Six Patients (8 limbs) with severe osteoarthritis of the knee were treated by tibial condyle valgus osteotomy (TCVO). The medial joint space of the knee had disappeared or Miklicz's line was seen to pass through the medial side from the medial edge of the tibia in these patients. The patients age ranged from 54 years to 81 years. The follow-up periods were from 2 years to 6 years. The average score of these patients (JOA score) improved from 45 points to 85 points after surgery. We concluded that symptoms improved due to the decrease in the load of the medial joint of knee was and the recovery of the stability of the knee joint by TCVO.
