Approximately one third of patellar fractures require surgery and stellate and comminuted frachres of the patella has been increased. Operative treatment of the patella should be achieved to ensure continuity of the extensor mechanism, to preserve patellar function and reduce the incidence of complications related to articular fracture. Various techniques of internal fixation have been recommended for comminuted fracture of De patella, but there are some complications including loss of fragment position, reoperation, nonunion, loss of range of motion and loss of extensor mechanism strength. The evaluation of the clinical results in rigid fixation group which was made postoperative excercise from postoperative 2 weeks without cylinder cast application, was needed for the purpose whether or not to decrease those complications. We reported 46 cases of comminuted patellar fracture who were operated various methods with or without cylinder cast as postoperative care, from Jun 1990 to Dec 1995 at the department of orthopaedic surgery, Dongrae Bongsaeng hospital. In conculsions, rigid fixation as using Kirschner wires with modified anterior tension band and a circumferential wiring and early motion without cylinder cast for the comminuted patellar could be increased the fusion rate and range of motion and recovered function of the knee joint.