STT arthrodesis versus proximal row carpectomy for Lichtman stage IIIB Kienböck's disease: first results of an ongoing observational study - Hohendorff, B; Mühldorfer-Fodor, M; Kalb, K; van Schoonhoven, J; Prommersberger, K J (Arch Orthop Trauma Surg, 2012)