Significant and Permanent loss of knee flexion or extension is a recognized and disabling complication of either operative procedures or trauma about the knee. We have experienced 3 cases of the postoperative ankylosis of the knee after the patella fracture, in which the range of motion of the knee was not satisfactory after the trial of the arthroscopic Iysis of adhesion with manipulation of the knee, so minimal arthrotomy, limited lateral arthrotomy combined with medial arthrotomy, were performed and revealed the satisfactory results.