title: Aspects of internal fixation of fractures in porotic bone. Principles, technologies and procedures using locked plate screws.
abstract: Fractures of the bones of elderly people occur more often and have a more important effect because of a generally diminished ability to coordinate stance and walking. These fractures occur at a lower level of load because of lack of strength of the porotic bone. Prompt recovery of skeletal support function is essential to avoid respiratory and circulatory complications in the elderly. To prevent elderly people from the risks of being bedridden, demanding internal fixation of fractures is required. The weak porotic bone and the high level of uncontrolled loading after internal fixation pose complex problems. A combination of several technical elements of design, application and aftercare in internal fixation are proposed. Internal fixators with locked screws improve the biology and the mechanics of internal fixation. When such fixators are used as elevated splints they may stimulate early callus formation because of their flexibility, the limit of flexibility being set by the demands of resistance and function of the limb. Our own studies of triangulation of locked screws have demonstrated their beneficial effects and unexpected limitations.
authors.affiliation: AO Forschungsinstitut, Davos, Schweiz.
authors.forename: S M
authors.initials: SM
authors.lastname: Perren
authors.forename: B
authors.initials: B
authors.lastname: Linke
authors.forename: K
authors.initials: K
authors.lastname: Schwieger
authors.forename: D
authors.initials: D
authors.lastname: Wahl
authors.forename: E
authors.initials: E
authors.lastname: Schneider
mesh_terms: D000368:Aged; D001860:Bone Plates; D001863:Bone Screws; D001842:Bone and Bones / Q000503:physiopathology; D005593:Fracture Fixation, Internal / Q000379:methods*; D050723:Fractures, Bone / Q000150:complications; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D010024:Osteoporosis / Q000150:complications / Q000503:physiopathology*; D013314:Stress, Mechanical