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Unformatted text preview: rotation of pelvis in sagittal plane about x axis pubis turns downward and posterior sacrum turns upward Backward or posterior tilt – rotation of pelvis in sagittal plane around x axis. – pubis moves upward and posterior sacrum moves downward Lateral Tilt – – – rotation of pelvis in frontal plane about z axis one iliac crest is depressed, the other elevated often clinically referred to as “hip hike” & “hip drop” Rotation – occurs in horizontal (transverse) plane around y axis Lateral Pelvic Tilt Lateral Relationship of Pelvis to Trunk and Lower Extremities During Movement Movement Pelvis on stationary femur (closed chain hip motions) Pelvis on (relatively) stationary trunk Pelvis and trunk together Pelvis and femur together (“going along for the ride”) – Lumbar­pelvic rhythm… (later) Pelvic Motions Pelvic Video Video Video: Relationship Between Hip, Lumbar Spi Video: Relationship Between Hip, Lumbar Sp Elevation of the right pelvis = Depression of the left pelvis = Left Lateral Pelvic Tilt Left Depression of the right pelvis = Depression Hip Motions Hip Flexion ­ forward movement of femur in sagittal plane Extension – backward movement of femur in sagittal plane Hyperextension – Extension beyond “normal” range ABduction ­ sideward movement of femur in frontal plane, thigh moves away from midline ADduction – return from ABduction Internal rotation ­ rotation around longitudinal axis so that the knee is turned inward External rotation ­ knee turned outward Circumduction ­ combination of flexion, abduction, extension, and adduction performed sequentially in either direction Flexion Flexion Extension ABduction ABduction ADduction Internal Rotation Internal External Rotation Lumbar-Pelvic Rhythm… Lumbar-Pelvic The coordinated activity of lumbar spine, pelvis, and femur that results in production of greater range of motion than is available to one segment alone. Coupled Actions: oupled Pelvis and Femur Pelvis Coupled Actions: Pelvis & Femur Femur More detail: Given the limitation of the ROM of the thigh at the hip joint, movement of the pelvis will often move in conjunction with the thigh to increase the ability of the foot to rise in the air. Let’s look at the soccer player… And the ballet dancer Muscles of Lower Extremities Muscles Hip Flexors (Anterior muscles) – Iliopsoas ­ prime mover for hip flexion when pelvis is stabilized (open – chain) – Pectineus ­ prime mover for hip flexion; assists with ADduction – Rectus Femoris ­ only portion of quadriceps that crosses hip and knee; prime mover for hip flexion and knee extension Pectineus Muscles of Lower Extremities (cont’d) Muscles Hip Extensors (Posterior muscles) – Hamstrings ­ biceps femoris, semimembranosus, semitendinosus; very strong hip extensors and knee flexors – Gluteus Maximus ­ most superficial fibers insert into iliotibial band; prime mover for hip extension and external rotation of hip Muscles of Lower Extremities (cont’d) Muscles Hip ADductors (Medial muscles) – Group of muscles that includes pectineus, adductor minimus, brevis, longus, magnus, and gracilis. – All, except pectineus, are prime movers...
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