Ghormley85 presents some novel ideas that should be kept in mind when the hip is examined. He presents clearly the complete range of normal hip motions, and characteristic motion patterns of important diseases are fully described. The limit of motion in any one plane depends on the position of the limb in other planes. Normally, there is 120 degrees of flexion, and with the extremity slightly abducted and externally rotated between 0 and 20 degrees this is increased 10 degrees. The maximum of external rotation, 70 degrees, is found when the hip is slightly flexed and moderately abducted. The maximum, 40 degrees, of internal rotation is between 10 and 30 degrees of flexion and 20 degrees adduction. Ghormley uses an arthrometer to measure combined motions accurately. Certain diseases present rather characteristic patterns of motion. [Ed. Note (J. J. F.).—Persons interested in the mechanics of the hip should resort to
FAHEY JJ. PROGRESS IN ORTHOPEDIC SURGERY FOR 1944 A REVIEW PREPARED BY AN EDITORIAL BOARD OF THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS: IV. CONDITIONS INVOLVING THE HIP JOINT. Arch Surg. 1945;51(3):188–195. doi:10.1001/archsurg.1945.01230040195009
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