Author/Editor		Zupanc, Oskar
Title		Biomehanska analiza zdrsa glavice stegnenice
Type		monografija
Place		Ljubljana
Publisher		Univerza v Ljubljani, Medicinska fakulteta
Publication year		2006
Volume		str. 62
Language		slo
Abstract		Introduction. Slipped capital femoral epiphysis (SCFE) is an important orthopedic problem which emerges in early adolescence. Many hypotheses regarding its ethiology have been put forward (endocrine, vascular, hereditary, mechanical), however, a question, which mechanisms are involved remains unanswered. Mechanical hypothesis is presuming that during stance and gait higher shear stress exerting on the proximal femoral epiphyseal plate of the adolescent with SCFE could be the cause of the slip. During the slip, the femoral head (epiphysis) remains in the acetabulum, while the femur rotates outwards and backwards (in extension). The proximal femoral physis is during acclerated growth period in adolescence and due to cartilage structure with respect to shear force biomechanically the weakest part of the hip. The magnitude of the shear force in the proximal femoral physis depends on the magnitude of some biomechanical and geometrical parameters of the hip and pelvis. Also, later, after the operative treatment of SCFE, results and the development of early degenerative changes of the hip depend on biomechanical factors of the hip and pelvis. Aim. The aim of the study is to find out the role of some biomechanical and related geometrical parameters in SCFE. Hypotheses. In the population of hips with elevated risk for the slip the values of the maximal shear stress in the growth zone, the hip joint resultant force and the peak contact hip stress are on the average higher than in the population of healthy hips. Geometrical parameters connected to biomechanical parameters of pelvis and proximal femura in the population of hips with elevated risk for the slip are on the average different from the corresponding geometrical parameters in the population of healthy hips. Methods. In the archives of the Dept. of Orthopaedic Surgery in Ljubljana we found medical records of all patients with SCFE who were treated operatively from 1970 to 2005. (Abstract truncated at 2000 characters)
Descriptors		FEMUR HEAD EPIPHYSES, SLIPPED BIOMECHANICS STRESS, MECHANICAL HIP ADOLESCENCE MODELS, THEORETICAL