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Ortho - Hip
Hip biomechanics
| Question | Answer |
|---|---|
| Anterior/posterior tilt of the pelvis occurs in which plane and around which axis? | sagittal plane, frontal axis |
| Lateral pelvic tilt occurs in which plane and around which axis? | frontal plane, A-P axis |
| Anterior/posterior tilt results in what motions? | flexion/extension |
| Lateral pelvic tilt results in which motions? | abduction/adduction |
| Pelvic rotation occurs in which plane and around which axis? | transverse, vertical axis |
| Pelvic rotation results in which hip motions? | internal/external rotation |
| Coordinated hip/pelvis/spine motion is called what? | The lumbopelvic rhythm |
| Toe touch requires ___ degrees of hip flexion and ___ degrees of lumbar flexion? | 90, 45 |
| What kind of joint is the hip? | diarthrodial tri-axial ball and socket joint |
| What is the closed packed position of the hip? | combined extension, internal rotation, and abduction |
| What is the open packed position of the hip? | 30 degrees of flexion, 30 degrees of abduction, and slight ER |
| A capsular pattern in the hip results in gross limitation of what motions? | flexion, IR, and some abduction |
| The acetabulum is made up of what three bones? | ilium, ischium, and pubis |
| What direction does the acetabulum face? | laterally, anteriorly, and inferiorly |
| What % of the head of the femur articulates with the acetabulum? | 70 |
| What is normal forward angulation? | 12-15 degrees |
| Coxa vara is defined as? | angulation < 120 |
| Coxa Valga is defined as? | angulation > 135 |
| What is the angle of inclination? | angle between the shaft and the neck of the femur |
| What is the normal angle of inclination? | 125 degrees |
| What does coxa vara lead to? | Genu Valgum |
| What does coxa valga lead to? | Genu Varum |
| What condition lengthens the limb, reduces the effectiveness of the abductors, increases the load on the femoral head and reduces the load on the femoral neck? | Coxa Valga |
| What condition shortens the limb, increases the effectiveness of the abductors, reduces the load on the femoral head and increases the load on the femoral neck? | Coxa Vara |
| What is the angle of torsion? | Relationship between femoral head and femoral condyles |
| What is the normal angle of torsion? | 15 degrees |
| a decreased angle of torsion is called what? | retroversion |
| An increased angle of torsion is called what? | anteversion |
| Retroversion can lead to what? | toe out(duck feet) |
| Anteversion can lead to what? | toe in(pigeon toes) |
| Is the femoral neck inside or outside of the joint capsule? | inside(intracapsular) |
| The iliofemoral ligament runs from the base of the ____ to the _________ _________. | AIIS, Intertrochanteric Line |
| What is the strongedt ligament in the hip? | Iliofemoral ligament |
| What does the iliofemoral ligament prevent? | hyperextension in standing position |
| What ligament runs from anterior pubic ramus to anterior surface of the intertrochanteric fossa? | Pubofemoral ligament |
| The pubofemoral ligament reinforces the fibrous capsule where? | inferiorly and anteriorly |
| What ligament limits abduction and hyperextension? | pubofemoral ligament |
| What ligament originates on the ischial portion of the acetabulum and spirals to the neck of the femur and base of the greater trochanter? | Ischiofemoral ligament |
| What motion does the ishiofemoral ligament prevent? | hyperextension of the hip |
| What motions does the ishiofemoral ligament resist? | adduction and internal rotation |
| What ligament attaches to the acetabular notch and the transverse acetabular ligament to the pit in the head of the femur? | Ligamentum teres |
| What ligament provides blood supply to the head of the femur(primarily in younger populaiton)? | ligamentum teres |
| Normal hip flexion ROM is? | 0-120 |
| Normal hip extension is? | 0-30 |
| Normal hip internal and external rotation is? | 0-45 |
| Normal hip adduction is? | 0-30 |
| Normal hip abduciton is? | 0-45 |
| What are the primary movers in hip flexion? | iliopsoas, sartorius, rectus femoris |
| What are the primary movers for hip extension? | glut max, hamstrings |
| What are the primary movers for hip abduction? | glut med and min |
| What are the primary movers for hip adduction? | adductor longus/magnus/brevis |
Created by:
txst sum 2009
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