Podcast
Questions and Answers
What makes the knee relatively stable in the frontal plane?
What makes the knee relatively stable in the frontal plane?
- Its muscular strength
- Its articular geometry and strong collateral ligaments (correct)
- Its flexibility in all planes
- Its ability to rotate freely
How were knee movements measured in the study?
How were knee movements measured in the study?
- Using X-ray machines
- Using ultrasound machines
- Using reflective markers and infrared cameras (correct)
- Using manual measurements
How much abduction-adduction movement does the knee have during the first 80% of stance phase?
How much abduction-adduction movement does the knee have during the first 80% of stance phase?
- Minimal and inconsistent (correct)
- Significant and consistent
- None at all
- Excessive and inconsistent
When does approximately 5 degrees of knee adduction occur in most individuals?
When does approximately 5 degrees of knee adduction occur in most individuals?
What is the average abduction (valgus) of the knee at the time of heel contact?
What is the average abduction (valgus) of the knee at the time of heel contact?
Does the knee alignment change throughout the stance phase?
Does the knee alignment change throughout the stance phase?
When does the knee typically abducted an additional 5 degrees?
When does the knee typically abducted an additional 5 degrees?
When does maximum abduction occur in the knee?
When does maximum abduction occur in the knee?
Does the knee return to its slightly abducted position before the next heel contact?
Does the knee return to its slightly abducted position before the next heel contact?
Are studies using skin-mounted markers generally associated with greater error?
Are studies using skin-mounted markers generally associated with greater error?
What is the main reason for the knee's stability in the frontal plane?
What is the main reason for the knee's stability in the frontal plane?
What is the main method used to measure knee movements in the study?
What is the main method used to measure knee movements in the study?
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Study Notes
- The knee is relatively stable in the frontal plane due to its articular geometry and strong collateral ligaments.
- Knee movements were measured in three-dimensions using reflective markers and infrared cameras.
- The knee has minimal and inconsistent abduction-adduction movement during the first 80% of stance phase.
- Approximately 5 degrees of knee adduction occurs in most individuals during the last 20% of stance phase.
- The knee is in an average of 1.2 degrees of abduction (valgus) at the time of heel contact.
- This alignment remains unchanged throughout the stance phase.
- The knee typically abducted an additional 5 degrees during initial swing phase.
- Maximum abduction occurred when the knee was near its maximum flexion angle.
- The knee returned to its slightly abducted position before the next heel contact.
- Studies using skin-mounted markers are generally associated with greater error.
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