Hip motion related to age and sex.

In a selected population 4 years old to adult age, 1,522 hips in 761 healthy subjects of both sexes were studied. Arcs of passive motion of the hip were measured by the technique recommended by the American Academy of Orthopaedic Surgeons. The lower and upper limits of normal range of hip motion in all the planes were established for both sexes in the different age groups. We found that the amplitude of most hip motions decreased with age. Females had higher ranges of total hip motion, total rotation, internal rotation, and abduction compared with males.