Open-wedge osteotomy using an internal plate fixator in patients with medial-compartment gonarthritis and varus malalignment: 3-year results with regard to preoperative arthroscopic and radiographic findings - Niemeyer, P; Schmal, H; Hauschild, O; von Heyden, J; Südkamp, N P; Köstler, W (Arthroscopy, 2010)