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. 2009 Jul 30;468(1):182–190. doi: 10.1007/s11999-009-1005-5

Fig. 4.

Fig. 4

A box plot shows preoperative and postoperative alpha angles. An angle less than 50° was considered normal. Our aim was to achieve an impingement-free ROM of 110° flexion and an internal rotation and adduction greater than 20°, given the limitation that the resection had to be less than 20% of the femoral neck diameter to minimize the risk of an iatrogenic-induced femoral neck fracture.