The posterior stabilized condylar prosthesis

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Abstract
In 1978, the total condylar prosthesis was modified by the addition of a tibial polyethylene spine and a transverse femoral cam to provide function of the posterior cruciate ligament. Patients (91, 118 arthroplasties) in whom this posterior stabilized condylar prosthesis was used have now been followed for 2-4 yr and their results were compared with the results of a similar study of patients in whom the original total condylar prosthesis was used. Functional assessments, including rating by The Hospital for Special Surgery, USA, knee score and of the range of motion, and radiographic evaluation of radiolucency and prosthesis placement were conducted. The knees with the posterior stabilized condylar prosthesis had 88% excellent, 9% good or fair, and 3% poor results. The knee score increased from 50 points preoperatively to 90 points postoperatively. The range of motion was signficantly increased from 95.degree. preoperatively to 115.degree. postoperatively. In all of these performance categories, the knees with a posterior stabilized condylar prosthesis rated higher than the knees with a total condylar prosthesis. An additional assessment of so-called normal function involving walking, stair-climbing and transfers showed that 76% of the patients with a posterior stabilized prosthesis and 22% of those with a total condylar prosthesis achieved normal function. Radiographic analysis of radiolucencies indicated no difference in pattern or frequency of occurrence in the 2 groups. There was an increased incidence of patellar complications in the group with a posterior stabilized prosthesis compared with the group with a total condylar prosthesis. The posterior stabilized condylar prosthesis was found to be a valuable adjunct to the total condylar prosthesis.

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