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Brunnstrom’s Clinical Kinesiology Sixth Edition CHAPTER 9 Pelvis and Hip Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Bones Pelvis Made up of the two innominate (ilium, ischium, pubis) and sacrum Innominates come together at acetabulum Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition The bony pelvis. 1. Sacrum 2. Ilium 3. Ischium 4. Pubic bone 5. Pubic symphysis 6. Acetabulum 7. Obturator foramen 8. Coccyx Red line: Terminal line/pelvic brim Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Joints Hip Synovial ball-and-socket (enarthrodial) joint with three degrees of freedom Same movements as GH joint? Acetabulum Deep sphere rimmed by labrum Stability compared to GH joint? Femoral head larger than acetabulum Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Joints Hip—osteokinematics Pelvic motion on femur Anterior/posterior tilt—sagittal plane Lateral tilt—frontal plane Protraction/retraction—transverse plane Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Joints Hip—osteokinematics Femur on pelvis Flexion/extension—sagittal plane Abduction/adduction—frontal plane Medial/lateral rotation—transverse plane Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscles Flexors Iliopsoas Rectus femoris Only quadriceps to cross the hip Sartorius Pectineus Tensor fascia latae Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscles Adductors Adductor magnus Adductor longus Adductor brevis Gracilis Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscles Extensors Gluteus maximus Hamstrings Biceps femoris Except for short head Semitendinosus Semimembranosus Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscles Abductors Gluteus medius Gluteus minimus Tensor fascia latae Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscles Lateral rotators Piriformis Gemellus superior and inferior Obturator internus and externus Quadratus femoris Medial rotators No primary medial rotators of the hip Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Factors Affecting the Role of Hip Muscles Muscular sufficiency—multiple joints vs. single joint Several two-joint muscles at hip Able to create greatest tension when elongated at one and shortened at other—length/tension Shortening at both joints will lead to active insufficiency Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscle Activity Analysis of Pelvic and Hip Flexors Iliopsoas most powerful hip flexor Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscle Activity Analysis of Pelvic and Hip Extensors Gluteus maximus most powerful hip extensor Copyright © 2012 F.A. Davis Company Brunnstrom’s Clinical Kinesiology Sixth Edition Muscle Activity Analysis of Pelvic and Hip Abductors Gluteus medius strongest hip abductor Copyright © 2012 F.A. Davis Company