Diagnostic Arthroscopy: When It Is Not Recommended

Contraindications and Low-Value Scenarios for Diagnostic Arthroscopy

Diagnostic arthroscopy is an invasive procedure with risks (infection, DVT, neurovascular injury, anesthesia). It should be reserved for cases where imaging is nondiagnostic and findings will change management.

Absolute/Relative Contraindications

• Active Infection: Septic arthritis, cellulitis over portal sites, systemic bacteremia—arthroscopy spreads infection.
• Uncontrolled Coagulopathy: INR >1.5, platelets <50k, therapeutic anticoagulation not held—hemarthrosis risk.
• Severe Ankylosis/Fibrosis: Joint space obliterated—cannot insert scope; open or imaging preferred.
• Severe Peripheral Neuropathy: Loss of protective sensation—risk of unrecognized intraoperative injury/Charcot-like deterioration.

Low Diagnostic Yield / Not Indicated

• Advanced Osteoarthritis (Kellgren-Lawrence 3–4): Imaging (X-ray, MRI) suffices; arthroscopy offers no benefit over nonoperative care (strong evidence: RCTs, Cochrane).
• Mechanical Symptoms with Clear MRI Findings: If MRI shows definitive meniscal tear/loose body and surgery is planned, proceed directly to therapeutic arthroscopy—diagnostic step redundant.
• Inflammatory Arthritis (RA, PsA) without Mechanical Block: Synovial biopsy rarely changes management; serology/imaging suffice.
• Pain without Mechanical Correlates: Central sensitization, referred pain—arthroscopy negative; risks outweigh benefits.
• Pediatric/Adolescent with Open Physes: Growth plate injury risk; MRI preferred.
• Patient Factors: High anesthetic risk (ASA IV–V), inability to comply with rehab, unrealistic expectations.

Appropriate Indications

• Mechanical symptoms (locking, catching, giving way) with equivocal/negative MRI.
• Suspected intra-articular loose body not seen on imaging.
• Synovial pathology (PVNS, synovial chondromatosis) needing histology.
• Diagnostic uncertainty in traumatic knee with hemarthrosis and inconclusive MRI.

Shared Decision-Making

Discuss: pretest probability, MRI accuracy for specific pathology, risks of scope vs. watchful waiting, patient values. Avoid "diagnostic scope" as default—it is a surgical procedure, not a test.