Scorpio posterior-stabilized knee system: 5-year clinical and functional results.

One hundred three primary total knee arthroplasties using the Scorpio posterior-stabilized total knee system were studied. Clinical, functional, and radiographic assessments were performed preoperatively and at 7 weeks, 6 months, and annually postoperatively. Standard knee scoring systems were used for clinical and functional evaluation. Radiographic assessment was characterized according to standard zones. Presence of anterior knee pain and patellar clunk was also noted. Mean follow-up was 5.25 years. At latest postoperative follow-up, follow-up was 89%. Knee Society scores were 91.3 clinical and 73.0 functional. Mean range of motion increased from a mean preoperative level of 96.5 degrees to 124.5 degrees at latest-year follow-up. There were 4 reports of anterior knee pain. One femoral and 1 tibial radiolucency were found. The Scorpio posterior-stabilized design (Stryker Orthopaedics, Mahwah, NJ) showed favorable midterm results compared with other posterior-stabilized designs.