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The Meniscal "Pseudocyst"

A Clinical Sign of a Torn Meniscus

Australian Institute of Musculo-Skeletal Research, Sydney, New South Wales, Australia

* Address correspondence and reprint requests to Rhidian Morgan-Jones, FRCS, Consultant Orthopaedic Surgeon, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, United Kingdom

We report a study of 636 patients requiring knee surgery, all of whom underwent detailed preoperative assessment. Fifty-eight patients had a clinical sign of a lump on the joint line when the knee was examined at 45° of flexion, which has been thought to indicate a meniscal cyst. Of these 58 patients, however, only 30 patients had a meniscal cyst demonstrated at surgery. The remaining 28 patients had a meniscal tear without a cyst. In these 28 cases, the clinical sign of a lump protruding from the joint line was termed a "pseudocyst." This new clinical sign is important because of its frequency of occurrence and the complete correlation with meniscal tears requiring surgical intervention.