. Applied anatomy and kinesiology. here the ilium, pubes,and ischium join. It is a ball-and-socket joint, having less freedomof motion than the shoulder-joint, the socket being deeper and thebones fitting so closely that much force is required to pull it usual capsular ligament is present and is thickened on thefront side by an A-shaped band called the iliofemoral band or tlieinverted Y-ligament. 138 MOVEMENTS OF THE HIP-JOINT The femur is the longest bone in the body and corresponds in away to the humerus; hke the humerus it has a head, shaft, and tAVocondyles; in place of tuberosit
. Applied anatomy and kinesiology. here the ilium, pubes,and ischium join. It is a ball-and-socket joint, having less freedomof motion than the shoulder-joint, the socket being deeper and thebones fitting so closely that much force is required to pull it usual capsular ligament is present and is thickened on thefront side by an A-shaped band called the iliofemoral band or tlieinverted Y-ligament. 138 MOVEMENTS OF THE HIP-JOINT The femur is the longest bone in the body and corresponds in away to the humerus; hke the humerus it has a head, shaft, and tAVocondyles; in place of tuberosities it has two large prominences, thegreat and small trochanters; along the back of the shaft is the lineaasf era, or rough hue. The hip-joint permits movement of the femur most freely for-ward, and therefore this is called flexion; it can take place through150 degrees or more, when it is stopped by contact of the thighwith the front of the trunk. When the knee is extended the hip- POSTERIOR SUPERIOR SPINE POSTERIOR INFERIOR SPINE. SPINE OF,ISCHIUMSMALL SCIATIC-7 ANOTCH ^ ANTERIOR SUPE-RIOR SPINE ANTERIOR IN-FERIOR SPINE -f^lUM Fig. 81.—The hip bone of right side, outer surface. (Gei-rish.) joint can be flexed only to the extent of a right angle, but this isdue to tension of the hamstring muscles and not to the form of thejoint. The reverse of flexion, movement of the femur downward andbackward, is called extension, and is free until the limb is verticallydownward in line with the trunk, when it is stopped by tension ofthe iliofemoral band, making any overextension of the hip impos-sible in normal subjects. Careful examination will show that inapparent overextension of the hip, which occurs when one pushes MOVEMENTS OF THE HIP-JOINT 139 one limb as far back as possible while standing on the other limb,the pelvis tilts back with the moving femur, the movement reallybeing a slight flexion of the other hip and slight overextension ofthe spinal column in the lumbar region. The fa
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