PubMed · 369986
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C M Weiss, K W Judy. 1977. Universal bone spirals promote additional abutment support.. https://pubmed.ncbi.nlm.nih.gov/369986/
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The pre- or intraoperative classification of intertrochanteric fractures into stable and unstable is based on the status of the bone in the critical calcar femorale area and the obliquity of the fracture line. Modern management of unstable intertrochanteric fractures may include displacement at the fracture site, osteotomy, and fixation with a sliding screw system. These procedures produce postoperative films of an "unusual" appearance. The radiologist must understand the principles of classification and management to properly interpret the pre- and postoperative films.
Many methods of fixation have been used after proximal abductory metatarsal osteotomies for the correction of metatarsus primus varus. The methods include external immobilization and the application of devices such as stainless steel wire, Kirschner wires, staples, and compression plates. We have combined external immobilization with compression screw fixation across the osteotomy site. Two different types of screws were used: 1) an AO screw 3.6 mm. wide and 26 to 28 mm. long and 2) a standard Woodruff screw 3.5 mm. wide and 31.8 to 44.4 mm long. Twenty-two procedures were reviewed. When we compared the results, we found the AO screw to be superior in the degree of rigid fixation which it provides, as judged by the extent of postoperative callus formation.