Emergency arthroscopic irrigation, synovectomy and debridement for native joint pyogenic arthritis | advanced
Surgical Imaging
The trap: Thinking that 48-72 hours of symptoms is still acceptable for elective scheduling.
The fix: Bacterial proteases (staphylococcal and streptococcal) degrade cartilage proteoglycans within 6-12 hours. Irreversible chondrocyte death begins by 24 hours. Every hour of delay increases the risk of secondary osteoarthritis by approximately 5-7 percent. Treat as a true surgical emergency — aspiration and washout within 6-12 hours of presentation.
Location: The paediatric hip has a thick capsule, small joint volume, and the medial femoral circumflex artery lies within the surgical field.
Risk: Arthroscopic portals cannot reliably decompress the deep acetabular fossa or protect the blood supply to the femoral head. Standard teaching (and registry data) mandates open anterior arthrotomy (Smith-Petersen or Watson-Jones approach) for all confirmed or strongly suspected paediatric hip septic arthritis.
Location: Infection frequently tracks into the subacromial bursa via the rotator interval or through full-thickness rotator cuff tears.
Risk: Failure to establish an additional lateral or anterolateral portal and perform subacromial bursectomy leaves residual infection; recurrence rate doubles when the bursa is not addressed.
Location: The posterior horn of the medial meniscus and posteromedial recess are common sites of loculated pus that standard anterior portals cannot reach.
Risk: Incomplete debridement occurs in up to 40 percent of knee washouts when posteromedial and posterolateral portals are omitted. Always establish these portals under direct vision with a spinal needle localisation technique.
Deception: Gout or pseudogout can produce identical clinical and laboratory findings (hot swollen joint, fever, elevated CRP, synovial WCC greater than 50,000).
Differentiation: Always send synovial fluid for crystal analysis under polarised light microscopy before or at the time of washout. Presence of negatively birefringent monosodium urate or positively birefringent calcium pyrophosphate crystals changes the diagnosis and avoids unnecessary prolonged antibiotics.
High-risk groups: Intravenous drug users, immunocompromised patients, recent penetrating trauma, or contiguous osteomyelitis.
Implication: Standard empiric regimens (vancomycin plus third-generation cephalosporin) may miss Gram-negative, anaerobic or fungal organisms. Add piperacillin-tazobactam or meropenem and request extended cultures (including fungal and mycobacterial) in these populations.
W.A.S.H.O.U.TWASHOUT — Arthroscopic Septic Arthritis Protocol
J.O.I.N.T.SJOINTS — Differential Portal Strategy by Joint
Surgical Indications
Absolute Indications
- Confirmed or strongly suspected septic arthritis on clinical, laboratory and imaging grounds (hot, swollen, painful joint with systemic features)
- Synovial fluid white cell count greater than 50,000 per microlitre with neutrophil predominance, or positive Gram stain
- Failed medical management of septic arthritis with persistent effusion or rising inflammatory markers after 48 hours of appropriate intravenous antibiotics
- Paediatric hip septic arthritis (open drainage is the standard of care)
Relative Indications
- Culture-negative septic arthritis with high clinical suspicion and failure to improve on empiric antibiotics
- Immunocompromised patient with atypical organisms or polymicrobial infection requiring aggressive source control
- Concomitant osteomyelitis requiring combined arthroscopic and open debridement
Contraindications
Absolute:
- Life-threatening sepsis requiring immediate stabilisation before any surgical intervention
- Inability to tolerate anaesthesia (rare — most patients can be managed under regional or general anaesthesia)
Relative:
- Very early presentation (less than 6 hours) with minimal effusion in a stable patient — may trial aspiration plus antibiotics first, but low threshold for washout
- Known crystal arthropathy with superimposed infection (still requires washout if bacterial infection confirmed)
Evidence for Timing and Technique
Timing of Surgical Intervention
- Multiple retrospective series and one systematic review demonstrate that delay from symptom onset to surgical washout of greater than 24 hours is associated with a 2- to 3-fold increase in permanent joint damage and secondary osteoarthritis.
- The 6-hour window from presentation to theatre is the practical target in most trauma units; aspiration should occur within 1-2 hours of arrival and washout within 6 hours.
Arthroscopic versus Open Washout
- For the knee, shoulder and ankle, arthroscopic washout achieves equivalent infection eradication rates to open arthrotomy while preserving range of motion and reducing morbidity.
- Hip septic arthritis in adults can be managed arthroscopically in selected cases with experienced surgeons, but open drainage remains the default in most centres and is mandatory in children.
- Repeat arthroscopic washout at 48-72 hours is required in 30-50 percent of cases and is associated with improved outcomes compared with a single washout.
Arthroscopic versus Open Washout — Evidence Summary
Key Evidence
Treatment of septic knee arthritis: comparison of arthroscopic debridement alone or combined with continuous closed irrigation-suction system
Septic arthritis of the hip - current concepts
Arthroscopic treatment of septic arthritis of the shoulder
Arthroscopic management of septic arthritis of the ankle
Clinical Decision Scenarios
Practise clinical reasoning and management decisions out loud
“A 68-year-old man with rheumatoid arthritis on methotrexate presents with a 36-hour history of a hot, swollen, painful right knee. He is febrile (38.9 degrees Celsius) and his CRP is 280 mg/L. How do you manage him?”
“A 4-year-old child presents with a 24-hour history of fever, limp, and inability to bear weight on the left leg. The hip is held in flexion, abduction and external rotation. Ultrasound shows a moderate effusion. What is your management?”
“A 52-year-old intravenous drug user presents with a hot, swollen shoulder and signs of systemic sepsis. Aspiration confirms Gram-negative rods on Gram stain. How do you approach the surgical management?”