[Diagnosis and treatment of lateral crypta synovial crush syndrome of knee].

Lateral crypta synovial crush syndrome is often confused with lateral meniscus injury. Thirteen cases were reported in this paper. Of them, eleven cases had pain at the lateral of their knees which were flexed from twenty degrees to eighty degrees. One patient had knee pain in erect position and other one on walking. Local tenderness at lateral tibial plateau of knee existed in all cases and small nodule could be palpated at tenderness point in ten cases. Ten cases were examined by arthroscope. Synovial neoplasm or abnormal synovial fold was discovered in lateral crypta of knee which could be pushed into joint space at flexed twenty degrees to eighty degrees. After removing them, symptom disappeared. Three cases were cured by nodule block therapy. The block therapy of injection of prednisolonum was available for not only diagnosis, but also treatment. The indication of arthroscope is that effect of block therapye is unsatisfactory. That all cases occurred on the lateral side might be related to the diffierence in anotomic structure.