Objectives: We present the medium-term results of 453 primary, posterior cruciate retaining total knee replacements.

Methods: We used the Genesis I prosthesis to 453 knee-joints between 1993–2001. The patients included were 386 (67 bilateral) with age between 58–87 years (aver. 68,5 yrs). The diagnosis was osteoarthritis in 418 cases, rheumatoid arthritis in 21 cases, post-traumatic arthritis in 9 cases and osteoarhritis combined with rheumatoid disease in 5 cases. The knees flexion was ranged from 60° to 120° and the extension from 0° to 20°. In 423 cases a 5°–30° varus knee and in 31 cases a 5°–20° valgus knee was documented. The Genesis I knee prosthesis was used with cement, without patellar component implantation. The postoperative protocol included early weight bearing and follow up on the 3rd, 6th,12th month and every year.

Results: The follow up period was ranged from 2 to 10 years (aver. 5,2 yrs). Superficial infection was noted in 5 patients with a satisfactory outcome, pneumonic embolism in 3 (1 death) and deep venous thrombosis in 7 patients. The clinical and radiological assessment followed the Knee Society standards. Postoperatively the flexion was ranged from 80° to 130° with full extension of the knees. The preoperative varus & valgus deformity was totally corrected. No signs of mechanical loosening were documented. No revision surgery was needed. All the patients are happy with a good level of every day activity.

Conclusions: Our results eight years postoperatively are quite satisfactory (98%). All the prosthesis exhibit good behaviour and we believe that this type of prosthesis is a positive solution for the arthritis of the knee which needs surgical assessment.

Objectives: We present the level of biological fixation and the medium-term results of the hemispherical porous coated acetabular component.

Methods: A number of 299 acetabular components type Duraloc 100 were placed to equivalent primary hip arthroplasties. The patients were 273 (26 bilateral), 218 women and 55 men with age which ranged between 22–80 years (aver. 52 yrs). We performed a press-fit technique to stabilize the cup and an acetabulum under-reaming of 2 mm. The size of the components we used was ranged between 48–56 mm. 175 cups were combined with the Elite cemented stem (hybrid), whereas 124 cups with the AML cementless stem. In every case a 10° hooded polyethylene liner was required. The postoperative protocol included early partial weight bearing for six weeks, full weight bearing after three months and follow up on the 3rd, 6th, 12th month and every year. The clinical evaluation was performed with D’ Aubigne-Postel system while the radiological evaluation according to the AAOS standards. The follow up period was ranged from 2 to 9 years (aver. 5,2 years).

Results: During the last follow up no mechanical no radiological loosening was detected. The cup was definitely incorporated to the bone substrate.

Conclusions: Eight years postoperatively the results are perfect. We believe that the hemispherical porous coated, press-fit acetabular component exhibits a satisfactory biological behaviour in primary hip replacements.