Hip Complex Structure and Function Flashcards

Flashcards on the structure and function of the hip complex.

Angle of Inclination

Angle formed by the femoral neck and the femoral shaft in the frontal plane.

Coxa Varus

Angle of inclination < 125 degrees.

Coxa Valgus

Angle of inclination > 125 degrees.

Femoral Torsion

Rotational relationship between the neck of the femur and the femoral shaft.

Femoral Anteversion

Femoral Torsion angle is > 15 degrees.

Femoral Retroversion

Femoral Torsion angle is < 15 degrees.

Acetabular Labrum

Increases articular surface by 30%, distributes/diminishes the load, causes suction-like force.

Lumbopelvic Rhythm

Movement of the lumbar spine in relation to the pelvis.

Ipsidirectional Lumbopelvic Rhythm

Combined movement of pelvis and hip; bending forward = pelvis rotates anteriorly and lumbar spine flexes.

Contradictional Lumbopelvic Rhythm

Pelvis and spine rotate in opposite directions.

Trendelenburg Sign

Weak hip abductors opposite the lower hip; the lumbar spine will bend towards the weak side to compensate.

Multi-Joint Muscles

Multiple joints muscles shortened over both joints = actively insufficient; To stretch, must lengthen at both ends.

Hip Adductors Group

Insert on the pelvis at the pubic ramus with a fiber orientation that allows for function in the sagittal plane, especially in high power situations.

Glut Med Anterior Fibers

Abduct during flexion.

Glut Med Posterior Fibers

Abduct during extension; Hip in neutral= ER.

TFL

Flexion, abduction, IR; Works with gluts to reduce stress on femur.

Glut Max

Stair climbing, Running, Jumping; Greatest force at 70 degrees hip flexion; Works to posteriorly tilt pelvis.

Hamstrings

Extend hip and flex knee; When hip is extended and knee flexed to 90 degrees, the hamstrings do minimal extension.

Hip ER’s name

Piriformis, Gemellus superior, Obturator internus, Gemellus inferior, Obturator externus, Quadratus femoris.

Hip External (Lateral) Rotators

Stabilizes posterior hip joint; Line of force = transverse plane.

Piriformis

Hip flexion>90 = becomes a medial rotator.

Hip Internal (Medial) Rotators

Glut med, glut min, TFL, adductor longus, adductor brevis, pectineus; rotate the pelvis on the swing leg towards the weight bearing stance leg.

Hip flexion

0-120

Hip extension

0-30

Hip abd

0-45

Hip add

0-30

Hip IR and ER

0-45

Ascending Stairs

47-66

Descending Stairs

26-45

Walking

30-44

Sitting

90-112

Putting on Socks

120

Squatting

115