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Hip Biomechanics and Osteotomies

Hip Biomechanics and Osteotomies - Hip Biomechanics and...

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Hip Biomechanics and Osteotomies Trevor Stone March 7, 2002
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Organization Introduction Hip Biomechanics Principles of Osteotomy Femoral Osteotomies Pelvic Osteotomies Summary
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Inroduction Osteoarthritis is very prevalent Primary OA most common Secondary OA not insignificant Three main pediatric hip pathologies Hip Dysplasia Legg-Calve-Perthes Disease Slipped Capital Femoral Epiphysis
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Hip Mechanics Hip designed to support BW permit mobility Max ROM 140 flex/ext, 75 add/abd Functional ROM 50-60 flex/ext 1.8-4.3 x BW through hip Highest ascending stairs
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Hip Biomechanics Forces acting across a hip joint can be measured either Directly with implanted strain-gauged endoprosthesis Mathematical model calculations – 2D static analysis
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2D Static Analysis One legged stance 5/6 BW on femoral head Ratio of lever arms to BW 3:1
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Biomechanics of Cane Cane in Contralateral hand decreases JRF Long moment arm makes so effective 15% BW to cane reduces joint contact forces by 50%
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Biomechanics Dynamic analysis much more complex Forces across hip joint combination of: Body weight Ground reaction forces Abductor muscle forces
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Biomechanics Improving abductor function will decrease joint reactive forces
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