PURPOSE: To evaluate clinical outcome and functional result after cemented bipolar hemiarthroplasty of displaced neck fracture in parkinsonism patients. MATERIALS AND METHODS: 12 parkinsonism patients treated by cemented bipolar hemiarthroplasty of displaced femur neck fracture from August 1994 to October 2002 were evaluated. Posterolateral approach was performed. Preoperative and postoperative walking ability, activity of daily life and severity of parkinsonism were compared. The effects of parkinsonism on clinical outcome were analyzed retrospectively. RESULTS: The median difference of walking ability was 1 (p=0.001) and that of ADL scale was -3 (p=0.0005). There was no significant change in the severity of parkinsonism (p=0.5), and the severity and duration of parkinsonism were not correlated with postoperative functional status. 7 cases of voiding difficulty, 5 of temporary delirium, and 2 of temporary respiratory insufficiency were noted as general complications. 2 cases of dislocation and 1 of infection were noted as orthopaedic complications. CONCLUSION: In parkinsonism patient, walking ability was worsened, activity was more independent, but severity of parkinsonism was not changed after hemiarthroplasty of displaced femur neck fracture. Orthopaedic surgeons should bear in mind that functional outcome is poor and orthopaedic complication rate high in parkinsonism.