Maintenance of Proximal Cortical Bone with Use of a Less Stiff Femoral Component in Hemiarthroplasty of the Hip without Cement. An Investigation in a Canine.

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Presentation transcript:

Maintenance of Proximal Cortical Bone with Use of a Less Stiff Femoral Component in Hemiarthroplasty of the Hip without Cement. An Investigation in a Canine Model at Six Months and Two Years* by T. M. TURNER, D. R. SUMNER, R. M. URBAN, R. IGLORIA, and J. O. GALANTE J Bone Joint Surg Am Volume 79(9): September 1, 1997 ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 1 Photograph of the less stiff (left) and stiffer (right) femoral stems, which had the same shape and were both circumferentially porous-coated along the entire length, except for the distal five millimeters. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 2 Drawing showing the location of the sections. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 3 Contact radiographs of two-millimeter-thick cross sections taken from the region of the lesser trochanter (section C) at six months. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 4 Graphs showing the mean change in the cortical area associated with the less stiff (circles) and stiffer (squares) stems, according to the section, at both time-periods. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 5 Graphs showing the mean change in the cortical bone area fraction associated with the less stiff (circles) and stiffer (squares) stems, according to the section, at both time-periods. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 6 Graphs showing the mean amount of bone loss at the subperiosteal, endocortical, and haversian surfaces along the lengths of the less stiff and stiffer stems. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 7 Graphs showing the mean change in the medullary bone area fraction associated with the less stiff (circles) and stiffer (squares) stems, according to the section, at both time-periods. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.

Fig. 8 Graphs showing the mean volume fraction of bone ingrowth into the less stiff (circles) and stiffer (squares) stems, according to the section, at both time-periods. T. M. TURNER et al. J Bone Joint Surg Am 1997;79: ©1997 by The Journal of Bone and Joint Surgery, Inc.