Hip Internal Rotation Quiz

Hip Internal Rotation

• Objectives: Students will identify primary muscles involved in hip internal rotation, range of motion, effects of weakness and contracture.

• Content: Focuses on primary and accessory muscles, range of motion (with knee flexion and extension), testing procedures, effects of weakness and contracture.

Primary Muscles

• Gluteus Minimus

• Tensor Fascia Latae

Accessory Muscles

• Gluteus Medius

• Semitendinosus

• Semimembranosus

• Superior portion of Adductor Magnus

• Adductors Brevis and Longus

Range of Motion

• Flexion: 45 degrees of internal rotation.

• Extension: Reduced range of motion compared to flexion.

Factors Limiting Motion

• Iliofemoral ligament (hip extended)

• Ischiocapsular ligament (hip flexed)

• Hip External Rotator Muscles

Anatomy of Gluteus Minimus

• Origin: External surface of ilium, between anterior and inferior gluteal lines, margin of greater sciatic notch.

• Insertion: Anterior border of greater trochanter of femur and hip joint capsule.

• Nerve Supply: Superior gluteal nerve.

• Action: Abduction, medial rotation, and assists in hip flexion.

Anatomy of Tensor Fascia Latae

• Origin: Outer surface of anterior iliac crest, between tubercle of iliac crest and anterior superior iliac spine.

• Insertion: Iliotibial tract into the anterior surface of lateral condyle of tibia.

• Nerve Supply: Superior gluteal nerve.

• Action: Flexion, abduction, and internal rotation of hip. Aids in maintaining knee extension in standing.

Effect of Weakness

• Weakness of internal rotators leads to lateral rotation and abduction of the thigh.

Effect of Contracture/Shortening

• Knock-knee (valgus) position

• Impaired lateral rotation

• Inability to sit in cross-legged position