抄録
Objective: The Bi-Surface knee prosthesis has a posterior stabilizing cam (unique ball and socket joint) in the med-posterior region of the femorotibial joint in an attempt to improve the range of movement. The objective of the present study was to evaluate the short-term results of total knee arthroplasty (TKA) using the Bi-Surf ace knee (KU 4)
Materials and Methods: From September 2002, Bi-Surf ace knee (KU 4) TKAs was performed in 122 knees of 98 patients. The 115 knees of 95 patients (14 males and 81 females) who could be followed for one year were enrolled in this study. The mean age at the operation was 72 years, and the mean follow-up period was 2.3 years. The 20 knees had rheumatoid arthritis (RA) and 95 knees had osteoarthritis (QA) . Clinical evaluation was based on the Japanese Orthopaedic Association (JOA) scores for RA and OA, and we also assessed the range of motion and radiographic results.
Results: The mean JOA score for RA increased from 47.4 preoperatively to 84.2 at the last follow-up. The mean JOA score for OA increased from 52.4 preoperatively to 79.4 at the last follow-up. The mean flexion range improved from 111.6° to 114.6° for OA, but decreased from 116° to 112° for RA. The mean extension range improved from 13.6° to 3.0° for Amend from 12.5° to 3° for RA.Radiographically, there were 23 knees with a radiolucent line, but no knees with sinking and noncontimuous radiolucent line.
Conclusions: Good clinical and radiographical results were obtained with Bi-Surf ace knee (KU 4) on the short-term follow-up.
