassessment within 24–72 hours of injury

— Weekly until symptom-free

— At each RTP stage advancement

— Final clearance visit before Stage 5 (full contact)

— Symptom checklist (SCAT6 or similar) with severity scores

— Neurologic and cervical exam

— VOMS screen if vestibular/ocular symptoms

— Tandem gait, BESS balance assessment

— Cognitive screen (orientation, memory, concentration)

— Mood screening (PHQ-9, GAD-7), sleep quality

— Academic/work functioning

— RTL stage progression

— Exercise tolerance (BCTT if persistent symptoms)

— Vestibular therapy: for persistent dizziness, gaze instability, motion sensitivity (gaze stabilization, habituation, balance exercises)

— Cervical PT: manual therapy, postural retraining, deep neck flexor strengthening

— Vision therapy/neuro-optometry: convergence insufficiency, accommodative dysfunction

— Aerobic exercise therapy: sub-symptom threshold training based on BCTT

— CBT: for mood symptoms, sleep, somatic amplification

— Sleep specialist: if persistent insomnia/hypersomnia >4 weeks

— Communicate with school nurse, counselor, teachers

— Frequent rest breaks, reduced screen time, extra time for assignments/tests

— Postpone high-stakes testing

— Gradual reintroduction over days to weeks

— Formal 504 plan if symptoms >2 weeks

— Written note specifying: symptom-free at rest and exertion, normal neurologic exam, completion of graded RTP protocol, parent/athlete educated on second-injury risk

Follow-up cadence:

What to monitor at each visit:

Targeted rehabilitation pathways:

Academic accommodations (RTL):

Clearance documentation:

CCS pearl: Follow-up visit order set — "Reassess symptom severity, repeat VOMS and BESS, advance RTP stage if tolerated, school accommodation letter, return in 5–7 days."

Board pearl: Aerobic exercise therapy within the first 2–10 days, prescribed at sub-symptom threshold based on BCTT, is the highest-level evidence-based intervention to shorten recovery — boards may test this paradigm shift.

Ethical, Legal, and Patient Safety Considerations

— All 50 US states have youth sports concussion laws since 2014

— Three core components:

— Annual education for athletes, parents, coaches

— Immediate removal from play of any athlete with suspected concussion

— Written clearance by qualified health professional before return

— Step 3 expects you to know clearance is legally required, not just medically advised

— Pressure from coaches, parents, athletes (and sometimes school administration) to clear early

— Physician's primary obligation is to the athlete's health, not athletic success

— Document all conversations and clearance decisions clearly

— Independent physician model preferred at college/professional levels

— After multiple concussions, full disclosure of risks (recurrent injury, prolonged recovery, possible long-term cognitive risk, CTE concerns) with adolescent and parent

— Document discussion of retirement option

— Respect athlete autonomy while ensuring decision is fully informed

— Health information not to be shared with coaches/teams without explicit consent (HIPAA, FERPA in school settings)

— Clearance letter conveys only fitness status, not clinical details

— Suspected non-accidental trauma in a pediatric patient (injury inconsistent with mechanism, repeated unexplained injuries) → mandatory child protective services report

— Verbal handoff to parent/guardian with written instructions before discharge

— Clear red-flag return precautions (worsening headache, repeated vomiting, seizure, confusion, weakness)

— Identify a competent adult to monitor athlete overnight; do not discharge alone

— Counsel against driving, operating heavy machinery, lifting/sports while symptomatic

— Document the counseling

State concussion laws (Lystedt-style):

Conflict of interest — "team physician dilemma":

Informed consent and shared decision-making:

Confidentiality:

Mandatory reporting:

Transition-of-care safety:

Driving and high-risk activities:

Step 3 management: A high school coach calls demanding clearance for the playoff game tomorrow despite the athlete still having headaches with exertion → decline, document, communicate decision to athlete and parent, provide written rationale; do not yield to non-medical pressure.

Board pearl: The most common patient-safety failure in concussion care is premature return-to-play driven by external pressure — your duty is to the patient, full stop.

High-Yield Associations and Rapid-Fire Facts

Most common symptom: headache (~85%)

LOC occurs in: <10% of concussions; absence does not rule out concussion

Best predictor of prolonged recovery: on-field/early dizziness

Typical recovery — adults: 10–14 days

Typical recovery — adolescents/children: up to 4 weeks

Minimum RTP duration: 6 days (one day per stage minimum)

Same-day RTP: never — at any age

Pediatric CT decision rule: PECARN

Adult CT decision rule: Canadian CT Head Rule

Cervical spine rules: NEXUS, Canadian C-Spine Rule

Sideline tool: SCAT6 (adult), Child SCAT6 (5–12)

Office tool 72h+: SCOAT6

Buffalo Concussion Treadmill Test: identifies HR threshold for sub-symptom exercise prescription

Catastrophic complication in youth: second impact syndrome (mortality ~50%)

Highest-risk sports — males: football, ice hockey, lacrosse, rugby

Highest-risk sports — females: soccer, basketball, lacrosse

Helmets prevent: skull fractures and severe TBI, NOT concussions

Bodychecking ban in youth ice hockey: ~50% reduction in concussions

First-line acute analgesic: acetaminophen (not NSAIDs in first 48h)

First-line sleep aid: melatonin

Vestibular dysfunction treatment: vestibular rehabilitation (avoid meclizine long-term)

Persistent symptoms threshold: >14 days adults, >28 days youth

Risk modifiers for prolonged recovery: female, adolescent, prior concussion, migraine, ADHD, learning disability, mood disorder

CTE risk relates to: cumulative subconcussive impacts, not just diagnosed concussions

Lystedt Law components: education, removal from play, written clearance

Anticoagulated patient with head impact: CT mandatory, even if asymptomatic

Pregnancy: acetaminophen safe; avoid NSAIDs >20 weeks; sertraline preferred SSRI

"Lucid interval": epidural hematoma classic

Crescent on CT: subdural hematoma

Lens-shaped on CT: epidural hematoma

Board pearl: Memorize the six RTP stages and the four RTL stages verbatim — high-yield Step 3 vignette anchor.

Key distinction: Concussion = functional diagnosis (clinical, imaging normal); structural intracranial injuries are CT-detectable and demand different management pathways.

Board Question Stem Patterns

— 16-year-old football player tackled, dazed for 30 seconds, now says he "feels fine." Coach wants him back in. → Answer: Remove from play, complete SCAT6, no same-day return regardless of symptom resolution.

— College soccer player headbutted, normal neuro exam, GCS 15, no vomiting, no amnesia, no high-risk features. → Answer: No CT indicated; clinical observation, follow-up in 24–72h.

— Athlete with worsening headache and one episode of vomiting 2 hours post-impact. → Answer: CT head non-contrast emergently.

— Patient initially "fine" after impact, deteriorates 2 hours later with anisocoria. → Answer: Epidural hematoma, emergent neurosurgery.

— Patient managed with strict dark-room rest × 2 weeks, still symptomatic. Next step? → Answer: Initiate sub-symptom threshold aerobic exercise; cocoon therapy is outdated.

— Athlete completed Stage 2 yesterday without symptoms; what's next? → Answer: Advance to Stage 3 (sport-specific exercise) today.

— Athlete develops headache during Stage 4 drills. → Answer: Stop, rest 24 hours, return to Stage 3 once asymptomatic.

— 15-year-old, 5 weeks post-concussion, daily headaches, school avoidance. → Answer: Multidisciplinary referral (concussion clinic, neuropsychology, CBT, vestibular PT), school accommodations.

— Adolescent with post-concussive insomnia at 2 weeks. → Answer: Melatonin and sleep hygiene; avoid benzodiazepines.

— 72-year-old on apixaban after head strike, asymptomatic. → Answer: CT head, observation.

— Coach demands clearance for playoff. Athlete still symptomatic on exertion. → Answer: Do not clear; document, communicate, hold to evidence-based protocol.

— 14-year-old returns to play same day, collapses after second hit, rapidly herniates. → Answer: Second impact syndrome; preventable by enforcing no-same-day RTP.

Pattern 1 — Sideline decision:

Pattern 2 — When to image:

Pattern 3 — Red flag escalation:

Pattern 4 — Lucid interval:

Pattern 5 — Rest paradigm:

Pattern 6 — RTP progression:

Pattern 7 — Symptom recurrence during progression:

Pattern 8 — Persistent symptoms:

Pattern 9 — Pharmacology:

Pattern 10 — Anticoagulated patient:

Pattern 11 — Coach pressure:

Pattern 12 — Second impact:

Board pearl: Step 3 vignettes most commonly test the timing and stepwise structure of RTP/RTL and the non-negotiability of same-day removal.

One-Line Recap

— Diagnosis is clinical — imaging excludes structural injury but does not confirm concussion. Use Canadian CT Head Rule (adults) or PECARN (children) to decide who needs CT.

— "When in doubt, sit them out" — same-day return-to-play is never appropriate; second impact syndrome is rare but often fatal in youth.

— Strict rest is outdated — relative rest × 24–48 hours, then sub-symptom threshold aerobic exercise (guided by Buffalo Concussion Treadmill Test) shortens recovery.

— Return-to-Learn precedes Return-to-Play — 4 RTL stages then 6 RTP stages, minimum 24 hours per stage (≥6 days total), with medical clearance required before full contact.

— Persistent symptoms = >14 days adults / >28 days youth → multidisciplinary care (vestibular PT, cervical PT, CBT, vision therapy, targeted pharmacology).

— No medication treats concussion itself — acetaminophen for early headache, melatonin for sleep, amitriptyline/topiramate for migraine prevention; avoid polypharmacy.

— Legal framework: all 50 states mandate education, removal from play, and written clearance for youth athletes.

The core teaching point: Sport-related concussion is a clinical, functional diagnosis requiring immediate removal from play, exclusion of structural injury when red flags exist, brief relative rest followed by early sub-symptom-threshold aerobic activity, and a stepwise return-to-learn before return-to-play protocol with mandatory written medical clearance — never same-day return at any age.

Rapid recap bullets:

Board pearl: When the stem describes any post-impact symptom in an athlete — even if seemingly trivial — the single best next step is removal from play and SCAT-based evaluation, never "observe on the sideline and reassess for return this period."

Step 3 management: Build every concussion management plan around four anchors — (1) rule out structural injury, (2) initiate early sub-threshold activity, (3) progress through RTL then RTP stepwise with documented clearance, (4) screen for and address mood, sleep, vestibular, and cervicogenic comorbidities at every follow-up.