An Evaluation of Trapezoidal-28 Femoral Stem FracturesRITTER, MERRILL, A.; CAMPBELL, ELAINE, D.Clinical Orthopaedics and Related Research: November 1986 - Volume 212 - Issue - p 237–244 SECTION II: GENERAL ORTHOPAEDICS: PDF Only Free Abstract Author InformationAuthors Fourteen patients sustaining femoral stem fractures of cold rolled wrought stainless steel Trapezoidal-28 prostheses (Zimmir, Warsaw, Indiana) were compared statistically with 259 successful hip replacements of the same type of prosthesis to determine possible factors predisposing to prosthetic fracture. Varus alignment was the highest contributing factor in these femoral stem fractures. Calcar resorption and insufficient distal lateral cement support also were contributory. Medial cement support was loss for patients sustaining a fracture, but this was not statistically significant. Patients prone to encounter a fracture were men who were young and/or overweight. There was no significant correlation of fracture to preoperative diagnosis, laterality, trochanteric osteotomy, nonunion of the greater trochanter, or wire breakage. From the Department of Medical Research, The Center for Hip and Knee Surgery, Indiana, 46158. © Lippincott-Raven Publishers.