Consistency of implantation of a total knee arthroplasty with a non-image-based navigation system: a case-control study of 235 cases compared with 235 conventionally implanted prostheses - Jenny, J Y; Clemens, U; Kohler, S; Kiefer, H; Konermann, W; Miehlke, R K (J Arthroplasty, 2005)