460-3 - TheHip AngleofInclination Frontalplane

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The Hip
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Angle of Inclination Frontal plane Normal-- approximately 125 in the adult, and  averages about 120 in the normal elderly person Coxa Varum-- less than 120 Coxa Valgum-- greater than 135
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Angle of Inclination
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Coxa Valga Decreases amount of femoral articular surface in  contact with the superior and central labrum Decreases stability of the hip Predisposes hip to dislocation
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Coxa Varum Can actually increase stability of the joint if not too  extreme. Can predispose the femoral neck to fracture
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Angle of Torsion Transverse plane Head and neck of femur rotate outward from shaft of  femur Normal--average is 15 degrees in adults
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Femoral Anteversion Torsion angle greater than 15 degrees Causes pidgeon toe (toeing in) Femur must medially rotate to restore congruence to  the joint Predisposes hip to anterior dislocation
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Femoral Retroversion Torsion angle less than 15 degrees Causes duck walk (toeing out)
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460-3 - TheHip AngleofInclination Frontalplane

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