Fig. 5　Comparison of the operative scar after two different incisions

An 80-year-old woman underwent arthroplasty of her right knee using a mid-vastus approach via a midline incision, followed by the direct medial approach with a medial oblique incision on her left knee. Anteroposterior view in knee extension（A）. Distal view of the right（B）and left knee（C）in flexion. Maximum flexion is 115 degrees in the right（D）and 135 degrees in the left knee （E）. Proximal view of the right（F）and left knees（G）in flexion.