Hip Internal Rotation - 10th Lecture PDF

# 10th Lecture: Theoretical Part: Hip Internal Rotation ## Objectives At the end of this lecture the student will be able to: 1. Identify the primary muscles involved in hip internal rotation 2. Identify the range of motion of hip internal rotation 3. Describe effect of weakness of hip internal r...

# 10th Lecture: Theoretical Part: Hip Internal Rotation ## Objectives At the end of this lecture the student will be able to: 1. Identify the primary muscles involved in hip internal rotation 2. Identify the range of motion of hip internal rotation 3. Describe effect of weakness of hip internal rotation 4. Describe effect of contracture of hip internal rotation ## Content 1. Primary muscles involved in hip internal rotation 2. Range of motion of hip internal rotation 3. Test procedures for hip internal rotation 4. Effect of weakness of hip internal rotation 5. Effect of contracture of hip internal rotation ## 1. Hip Internal Rotation ### Primary Muscles: 1. Gluteus minimus 2. Tensor fascia latae ### Accessory Muscles: 1. Gluteus medius 2. Semitendinosus 3. Semimembranosus 4. Superior portion of the adductor magnus 5. Adductors brevis and longus ## Range of Motion With the knee in flexion, the hip internal rotation is 45° of motion. With the knee in extension, the range of motion will have a tendency to be less in amplitude. ## Factors Limiting Motion 1. When the hip is extended, tension of iliofemoral ligament 2. When the hip is flexed, tension of ischiocapsular ligament 3. Tension of hip external rotator muscles ## Anatomy of Gluteus Minimus Muscle ### Origin - External surface of the ilium, between the anterior and inferior gluteal lines. - Margin of the greater sciatic notch ### Insertion - Anterior border of the greater trochanter of the femur and hip joint capsule ### Nerve Supply - Superior gluteal ### Action - Abducts, medially rotates and may assist in flexion of the hip joint ## Anatomy of Tensor Fascia Latae Muscle ### Origin - Outer surface of anterior iliac crest between tubercle of the iliac crest and anterior superior iliac spine. ### Insertion - Inserted by iliotibial tract into the anterior surface of lateral condyle of tibia. ### Nerve Supply - Superior gluteal nerve. ## Action a. Flexion, abduction and internal rotation of hip. b. In standing posture, it assists gluteus maximus via iliotibial tract to maintain knee joint in extension position. ## Effect of Weakness of Hip Internal Rotators: Weakness of the hip internal rotation of the femur is accompanied by lateral rotation and abduction of the thigh. ## Effects of Contracture and Shortness of Hip Internal Rotators: a. Accompanied by pronation of the foot and a tendency toward a knock-knee (or valgus) position. b. Inability to laterally rotate the thigh through the full range of motion. c. Inability to sit in a cross legged position (i.e., tailor fashion). <br> The document includes a diagram showing the anatomy of the *Gluteus Minimus* muscle, and two images showing the *Tensor Fascia Latae* muscle and the effects of knock-knee. It also includes a diagram showing the differences between a *normal*, *bowleg* and *knock-knee*.