Bone Growth and Skeletal Deformities Quiz
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Questions and Answers

What is the main cause of muscle contractures in cerebral palsy (CP)?

  • Abnormal bone growth
  • Lack of muscle growth
  • Spasticity leading to abnormal muscle tone (correct)
  • Excessive exercise

    • Why do spastic muscles not grow normally in CP?

  • Lack of proper nutrition
  • Excessive lengthening exercises
  • Overuse of the muscles
  • Resistance to increases in length (correct)

    • What is the primary cause of skeletal deformity in year 1?

  • Malleable bone due to spasticity (correct)
  • Ossified bone from standing/walking
  • Excessive femoral anteversion
  • Less effective hip abductors

    • What effect can contractures have on bone growth in individuals with CP?

    <p>Prevent normal bone remodeling</p> Signup and view all the answers

    What happens to bone growth in year 2 compared to year 1?

    <p>Year 2 bone growth is less than year 1</p> Signup and view all the answers

    What is the impact of parallel forces on epiphyseal growth in individuals with CP?

    <p>Inhibit growth</p> Signup and view all the answers

    In coxa valga, what is the impact on the hip abductor moment arm?

    <p>Decreases</p> Signup and view all the answers

    Why does abnormal bone growth occur in cerebral palsy (CP) according to the text?

    <p>Contractures leading to skeletal deformities</p> Signup and view all the answers

    How does the mechanical lever system work in maintaining knee extension in individuals with CP?

    <p>By ensuring rigid foot and stiff ankle</p> Signup and view all the answers

    What is the consequence of not maintaining pelvic obliquity in single-leg stance with coxa valga?

    <p>Trendelenburg sign</p> Signup and view all the answers

    Which of the following best describes the impact of coxa breva?

    <p>Requires surgical correction</p> Signup and view all the answers

    What is the purpose of Trochanteric transfer in correcting coxa valga?

    <p>Restore femoral neck-shaft angle</p> Signup and view all the answers

    What is a common cause of torsional deformities in cerebral palsy (CP)?

    <p>Excessive femoral anteversion</p> Signup and view all the answers

    In malrotated lever arms, external tibial rotation causes the ground reaction force (GRF) to move in which direction?

    <p>Posteriorly &amp; laterally</p> Signup and view all the answers

    What secondary moments are introduced when external tibial rotation is present?

    <p>Eversion &amp; external rotation</p> Signup and view all the answers

    How does external tibial rotation impact the knee extensor moment?

    <p>Reduces the lever arm</p> Signup and view all the answers

    Which of the following may occur due to unwanted moments caused by abnormal bone growth?

    <p>Pes valgus</p> Signup and view all the answers

    What surgical intervention is typically required for correcting torsional deformities?

    <p>Ilizarov frame application</p> Signup and view all the answers

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