Seventy-nine primary total knee arthroplasties were performed in 64 patients using the Porous Coated Anatomic prosthesis (PCA, Howmedica, Rutherford, New Jersey). The series was reviewed retrospectively at an average of 50 months follow-up (minimum: 27 months). Kaplan Meyer Survivorship Analysis with Breslow statistic using revision as the end point predicted 89% survivorship of titoal implants, 92% of tibial components, and 94% of patellar components at 7 years post surgery. There was no significant difference in the survivorship between the cemented and the cementless prosthesis. Medial subsidence of the tibial components was the main problem encountered and was seen primarily in the cementless group. This was the cause of failure in the cementless tibial components and was likely due to varus positioning of the implant at the time of operation. The Hospital for Special Surgery knee score was 78 for the overall series and wsa not significantly different between the cemented and cementless groups.