Sixteen cases (20 knees) of arthroplasties using the AMK prosthesis were clinically and radiographically evaluated. The mean age was 69 years in the osteoarthritic group (11 cases) and 58 years in the rheumatoid arthritic group (5 cases). The follow-up period ranged from 6 to 27 months (mean 19 months). Mean JOA knee rating score improved from 55 to 78 points in the OA group and from 51 to 73 in the RA group. Supine active flexion averaged 125° preoperatively and 111° postoperatively in the OA group, and 100° preoperatively and 105°postoperatively in the RA group. Radiolucencies, present in two cemented tibial components, were less than 1mm. Sclerotic lines were noticed at the bone-implant interface in five tibial components and one femoral component.
No cases of dislocation or subluxation of the patellofemoral joint were seen on the axial view.
