Range of Motion after Fixed Bearing Total Knee Arthroplasty

ABSTRACT

PURPOSE: The purpose of this study is to to analyze the range of flexion after total knee arthroplasty(TKA). MATERIALS AND METHODS: From January 1997 to June 2002, conventional fixed bearing TKA was car-ried out on 952 knees of 628 patients. The preoperative diagnosis was degenerative osteoarthritis in 816 knees and rheumatoid arthritis in 136 knees. The cruciate retaining(CR) prosthesis was used in 592 knees and the PCL substituting(PS) prosthesis in 360 knees. The range of flexion was measured using goniome-ter. In 40 knees, the lateral radiograph at full flexion position was obtained and the criterion validity(r) between the goniometric and radiographic measurement was analyzed. We measured and compared the range of flexion according to the preoperative diagnosis and type of prosthesis. RESULTS: Criterion validity(r) between goniometer and radiographic measurement was 0.92. At mini-mum one year follow-up after TKA, the average flexion was 127.8 +/-15.0 degree. There was no statistical sig-nificance in range of flexion between rheumatoid arthritis and osteoarthritis and between cruciate retain-ing and posterior stabilized prosthesis. CONCLUSION: The average flexion was 127.8 degree after TKA. 248 knees(26.1%) had ROM between 130 degree and 140 degree and 100 knees(10.5%) had 140 degree or more.