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2Baumgaermer MR, Curtin SL, Lindskog DM, et al. The value of the tip - apex distance in predicting failure of fixation of peritrochanteric fractures of the hip. J Bone Joint Surg ( Am), 1995,77 : 1058
3Davis TR, Sher JL, Horsman A, et al. Intertrochanteric femoral fractures, mechanical failure after internal fixation. Ibid, 1990, 72(13) : 26.