抄録
We report a case of pes anserinus syndrome after unicompartmental knee arthroplasty (UKA). The patient, a 79-year-old woman, had undergone UKA on right side for osteoarthritis of the knee. Three weeks after the operation, she complained of snapping symptoms in the medial part of the right knee, which had not been evident before the operation. X-ray and CT examinations suggested that the problem had been elicited by popping of the semitendinosus and gracilis over osteophytes in the joint, which had not been sufficiently dissected during surgery. As conservative treatment for eight months after UKA failed to relieve the symptoms, resection of the osteophytes was undertaken. Postoperatively, the snapping symptoms disappeared and the patient currently remains symptom-free. This was a rare case of snapping knee caused by improvement of knee alignment and range of motion, and the presence of osteophytes that had not been problematic before UKA.
