We studied the results in forty-three knees in thirty patients-three male and twenty seven femalewho had rheumatoid arthritis, osteoarthritis, traumatic arthritis and osteonecrosis in the knee and were treated by total knee joint replacement. The average age of the patients was 56.7 years. The results were anaysed after follow-ups ranging from one year to three years and seven months, average being 23.6 months. The assessment was made upon the knee rating system of the Hospital for Special Surgery; the results were excellent in 29 knees, good in 12, fair in one and poor in one. The improvement of the flexion contractures was significant (postoperative average 1.7 degrees compared with preoperative average 20.1 degrees). The postoperative active flexion ranged from 70 degrees to 140 degrees (mean 110.2 degrees). One knee had a deep wound infection. The radiological loosening demonstrated in three cases, two of them had incomplete, nonprogressive radiolucent line, being less than one millimeter in width in the tibial component, one who had a deep infection showed three millimeters radiolucent line.