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Neumann, M; Cui, Q; Siebenrock, KA; Beck, M (2009). Impingement-free hip motion: the 'normal' angle alpha after osteochondroplasty. Clinical orthopaedics and related research, 467(3), pp. 699-703. Heidelberg: Springer-Verlag 10.1007/s11999-008-0616-6