30 Questions
What is the recommended method of carrying an object for an individual with unilateral hip pain or degeneration?
With the ipsilateral arm
Which action should a person with painful, unstable, or surgically replaced hips be cautious about?
Carrying large hand-held loads contralateral to the affected hip
In total hip arthroplasty, what is replaced with biologically inert materials?
Acetabulum and femoral head
Which type of fixation may secure a prosthetic hip in total hip arthroplasty?
Biologic fixation provided by bone growth into implanted components
What is the consequence of carrying an object with the contralateral arm for an individual with hip pain or degeneration?
Greater joint reaction force
Why is it advised to carry an object with the ipsilateral arm for someone with unilateral hip pain or degeneration?
To decrease compression force on the hip joint
What may contribute to the loss of fixation in total hip arthroplasty?
Torsional loads between the prosthetic implant and bony interface
Which factor can result in osteolysis and weakening of the surrounding bone in total hip arthroplasty?
Worn implanted component debris
What is the surgical operation that involves intentionally altering the angle of inclination of the femoral head to the acetabulum by cutting a wedge of bone from the proximal femur?
Coxa vara (or valga) osteotomy
What is a characteristic of coxa valga?
The angle is greater than the normal adult angle
What is one of the goals of a coxa vara (or valga) osteotomy?
To improve weight-bearing surface congruency of the hip
What is a potential complication that may arise from total hip arthroplasty?
Dislocation of prosthetic hip
What is the effect of excessive anteversion on the hip joint?
Lead to marked joint incongruence
How does the femur respond to excessive anteversion to restore joint congruence?
Medially rotate
What gait abnormality is typically seen in a patient with excessive anteversion?
Toe-in gait
What effect does femoral retroversion have on the labrum?
Result in crushing of the labrum
Who is more likely to experience femoral neck fractures?
Elderly adults with good bone density
At what age do more than 90 percent of femoral neck fractures occur?
Over 50 years old
What is a potentially positive effect of coxa valga?
Improved force-generating ability of hip abductor muscles
Which of the following is a potentially negative effect of coxa valga?
Decreased moment arm available to hip abductor force
How does coxa valga affect the risk of dislocation in extreme cases?
Increases the risk of dislocation
What is a characteristic of coxa vara's angle of inclination compared to the normal adult angle?
Less than 125⸰
How does coxa vara affect the position of the femoral head?
Deeper into the acetabulum
What is a potential positive effect of coxa vara?
Improved stability of hip joint
How does coxa vara potentially benefit people with hip abductor weakness?
By increasing the leverage of the abductor muscles
What potential negative effect of coxa vara increases the likelihood of a 'gluteus medius limp?'
Coxa vara may decrease the functional length of the hip abductor muscles.
How does excessive femoral anteversion affect the angle of torsion?
It increases the angle of torsion
What is a potential consequence of marked coxa vara in children?
Slipped capital femoral epiphysis
How does a varus osteotomy potentially improve joint stability?
By aligning the femoral head more directly into the acetabulum
What is one potential benefit of reducing muscular-based joint forces in an arthritic or unstable prosthetic hip?
Decreased excessive wear during walking
Learn about the influence of different methods of carrying external loads on the demands placed on the hip abductor muscles and hip joint. Understand the caution for individuals with painful, unstable, or surgically replaced hips when carrying hand-held loads. Discover the recommended way to carry objects for those with unilateral hip pain or degeneration.
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