We reported a case which caused the tendon rupture of the patella in about one month after total knee replacement (TKR). The patient, a sixty-nine-year-old female, has been treated for Reumatoid Arthritis at our hospital. Pain of her right Knee had gradually increased and the apparent deformity of her right knee joint was recognized on X-ray, so that TKR of her right knee was performed. According to our schedule, the physical therapy was begun in two days after TKR. She felt pain at anterior portion of her right knee with crepitation in about four weeks after TKR, and couldn't extend her right knee. We found the high riding patella on X-ray and diagnosed as the tendon rupture of the patella. In about five weeks after TKR, the tendon repair was performed. Now, the patient walks with no complaints.
