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Koch, PP; Tannast, M; Fujita, H; Siebenrock, KA; Ganz, R (2008). Minimum ten year results of total hip arthroplasty with the acetabular reinforcement ring in avascular osteonecrosis. International orthopaedics, 32(2), pp. 173-9. Heidelberg: Springer-Verlag 10.1007/s00264-006-0303-8
Sadri, H; Pfander, G; Siebenrock, KA; Tannast, M; Koch, P; Fujita, H; Ballmer, P; Ganz, R (2008). Acetabular reinforcement ring in primary total hip arthroplasty: a minimum 10-year follow-up. Archives of orthopaedic and trauma surgery, 128(8), pp. 869-77. Berlin: Springer-Verlag 10.1007/s00402-008-0612-z
