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A LOCKED KNEE IN EXTENSION: A COMPLICATION OF A DEGENERATE KNEE WITH PATELLA ALTA

T. G. McWilliams, FRCS, Specialist Registrar in Orthopaedics; and M. S. Binns, MCh, FRCS, FRCS Orth, Consultant Orthopaedic Surgeon

Pontefract General Infirmary, Friarwood Lane, Pontefract, West Yorkshire WF8 1PL, UK.

Correspondence should be sent to Mr T. G. McWilliams at 2 Crawshaw Villa, Crawshaw Road, Pudsey, West Yorkshire LS28 7UB, UK.

We present a case of superior dislocation of the patella trapped by interlocked osteophytes. Unlike previous reports, in which the mechanism resulted from a blow to the inferior pole, it is postulated that increased load on the extensor mechanism, combined with patella alta and patellofemoral osteophytes, caused locking of the knee in extension.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General