Author/Editor		Iglič, A; Srakar, F; Antolič, V; Kralj-Iglič, V; Batagelj, V
Title		Mathematical analysis of Chiari osteotomy
Type		članek
Source		Acta Orthop Iugosl
Vol. and No.		Letnik 20, št. 2-3
Publication year		1990
Volume		str. 35-9
Language		eng
Abstract		A simple static three-dimensional mathematical model of the hip was constructed in order to simulate Chiari pelvic osteotomy. In this model the average muscle tensions are assumed to be equal in the single muscle group, which enables us to include in the model the number of muscles which exceeds the number of model force and momentum equilibrium equations without any optimization condition. It was calculated that shifting of the femoral head medially for 1 cm reduced the magnitude of the hip joing reaction force by approx 10 percent. Therefore it was concluded that while periforming the Chiari pelvic osteotomy the femoral head must be shifted medially as far as possible.
Descriptors		HIP JOINT OSTEOTOMY MODELS, THEORETICAL BIOMECHANICS MUSCLE, SKELETAL TENSILE STRENGTH