Angle of Inclination |Coxa Valga | Coxa Vara- (Hip Biomechanics) 

Simplified detailed lecture on Angle of inclination,Coxa valga and Coxa vara of hip complex.Angle of inclination occurs in the frontal plane with an axis passing through the femoral head and neck with the longitudinal axis of femur.The normal angle of inclination of femur is about 125 degrees and can have a value ranging from 110-144 degree. In women angle of inclination is smaller than that of men mostly due to the wider pelvis and further there is individual variations between average values of angle of inclination.The angle of inclination changes across the lifespan for instance its 150 degree at birth.
A pathological decrease in medial angulation of neck and shaft is known as Coxa Vara and an increase in the angulation is known as Coxa Valga. In coxa valga angle aof inclination is greater than 125 degree and it results in various changes in body like change in abductor muscle moment arm, decrease in trabecular system of femur,decrease stability of hip,predisposes to hip dislocation etc. At the same Coxa Vara increases stability of hip,improvement in congruence, increase moment of abductor muscles etc.
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TONY JOSEPH
ASSISTANT PROFESSOR
KANNUR MEDICAL COLLEGE