Download Muscle Activity Analysis of Pelvic and Hip Flexors

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