To evaluate short term results of 126 computer assisted unicompartmental knee arthroplasty (UKA) with ligament balancing.

Between September 2003 and November 2007 we performed 126 computer asssited surgery UKA Preservation. We using kinematic navigation Ci system. This is cemented system with mobile or fixed bearing. Our groups included 72 women and 54 men. Average age at surgery was 71,2 years. The indication for UKA include primary or postraumatic osteoarthritis limited to one compartment, a functional anterior cruciate ligament, no inflamatory disease. In all cases was only medial femorotibial osteoarthritis. Arthroscopic partial medial menisectomy was performed in 25 cases. Approach: medial parapatellar arthrotomy. Clinical evaluation was performed by Hospital for Special Surgery knee scoring system (HSS). Imaging: AP,lateral and stress X-rays.

The average HSS score was 57 point (range, 40–79 points) preoperatively and 94 points (range 62–100 points) postoperatively. 90% patients were classified as excellent or good using the HSS. The average range of motion before surgery: S 0-0-120 gr., 6 days after surgery S 0-0-110 gr. and 3 months after surgery S 0-0-125 gr.

No significant difference in maximum flexion was seen between the preoperative and postoperative values. There were no infection, fracture of tibia plateau, poor pain, or sign of patellar impingement.

UKA together with modern design, reproductible instrumentation and kinematic navigation can eliminate the previous cause of early failures, contralateral tibiofemorial degeneration and tibial loosening. The patient’s selection must be strict regarding (the ideal patient more than sixty years old, low Body Mass Index, low demand of physical activity). Kinematic navigation reduces the possibility of surgeon’s mistake, alignement of the femoral and tibial component, resection level, soft tissue balancing. It increases the accuracy of the comoponent position, especially in the side of the tibia. A continued long term follow-up is necessary to evaluate polyethylene wear after 10 years.

To evaluate first short term results of the 82 Articular Surface Replacements (ASR) of the hip joint with kinematic navigation.

Between March 2006 and March 2007 we performed 82 resurfacings of the hip. In all cases we used Articular Surface Replacement of the Hip joint (ASR-DePuy) with kinematic navigation (Ci system). Our group included 47 women and 35 men. Patients’ mean age at surgery was 68.2 years. The indication for resurfacing was just primary osteoarthritis. Clinical evaluations were conducted using the Harris Hip Scoring system. Imaging studies: AP, axial X-rays.

Patients were followed for an average 12 months postoperative (7–20 months). The average postoperative Harris Hip Total Score was 97%, and 98% of the patients were in the good to excellent range of 80–100 points. No patients were lost to follow-up. We noted a greater range of movement, faster postoperative rehabilitation and shorter time of hospitalization compared with traditional total hip arthroplasty. There were no cases of neurological complication, deep infection, wound dehiscence or dislocation. All X-rays refer correct position of femoral component in both projections. Our experiences with Articular Surface Replacement of the Hip Joint (ASR-DePuy) powered by Ci navigation system are good, but long term followup will be continued.

Articular Surface Replacement of the Hip Joint with modern design, reproductible instrumentation and kinematic navigation can eliminate the previous cause of early resurface failures and loosening. The patient selection must be strict regarding. The kinematic navigation define precise position of the components of ASR. A continued long term follow-up is necessary after minimum 10 years.