Class Notes (836,644)
United States (324,644)
PT 5131 (30)
L Day (25)
Lecture

Hip Joint.docx

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Department
Physical Therapy
Course
PT 5131
Professor
L Day
Semester
Spring

Description
Hip Joint Femur • Angle of Inclination: angle drawn between shaft of femur and line through midline of neck o Around 125/126 degrees in normal adult o Around 140-150 degrees at birth  Weight of body on femoral neck during walking, pushes neck downward as our body grows, decreasing the angle of inclination • Coxa Vara: angle of inclination less and 125 degrees o Vara: bend inward; Coxa: hip • Coxa Valga: angle of inclination greater than 125 degrees o Valga: bend outward Torsion Angle: • Twisting of neck of femur in relationship to rest of shaft of femur • Angle drawn between transverse axis of femoral condyles and the axis of femoral head and neck • Anteversion: 10-15 degree torsion angle (Normal) o Femoral head naturally points anteriorly, compared to condyles of knee • Excessive Anteversion: Torsion angle great than 15 degrees results in a little more of a toeing in of foot • Retroversion: torsion angle less than 15 degrees, closer to 5 degrees, results in a little more of a toeing out of foot • Infants have anteversion of about 30 degrees, and this decreases as we grow older Acetabular Anteversion Angle • Acetabulum points inferiorly, anteriorly, and laterally o We can measure how much it turns anteriorly o Draw a line from tip of anterior rim to tip of posterior rim, and a line anterior to posterior  Results in Acetabular Anteversion Angle = 20 degrees • Exposes anterior head of femur o Anterior head of femur does not sit in acetabulum socket o Head of femur is covered by capsule and muscle tendon • Retroverted if acetabulum projects laterally or posterior-laterally • The acetabulum is Anteverted and the femoral neck is Anteverted naturally • External rotation of the hip results in more coverage of the Acetabulum on the Femur o Best configuration for fitting head of femur in acetabulum: hip flexion, external rotation, and abduction Hip Joint (Dislocated) • Hip joint is ball-and-socket synovial joint between head of femur and acetabulum of pelvis • Acetabulum composed of ilium, ischium, and pubic bones • Labrum: small fibrocartilage lip on rim of acetabulum o Deepens the socket, increases the stability of the hip joint  Almost impossible to dislocate hip without tearing labrum o Not a complete circle because acetabular rim is not a complete circle • Transverse Acetabular Ligament: connects one edge of labrum to other end of labrum over the acetabular notch • Articular cartilage located inside acetabulum o Does not cover complete surface of acetabulum due to the fact that center of acetabulum does not come in contact with femur ever • Ligamentum Teres: comes out of acetabular notch and connects onto fovea of femur o Has small, shriveled up, and sometimes useful artery that comes off the Obturator Artery o Provides little to no stability of hip joint Hip Joint • Acetabulum only covers about half of the head of the femur • Joint capsule surrounds this, down from acetabular rim to Intertrochanteric Line anteriorly o Articular capsule does not attach to the posterior surface of the femur  Leaves posterior surface of femur exposed, especially during flexion of hip joint • Synovial membrane protrudes slightly on posterior surface, creating a little bi
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