Eduovisual
Musculoskeletal
Olecranon and prepatellar bursitis
— Olecranon bursitis: classic in students, dart players, plumbers ("student's elbow"), and patients with chronic leaning on hard surfaces.
— Prepatellar bursitis: "housemaid's knee," "carpet-layer's knee," "clergyman's knee" — repetitive kneeling occupations.
— Acute monoarticular trauma, crystal disease (gout, CPPD), and systemic inflammatory arthritis (RA) also drive non-septic cases.
— ~20% of olecranon and up to ~30% of prepatellar bursitis cases are septic, predominantly Staphylococcus aureus (≥80%), with MSSA > MRSA in most US outpatient settings.
— Entry portal is usually a small abrasion, eczema, or puncture overlying the bursa.
— Localized, well-circumscribed fluctuant swelling directly over the olecranon or patella with preserved joint range of motion (a critical distinguishing feature from true arthritis).
— Pain may be mild in chronic aseptic cases but prominent with overlying erythema and warmth in septic or crystal-induced flares.
— Diabetes mellitus, alcohol use disorder, immunosuppression (chronic steroids, HIV, transplant), hemodialysis, IV drug use, and prior bursal aspiration or steroid injection.
— Visible overlying skin breakdown or cellulitis.
Board pearl: Preserved passive range of motion of the elbow or knee in the setting of a tender, swollen posterior elbow or anterior knee mass is the single most useful bedside finding pointing to bursitis rather than septic arthritis — a distinction that drives the entire diagnostic and management pathway on Step 3.
— Direct blow (fall on flexed elbow, kneeling on gravel) followed within hours by a tense, painful swelling — often hemorrhagic bursitis.
— Ask specifically about anticoagulant use, which predisposes to hemobursa.
— Gradual, painless, doughy enlargement in patients who repeatedly lean on elbows (truckers, students) or kneel (flooring installers, gardeners, plumbers, clergy).
— Often bilateral and recurrent; minimal systemic symptoms.
— Rapid onset (hours to 2–3 days) of pain, erythema, warmth, and fever or chills in ~40–50%.
— Preceding skin break: insect bite, eczema, psoriasis plaque, abrasion, recent aspiration, or tattoo.
— Comorbid diabetes, ESRD on dialysis, chronic steroid use, IVDU, or alcohol use disorder dramatically raises pretest probability.
— Known gout or CPPD, prior podagra, tophi, recent diuretic initiation, binge alcohol, or red meat/seafood load.
— Can mimic septic bursitis exactly — both can show warmth, erythema, and leukocytosis.
— Background of rheumatoid arthritis, psoriatic arthritis, or SLE; bursitis may be the presenting complaint of a flare, often with rheumatoid nodules at the olecranon.
— Fever, immunosuppression, IVDU, prior bursal procedure, overlying ulcer, anticoagulation, and ability to fully flex/extend the joint without pain.
Step 3 management: In the ambulatory clinic, the single most decision-changing history element is the presence of fever plus an overlying skin breach — this combination should push you toward urgent aspiration with Gram stain, crystal analysis, and culture before empiric antibiotics, rather than a trial of NSAIDs and compression. Document immunosuppression and anticoagulation status explicitly to support disposition decisions.
— Olecranon bursitis: egg-shaped, well-demarcated swelling over the tip of the olecranon; skin may show callus, abrasion, or psoriatic plaque.
— Prepatellar bursitis: dome-shaped swelling anterior to the patella, not in the suprapatellar pouch or medial joint line.
— Look for rheumatoid nodules, gouty tophi (chalky white), and overlying ulcers or cellulitis margins (outline with marker for serial exam).
— Fluctuant, tender mass that is superficial and mobile over bone.
— Warmth and erythema raise concern for septic or crystal bursitis; cool, painless swelling suggests chronic aseptic.
— Bursitis: passive ROM of the elbow or knee is preserved and relatively painless, with discomfort only at end-range when the inflamed bursa is compressed.
— Septic arthritis: ROM is severely limited and painful even with small arcs; the joint is held in a position of maximum capsular volume (elbow ~70° flexion; knee ~15–30° flexion).
— Document distal pulses, capillary refill, and ulnar nerve function at the elbow (bursal mass can compress the ulnar groove → tingling in digits 4–5).
— Vitals matter: tachycardia, fever >38°C, or hypotension in a patient with bursitis suggests bacteremia or progression to septic arthritis or necrotizing soft-tissue infection.
— Screen for SIRS/qSOFA criteria in any febrile bursitis; lactate and blood cultures if two or more criteria are met.
Key distinction: Preserved, comfortable passive ROM = bursitis until proven otherwise; severe pain on micro-arc passive ROM = septic arthritis until proven otherwise. This bedside maneuver outperforms labs in initial triage and is heavily tested on Step 3 because it directly changes whether you tap a bursa in clinic or send the patient for emergent joint arthrocentesis and orthopedic consult.
— CBC with differential — leukocytosis with left shift supports infection but is neither sensitive nor specific.
— CRP and ESR — elevated in septic, crystal, and inflammatory bursitis; useful as a trend rather than a single value.
— Serum uric acid — supportive but not diagnostic; can be normal during acute gout.
— Blood glucose / HbA1c — uncontrolled diabetes is a major septic risk factor and modifies disposition.
— Blood cultures × 2 if febrile or systemically ill before antibiotics.
— Coagulation panel/INR if anticoagulated and aspiration is planned.
— Indicated whenever septic bursitis is plausible (erythema, warmth, fever, immunocompromise, or diagnostic uncertainty).
— Send fluid for cell count with differential, Gram stain, aerobic/anaerobic culture, and crystal analysis under polarized light.
— Interpretation cutoffs (less stringent than joint fluid):
– WBC <500/µL → likely traumatic/chronic.
– 500–10,000/µL with mononuclear predominance → inflammatory.
– >10,000/µL with PMN predominance → presumed septic until cultures return; >50,000 highly suggestive.
— Negatively birefringent needle-shaped crystals = monosodium urate (gout); positively birefringent rhomboid = CPPD.
— Plain radiographs if trauma, suspected fracture, foreign body, or chronic refractory case — may show olecranon spurs, soft-tissue swelling, or intraosseous gas in deep infection.
— ECG not routinely indicated unless preoperative for I&D under sedation.
CCS pearl: Order "aspirate bursa, send fluid: cell count, Gram stain, culture, crystals" as a bundled action; on CCS, splitting these into separate orders wastes simulated clock time and may delay antibiotics in the septic scenario.
— First-line advanced imaging for ambiguous cases.
— Differentiates bursal fluid (anechoic/hypoechoic collection superficial to bone) from cellulitis (cobblestoning without discrete collection), abscess (loculated with posterior enhancement), and joint effusion (deep to capsule).
— Guides aspiration in obese patients, loculated collections, or when landmarks are obscured by edema.
— Reserved for chronic, recurrent, or refractory bursitis; suspected osteomyelitis of the olecranon or patella; or concern for deep extension/abscess.
— Findings: T2-hyperintense bursal fluid, wall thickening with rim enhancement after gadolinium, and adjacent bone marrow edema if osteomyelitis is present.
— If physical exam suggests concurrent septic arthritis (severely painful ROM, joint-line effusion), perform joint aspiration through uninvolved skin to avoid seeding the joint from an overlying infected bursa.
— Synovial WBC >50,000/µL with >75% PMNs supports septic arthritis.
— If initial cultures are negative but clinical suspicion remains, consider mycobacterial and fungal cultures in immunocompromised patients, gardeners (Sporothrix), and those with chronic ulceration or aquatic exposure (Mycobacterium marinum).
— Holding antibiotics for 24–48 hours before aspiration, when safe, improves culture yield.
Board pearl: When in doubt between cellulitis and septic bursitis, bedside ultrasound is the highest-yield, lowest-cost next step on Step 3 — visualizing a discrete fluid collection mandates aspiration, while pure cobblestoning supports treating as cellulitis without tapping. This decision tree is a recurring vignette pattern.
— 1. Aseptic, chronic, non-traumatic (most common): no fever, no erythema, intact skin, low-risk host.
— 2. Aseptic, acute traumatic/hemorrhagic: recent blow, tense painful swelling, no infection signs.
— 3. Septic bursitis: erythema/warmth/fever, skin breach, or high-risk host; fluid PMN-predominant or Gram-positive.
— 4. Crystal-induced or inflammatory: known gout/RA, crystals on polarized microscopy.
— Chronic aseptic: activity modification, padded protective sleeves/kneepads, NSAIDs if not contraindicated, ice 15–20 min several times daily, and avoidance of repetitive pressure. Aspiration is not routinely required and increases iatrogenic infection risk.
— Acute traumatic/hemorrhagic: RICE (rest, ice, compression, elevation), NSAIDs, compressive wrap; aspirate only if tense, painful, or impairing function; avoid intrabursal steroids in the acute setting.
— Septic: aspirate, send labs, start empiric antibiotics covering S. aureus (including MRSA when appropriate), arrange close follow-up or admit based on severity (see chunk 12).
— Crystal/inflammatory: NSAIDs first-line; colchicine or short oral prednisone taper if NSAIDs contraindicated; intrabursal steroid only after definitively excluding infection by negative Gram stain/culture.
— Anticoagulation, CKD, peptic ulcer disease, and CHF modify NSAID choice and dosing.
— Occupation should drive ergonomic counseling — return-to-work with kneepads or elbow pads is part of definitive management.
Step 3 management: The default initial outpatient pathway for non-septic bursitis is conservative care without aspiration; aspiration is reserved for diagnostic uncertainty, suspected infection, or symptomatic tense effusion — a frequent distractor on Step 3 is "routinely aspirate and inject steroids," which is incorrect.
— Ibuprofen 600–800 mg PO TID with food, or naproxen 500 mg PO BID, for 7–14 days.
— Add a PPI in patients ≥60, on anticoagulants/antiplatelets, or with PUD history.
— Avoid if CKD stage ≥3, decompensated CHF, or active GI bleeding — use topical diclofenac 1% gel or acetaminophen instead.
— Cephalexin 500 mg PO QID or dicloxacillin 500 mg PO QID for 14–21 days, with reassessment at 48–72 hours.
— TMP-SMX DS 1–2 tabs PO BID, doxycycline 100 mg PO BID, or clindamycin 300–450 mg PO QID.
— Linezolid is an alternative but expensive; reserve for failures.
— IV vancomycin (15–20 mg/kg q8–12h, target AUC 400–600) until culture data; de-escalate to cefazolin or nafcillin for MSSA.
— Duration: typically 2–3 weeks total (IV → oral step-down once afebrile and improving).
— Acute gout: NSAIDs, colchicine 1.2 mg PO then 0.6 mg in 1 hour, or prednisone 30–40 mg/day taper over 7–10 days.
— Avoid initiating allopurinol during the acute flare; if already on it, do not stop.
— Triamcinolone 10–40 mg can reduce recurrence in chronic aseptic olecranon bursitis but carries risk of infection, skin atrophy, and chronic sinus tract; many experts avoid it, especially in prepatellar bursitis due to the thin overlying skin.
Board pearl: TMP-SMX provides MRSA coverage but does not reliably cover beta-hemolytic streptococci for cellulitis — when septic bursitis overlies frank cellulitis, pair TMP-SMX with cephalexin or use clindamycin monotherapy.
— Sterile prep, lidocaine local anesthesia, 18–20-gauge needle entering through healthy, uninvolved skin at the lateral aspect to avoid creating a chronic sinus tract over the bony prominence.
— For olecranon: approach from the lateral side with elbow flexed ~45°.
— For prepatellar: lateral approach with knee in slight flexion.
— Aspirate to dryness; apply compressive dressing.
— Diagnostic uncertainty (rule out infection or crystals).
— Tense, painful effusion limiting function.
— Suspected septic bursitis (always before antibiotics if feasible).
— Overlying cellulitis without a clean entry point (risk of seeding) — use ultrasound guidance or treat empirically and reassess.
— Uncorrected coagulopathy (INR >3, platelets <50k).
— Indicated for: failed medical therapy, loculated/thick purulence, recurrent septic bursitis, chronic refractory aseptic bursitis with disabling symptoms, sinus tract formation, or suspected osteomyelitis.
— Open or endoscopic bursectomy is the definitive procedure for chronic refractory disease; performed by orthopedics.
— Compressive wrap 48–72 hours, immobilization in functional position briefly, then early ROM to prevent stiffness.
— Wound checks at 48–72 hours; warn patients about persistent drainage, which may indicate fistula.
— Only after infection definitively excluded; informed consent should include risks of skin atrophy, depigmentation, infection (up to 10%), and tendon weakening.
CCS pearl: On a CCS case of suspected septic olecranon bursitis, the correct sequence is: aspirate bursa → send fluid studies → start empiric antibiotics → arrange 48–72 hour follow-up; advancing the simulated clock without scheduling that follow-up will cost points.
— Higher baseline risk of septic bursitis due to thinner skin, comorbid diabetes, and chronic steroid or DMARD use.
— Atypical presentations: minimal fever, blunted leukocytosis, and confusion as the dominant systemic sign — have a low threshold to aspirate.
— NSAID caution: increased risk of GI bleeding, AKI, CHF exacerbation, and drug interactions (warfarin, SSRIs, ACEi); prefer topical NSAIDs or short-course acetaminophen.
— Falls risk assessment before prescribing colchicine or sedating analgesics.
— Avoid systemic NSAIDs when eGFR <30; use cautiously between 30–60.
— Colchicine requires dose reduction in CKD (e.g., 0.3 mg/day if eGFR <30) and is contraindicated with strong CYP3A4/P-gp inhibitors (clarithromycin, diltiazem) due to risk of severe myopathy and pancytopenia.
— Vancomycin dosing by AUC-guided pharmacy protocol; trough monitoring in dialysis patients.
— TMP-SMX can cause hyperkalemia and AKI in CKD; check K+ and creatinine at 5–7 days.
— Dialysis access (AV fistula) in the same limb as an infected olecranon bursa raises risk of bacteremia and endocarditis — involve nephrology early.
— Avoid high-dose acetaminophen (>2 g/day) in cirrhosis; avoid NSAIDs in advanced cirrhosis due to bleeding, ascites worsening, and hepatorenal risk.
— Adjust clindamycin and consider drug-induced liver injury risk with prolonged antibiotic courses.
— Corticosteroids may worsen hepatic encephalopathy and infection risk in decompensated liver disease.
Step 3 management: In an elderly diabetic on warfarin with new prepatellar swelling and erythema, do not simply prescribe NSAIDs and reassess — the correct pathway is INR check, ultrasound-guided aspiration with careful hemostasis, fluid studies, empiric MRSA-active oral antibiotic, and 48-hour follow-up.
— Bursitis itself is uncommon in pregnancy but can occur in healthcare workers and those with knee-loading activities.
— Avoid NSAIDs after 20 weeks (risk of fetal renal dysfunction and oligohydramnios) and especially after 30 weeks (premature closure of ductus arteriosus).
— Preferred analgesia: acetaminophen, ice, rest, padding.
— Safe antibiotics for septic bursitis: cephalexin, dicloxacillin, clindamycin; avoid doxycycline (teratogenic, tooth staining) and TMP-SMX in first trimester (neural tube defects) and near term (kernicterus risk).
— Imaging: ultrasound preferred; MRI without gadolinium acceptable if needed.
— Less common than in adults; consider in athletes (wrestling, basketball) and kneeling activities.
— Septic bursitis in children is more often hematogenous and may overlap with osteomyelitis; lower threshold to image and consult pediatric orthopedics/ID.
— Common organisms: S. aureus (including MRSA), group A strep, and Kingella kingae in young children.
— Antibiotic choices weight-based: cephalexin 25–50 mg/kg/day divided, clindamycin if MRSA risk; avoid fluoroquinolones and tetracyclines <8 years.
— Wrestlers and judo athletes have high rates of olecranon bursitis from mat friction; counsel on protective sleeves and skin hygiene to prevent MRSA outbreaks.
— Return-to-play after septic bursitis: only after completion of antibiotics, resolution of swelling, full painless ROM, and skin integrity.
— Carpet layers, tilers, gardeners, and roofers — prepatellar disease is recognized as occupational and may qualify for workers' compensation; document mechanism and exposures.
— Recommend certified kneepads with gel padding and scheduled position changes.
Board pearl: A pregnant patient at 32 weeks with prepatellar bursitis should receive acetaminophen and ice, not ibuprofen — late-pregnancy NSAID exposure is a high-yield Step 3 safety question that links musculoskeletal management to obstetric pharmacology.
— Chronic recurrent bursitis with thickened, fibrotic bursal wall — common after repeated trauma or inadequate treatment.
— Sinus tract / chronic drainage fistula — often iatrogenic after aspiration through inflamed skin; difficult to heal and may require bursectomy.
— Skin necrosis or atrophy — after intrabursal corticosteroid injection or pressure on tense bursa.
— Superinfection of an aseptic bursa following aspiration (1–10% risk depending on technique and host).
— Cellulitis extending from septic bursitis into adjacent soft tissue.
— Septic arthritis — particularly if aspiration crosses an infected bursa into the joint capsule; rare but devastating, requiring urgent washout.
— Osteomyelitis of the olecranon or patella, especially in diabetics and after recurrent infection; suggested by persistent drainage, exposed bone, or MRI marrow edema.
— Necrotizing fasciitis — rare but lethal; suspect with pain out of proportion, rapidly spreading erythema, bullae, crepitus, systemic toxicity.
— Bacteremia and sepsis, particularly in diabetics, dialysis patients, and IVDU; risk of endocarditis, especially with S. aureus.
— Metastatic infection: vertebral osteomyelitis, epidural abscess, septic pulmonary emboli in right-sided endocarditis.
— Large olecranon bursae may compress the ulnar nerve in the cubital tunnel, producing paresthesias in the ring/small fingers and intrinsic hand weakness.
— Persistent stiffness, occupational disability, and impaired kneeling/leaning tolerance.
— Post-bursectomy: small risk of wound dehiscence, recurrent bursa formation, and hypertrophic scarring.
Key distinction: Persistent drainage from an olecranon or prepatellar wound after antibiotics should not be dismissed as "slow healing" — it is a sentinel sign of chronic sinus tract or underlying osteomyelitis and warrants MRI plus orthopedic referral, not another antibiotic course.
— Aseptic bursitis of any cause.
— Mild-to-moderate septic bursitis in a reliable, immunocompetent patient with no systemic toxicity, able to return for 48–72 hour follow-up.
— Systemic signs: fever >38.5°C, tachycardia, hypotension, or meeting SIRS/sepsis criteria.
— Significant comorbidities: poorly controlled diabetes, ESRD on dialysis, immunosuppression, IVDU, cirrhosis.
— Failure of 48–72 hours of appropriate outpatient oral therapy (worsening erythema, persistent fever, increasing pain).
— Inability to tolerate or adhere to oral therapy.
— Suspicion of contiguous septic arthritis, osteomyelitis, or deep abscess.
— Extensive overlying cellulitis or signs of necrotizing infection.
— Septic shock requiring vasopressors, lactate >4, multi-organ dysfunction.
— Necrotizing soft-tissue infection — surgical emergency, broad-spectrum antibiotics (vancomycin + piperacillin-tazobactam + clindamycin for toxin suppression), urgent OR.
— Orthopedic surgery: failed aspiration/antibiotics, suspected osteomyelitis, need for bursectomy, suspected septic arthritis, sinus tract.
— Infectious disease: atypical organisms, immunocompromised host, recurrent septic bursitis, prosthetic joint nearby.
— Rheumatology: recurrent crystal or inflammatory bursitis suggesting underlying systemic disease.
— Endocrinology/diabetes care: for glycemic optimization in recurrent infections.
— Clearly note return precautions: spreading redness, fever, increased pain, drainage, numbness, or inability to bend the joint.
— Provide written follow-up appointment within 48–72 hours.
CCS pearl: In a CCS scenario where simulated vitals show T 39°C and HR 115 in a diabetic with septic olecranon bursitis, move location to inpatient ward, order IV vancomycin, blood cultures × 2, lactate, and ortho consult — failing to change location is a common point-losing error.
— Deep, severely painful effusion; micro-arc passive ROM is exquisitely painful unlike bursitis.
— Synovial fluid WBC >50,000 with PMN predominance; gonococcal arthritis in sexually active young adults.
— Urgent arthrocentesis, IV antibiotics, and surgical washout if confirmed.
— Diffuse, non-fluctuant erythema and warmth without discrete fluid collection.
— No needle aspiration unless abscess suspected; treat empirically for streptococci ± MRSA.
— Discrete, tender fluctuant collection but typically more loculated and not anatomically tied to the bursa; requires I&D rather than simple aspiration.
— Crystal deposits within and around the bursa; chronic firm nodules with chalky discharge.
— Polarized microscopy clinches diagnosis; manage flare then initiate urate-lowering therapy after resolution.
— Less common than gout in these locations; positively birefringent rhomboid crystals; associated with hemochromatosis, hyperparathyroidism, hypomagnesemia, hypophosphatasia.
— Bilateral olecranon involvement, firm subcutaneous nodules, seropositive RA (RF/anti-CCP).
— Treat underlying RA; intrabursal therapy only after excluding infection.
— Bursitis: anterior swelling, flexion to 90° usually possible, joint line non-tender.
— Septic arthritis: globally swollen knee with effusion in suprapatellar pouch, severely restricted ROM.
Board pearl: When a vignette says "patient can walk and bend the knee to 90° but has anterior swelling," the answer is prepatellar bursitis, not septic knee arthritis — the preserved functional ROM is the discriminator that defines management (aspirate bursa, not joint).
— Rheumatoid nodules — firm, non-fluctuant, non-tender; associated with seropositive RA; biopsy if atypical.
— Gouty tophi — chalky, firm, may ulcerate releasing white material; uric acid usually elevated.
— Lipoma or epidermoid cyst — soft, mobile, chronic, painless, no inflammation.
— Synovial sarcoma or soft-tissue tumor — rare but consider with atypical, firm, fixed, or rapidly growing masses; image with MRI and biopsy.
— Triceps tendinopathy or partial tear — pain with resisted elbow extension, not a discrete fluid collection.
— Olecranon stress fracture — point bony tenderness, pain with extension; tender on palpation of bone, not over the bursa.
— Patellar tendinopathy ("jumper's knee") — pain at the inferior pole of patella with activity; no fluid collection.
— Patellar fracture — direct trauma, inability to extend knee, palpable defect.
— Quadriceps tendon rupture — inability to actively extend, palpable suprapatellar gap; surgical emergency.
— Knee joint effusion — fluid in suprapatellar pouch and joint line, not anterior to the patella; positive ballottement.
— Pes anserine bursitis — medial knee pain ~5 cm below joint line, common in overweight middle-aged women with osteoarthritis.
— Baker's cyst — posterior knee swelling, may rupture mimicking DVT.
— Erythema nodosum, panniculitis — bilateral, multifocal nodules; consider sarcoid, IBD, infections.
— Cutaneous metastases or lymphoma — rare but consider in elderly with non-resolving "bursitis."
— Calcific tendinitis — peri-articular calcifications on X-ray.
Key distinction: Bursa swelling sits in front of the patella; joint effusion sits around and above it. A positive ballottable patella sign (tapping the patella against the femur with fluid present) indicates intra-articular effusion, not bursitis — this physical exam differentiation is a classic Step 3 tested point.
— Kneepads (gel-padded, certified) for occupational kneelers — carpet layers, tilers, plumbers, gardeners, clergy.
— Elbow pads/sleeves for students, dart players, wrestlers, and patients who lean on hard surfaces; recommend padded chair armrests.
— Frequent position changes — avoid sustained pressure >20 minutes.
— Skin hygiene: keep skin intact, treat eczema/psoriasis aggressively, daily inspection in diabetics.
— Complete prescribed antibiotic course (typically 14–21 days; longer if osteomyelitis).
— PPI if NSAIDs continued >2 weeks or in high-risk hosts.
— Update tetanus if last booster >5 years and skin was breached.
— Address MRSA decolonization (nasal mupirocin × 5 days, chlorhexidine body wash) in recurrent or household-clustered cases.
— Diabetes: target HbA1c per individualized goal (often <7–8%); recurrent skin infections are a marker of poor control.
— Gout: initiate allopurinol (start low, 100 mg/day, titrate to serum urate <6 mg/dL; <5 if tophi) after acute flare resolves, with concurrent NSAID or colchicine prophylaxis for 3–6 months. Check HLA-B*5801 in Asian (Han Chinese, Korean, Thai) and African ancestry patients before allopurinol.
— RA: ensure DMARD optimization with rheumatology.
— Weight loss for prepatellar disease and gout reduction.
— Limit alcohol, especially beer; reduce high-purine foods in gout.
— Smoking cessation — impairs wound healing after bursectomy.
— Document occupational link; coordinate temporary duty modification with employer.
Step 3 management: For a patient with recurrent gouty olecranon bursitis and serum urate 9 mg/dL, the long-term plan after the acute flare is allopurinol with anti-inflammatory prophylaxis for 3–6 months, dietary counseling, and follow-up urate every 2–4 weeks until target <6 — not indefinite NSAIDs alone.
— Septic bursitis (outpatient): in-person or telehealth visit at 48–72 hours to assess clinical response; weekly until resolution; final visit at end of antibiotic course.
— Aseptic bursitis: 2–4 weeks to assess response; sooner if symptoms worsen.
— Post-bursectomy: wound check at 7–10 days, suture removal, then 4–6 weeks for ROM assessment.
— Clinical: bursal size (measure and document), overlying erythema (outlined), pain score, ROM, function.
— Labs: trending CRP if initially elevated; CBC and renal/hepatic panels for prolonged antibiotics.
— Drug-specific: vancomycin levels/AUC, TMP-SMX (K+, Cr at day 5–7), NSAIDs (BP, Cr, Hgb), allopurinol (LFTs, CBC, urate).
— Early gentle ROM to prevent stiffness, especially after aspiration or surgery.
— Quadriceps strengthening for prepatellar disease; triceps and grip strengthening for olecranon.
— Physical therapy referral if persistent stiffness or functional limitations at 2–4 weeks.
— Recurrence rate is significant without ergonomic modification — emphasize pads and behavior change.
— Avoid resting weight on affected area for at least 2–4 weeks after symptom resolution.
— Return precautions: spreading erythema, fever, new drainage, severe pain, neurologic symptoms.
— Update tetanus, ensure pneumococcal and influenza vaccines current in diabetics and immunocompromised.
— Reinforce skin care in eczema/psoriasis with dermatology coordination.
— Light duty until pain-free with kneepad/elbow pad; full duty after full ROM and skin integrity.
Board pearl: A 48–72 hour reassessment after starting outpatient antibiotics for septic bursitis is the standard of care; absence of clinical improvement at that visit warrants re-aspiration, broadened coverage (MRSA), and consideration of inpatient transition — a frequent Step 3 management progression item.
— Document discussion of benefits (diagnostic clarity, symptom relief), risks (infection up to ~10%, bleeding, skin atrophy, sinus tract, recurrence, vasovagal reaction), and alternatives (conservative management, surgical bursectomy).
— Use teach-back to confirm understanding, especially before steroid injection where adverse cosmetic and infectious risks are real.
— High-risk handoffs: ED-to-clinic, clinic-to-urgent care, and inpatient-to-home transitions after septic bursitis. Ensure clear communication of pending cultures, antibiotic duration, follow-up timing, and contingency plan.
— Implement a closed-loop notification system for culture results, especially when MRSA or unusual organisms are identified after discharge — patients should be reachable and antibiotic adjustments documented.
— Suspected work-related prepatellar or olecranon bursitis should be reported per state workers' compensation rules; document mechanism, exposures, and recommended accommodations.
— IV drug use identified during workup triggers screening for HIV, HBV, HCV with counseling; offer harm reduction (naloxone, syringe service referral, MOUD).
— Avoid empiric vancomycin in low-risk outpatients; use narrow-spectrum agents when MSSA confirmed; complete duration but no longer than indicated.
— Document indication, organism, and planned duration in the chart.
— Confirm allergies and prior antibiotic reactions before prescribing.
— Reconcile medications carefully: NSAID + ACEi + diuretic ("triple whammy") increases AKI; colchicine + clarithromycin or statins risks myopathy/rhabdomyolysis.
— Occupational bursitis disproportionately affects manual laborers; ensure access to kneepads, language-appropriate counseling, and follow-up regardless of insurance status.
Step 3 management: When a patient with septic bursitis is discharged with pending blood cultures, the responsible physician must establish an explicit follow-up mechanism (callback, patient portal, scheduled visit within 48–72 hours) — failure to do so is a documented patient-safety gap and a tested professionalism scenario.
— "Student's elbow," "miner's elbow," "darts player's elbow" → olecranon bursitis.
— "Housemaid's knee," "carpet-layer's knee," "clergyman's knee," "nun's knee" → prepatellar bursitis.
— "Clergyman's knee" is sometimes used for infrapatellar bursitis, just below the patella.
— S. aureus causes ~80–90% of septic bursitis; streptococci a distant second.
— Gardeners → Sporothrix schenckii (rose-thorn injury → nodular lymphangitis).
— Aquarium/fish handlers → Mycobacterium marinum.
— IVDU → polymicrobial, MRSA, Pseudomonas.
— Septic: WBC >10,000 with PMN >50%, Gram stain positive in ~50%.
— Crystal: WBC 1,000–40,000; crystals visible on polarized light.
— Hemorrhagic: grossly bloody, low WBC, no organisms.
— Colchicine + clarithromycin/diltiazem → toxicity.
— Allopurinol + azathioprine/6-MP → marrow suppression (reduce thiopurine 75%).
— NSAIDs + lithium → lithium toxicity.
— TMP-SMX + warfarin → INR elevation.
— Ultrasound = first-line for fluid collections.
— MRI for osteomyelitis or deep extension.
— X-ray for trauma/foreign body/chronic disease.
— Always aspirate before antibiotics if safe.
— Approach through healthy skin lateral to bony prominence.
— Document mechanism for workers' compensation eligibility.
Board pearl: Negatively birefringent, needle-shaped crystals = gout (MSU); positively birefringent, rhomboid crystals = CPPD (pseudogout) — and "Positive = Pseudogout = Parallel yellow only in CPPD" is the high-yield memory aid that appears repeatedly across Step 2 and Step 3.
— "A 45-year-old plumber has a 3-day history of swelling, warmth, and erythema over the anterior knee. Temperature 38.3°C. He can flex the knee to 100° with mild discomfort. Skin shows a small abrasion."
— Best next step: aspirate the bursa and send fluid for Gram stain, culture, cell count, and crystals; start empiric cephalexin (or TMP-SMX/clindamycin if MRSA risk) after aspiration.
— Patient with anterior knee swelling but full painless ROM → prepatellar bursitis, not septic arthritis. Distractor: "urgent joint aspiration" (wrong target).
— Tense, bloody-appearing olecranon swelling after minor trauma in a warfarin user. Best step: check INR, hold/reverse if elevated, then drain only if symptomatic; treat conservatively otherwise.
— Chronic tophi at olecranon, recent flare. After flare resolution, initiate allopurinol with colchicine prophylaxis, target urate <6 mg/dL.
— 32-week-pregnant nurse with prepatellar swelling, no infection signs. Best initial therapy: acetaminophen, ice, rest, padding; avoid NSAIDs.
— 48 hours after starting cephalexin, the patient has worsening erythema and persistent fever. Next step: re-aspirate, broaden to MRSA coverage (vancomycin), admit, and consult orthopedics.
— Gardener with nodular lymphangitic spread from elbow → itraconazole.
— Culture grows MRSA after ED discharge on cephalexin. Correct action: contact patient, change to TMP-SMX or doxycycline, ensure follow-up.
Key distinction: Step 3 stems frequently embed comorbidity-driven drug choice (CKD → avoid NSAIDs; pregnancy → avoid doxycycline/late NSAIDs; warfarin → check INR first) rather than testing the diagnosis itself — read for the modifier before selecting therapy.
— Preserved passive ROM distinguishes bursitis from septic arthritis at the bedside — the single most decision-changing physical exam finding.
— S. aureus causes ≥80% of septic bursitis; first-line empiric outpatient therapy is cephalexin or dicloxacillin, switching to TMP-SMX, doxycycline, or clindamycin when MRSA risk is present, for 14–21 days with 48–72 hour reassessment.
— Aspirate before antibiotics whenever feasible, entering through healthy skin lateral to the bony prominence; send fluid for cell count, Gram stain, culture, and crystals.
— Aseptic bursitis is managed conservatively with kneepads/elbow pads, NSAIDs (with renal/GI/pregnancy considerations), ice, and activity modification; routine aspiration and intrabursal steroid injection are not first-line and carry risks of infection, atrophy, and sinus tracts.
— Long-term prevention centers on ergonomic protection, treatment of crystal disease (allopurinol to urate <6 after flare resolves), glycemic control in diabetics, and explicit follow-up planning to close the loop on pending cultures.
Board pearl: If you remember only one thing, remember the ROM rule: bursitis lets the joint move, septic arthritis does not — this single bedside maneuver triages the entire workup, drives the choice between bursal aspiration and emergent arthrocentesis, and is the most consistently rewarded reasoning step across Step 3 musculoskeletal vignettes.