Kines Hip Flashcards
How much does the acetabulum face inferior in men vs women
There is a 22-42 range
Men: 38 degrees
Women: 35 degrees
What is another name for Right Pelvic External rotation
Left pelvic backwards rotation
What sections of the pelvis make up the posterior portion of the acetabellum
Ischium
How will a compensated retroversion present
External rotation of the LE
Toes are pointed out
Arthrokinematics of OCK IR
Anterior Roll Posterior Glide
Describe the structure of the proximal femur
It is more spherical than the acetabulum
Has a fovea capitis
What are the Transverse plane motions of the hip and the normal values
IR in extension (0-55) IR in Flexion (0-45) ER in extension (0-55) ER in Flexion (0-45)
Explain Right Pelvis Drop
Left leg is on ground as the axis of rotation
- The right pevis will depress
- Lumbar will bend to the right
Arthrokinematics of OCK Adduction
Inferior Roll Superior Glide
How will a tight iliopsoas present
Tight illiacus= anterior tilt of pelvis
Tight psoas major= Lumbar lordosis
What is retroversion
When the angle of “version” is less than 8-15 degrees or in a lateral torision
What are the medial rotators of the hip
- There are no muscles with a primary function of IR
- The TFL and glute medius (anterior fibers) may play the largest roles.
- Glute minimus
- Piriformis if the beyond 90 degrees of flexion
Explain the angle of inclination of the proxima femur and how it changes with age
Has a frontal plane inclination that gives the body its
What adductor will cross both the knee and the hip
The Gracillis
What are the primary muscles for lateral rotation of the hip
- Obturator internus
- Piriformis
- Obturator externus
- Quadratus femoris
- Sperior Gemellus
- Inferior gemellus
Explain Right hip Hiking
The Left leg with the femur in the acetabellum acts as the axis of rotation.
- The right pelvis ill elevate
- Lumbar will bend to the left
What will a greater angle of inclination result in on the lower extremity
Increased leg length
More of a valgus
What will limit the rotation of the hip while the hip is in 90 degrees of flexion
The posterior capsule
What are the sagittal plane motions and values for the hip
Flexion (0-120) Extension (0-20)
What will coxa valga result in for the lower extremity
Increased leg lenght
Increased pre-load to the abductors
Decreased moment arm of abductors
What are the secondary muslces used for ER of the hip
Glute medius (posterior fibers)
Superior gluteus maximus
Explain the different actions of the Glute. Med.
All fibbers Abduct the hip
Anterior fibers flex and IR
Posterior fibers Extend and ER
Which has a greater peak isometric torque on the hip the adductors or abductors
Adductors
Why is there a lack of superior stability in the hip joint
The angle of inclination of the femur is greater than the acetabular angle of inclination. This exposes a portion of the femur head.
Arthrokinematics of OCK ER
Posterior Roll Anterior Glide
What are normal values for antiversion
8-15 degrees of torsion
Explain the stability of the hip in the transverse plane
The acetabulum and the head of the femur are both facing anterior, which will expose the head of the femur anteriorly. Thus there is less stability anterior than there is posteriorly
What is this an example of
Anterior Pelvic Tilt
What is another name for left pelvic forward rotation
Right pelvic internal rotation
What are the frontal plane motions of the hip and the normal values
Abduction (0-45) Addiction (0-30)
How much doe the acetabellum face anteriorly in men vs women
Men 18.5 degrees
Women 21.5 degrees
What sections of the pelvis make up the anterior portion of the acetabellum
The Illum and Pubis bones
What is the characteristic of an uncompenstated retroversion, and what pathology is more likely to occur is this position
The head of the femur is exposed posteriorly
Posterior dislocation
What are the 3 ways the acetabular will change with age
- Increased superior stability
- Increased central stability
- Reduced co-adaptation (matching up perfectly)
Arthrokinematics of OCK Flexion
Spin
What will a coxa varus result in the lower extremity
Shorter leg length
Impingment limiting ROM
Poor length tension relationship for abbductors
What will happen to anteversion of the hip as we get older
It will begin to decrease
How will one present while compensating for excessive anteversion
IR of lower extremity
Toes pointed in
What is this an example of
Posterior Pelvic Tilt
Why is the open pack position have the most congruency in the hip
The ligaments will “uncoil” with flexion, abduction, and external rotation
Arthrokinematics of OCK Abduction
Superior Roll
Inferior Glide
What is the position that has the most congruency in the hip
The open pack position
30-30-slight
Unlike other structures where the closed pack will have the most congruency
Describe the orientation of the Acetabellum
Faces Lateraly and Anterior
*Antiversion
Arthrokinematics of OCK Extension
Spin
What is superincumbent weight
How much superincumbent weight is placed on each femur in bilateral stance
1/2 of superincumbant weight
How much abductor muscle force is required in the bilateral stance
Zero if there are no deformities/pathologies
How much weight is on a leg in unilateral stance
Full superincumbent weight or 2/3 of total BW PLUS the weight of the unsupported leg
How much is the adduction moment of the leg in unilateral stance
(Superincumbent weight + Weight of other leg)(Moment arm of Hat)/ The distance of the moment arm of abductors
What would the adductor moment be, or the abduction force required for a 210 pound patient in unliateral stance
(140+30)x4
2
340#
