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11 Cards in this Set
- Front
- Back
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What are the (4) Knee Extensors?
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Quadriceps:
Rectus Femoris- knee extension (+ hip flexion) only one to have action at hip, as well Vastus Intermedius Vastus Lateralis Vastus Medialis (give shape to thigh) |
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What do the knee extensors have to do with patellar tracking?
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-combine pull of vasti allows patella to glide in its groove in flexion and extension
-stronger/tighter vastus lateralis will pull patella laterally -stronger/tighter vastus medialis will pull patella medially |
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What are the (3) Knee Flexors?
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biceps femoris (+ outward rotation)
semimembranosis (+ inward rotation) semitendonosis (+ inward rotation) |
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What are the (5) minor knee flexors?
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popliteus
gastrocnemeus plantaris sartorius gracilis |
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What are the actions of the Popliteus?
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-knee flexion + outward rotation
may help prevent hyperextension -prone to injury in forceful slamming into hyperextension |
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What do the Gastrocnemeus and Plantaris do?
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initiate knee flexion (particularly from locked position)
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What does the Sartorius do (at the knee)?
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knee flexion, inward rotation
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What is a common cause of knee injury?
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imbalance of strength between quads and hamstrings
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Why do we get hamstring tears?
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common due to numbers of stretch receptors (b/c antigravity muscles)
-more prone to contracting during movement ranges that place them in stretch -may be slower to deactivate |
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What happens in Plantaris and Popliteus tears?
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-Plantaris: feel and hear loud pop in mid-calf, followed by pain and loss of function. caused by quick changes in movement
Popliteus: caused by forceful hyperextension |
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Of the hamstrings group, list one muscle that inwardly rotates the knee and one tha outwardly rotates the knee.
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Inward - Semimembranosis or Semitendinosis
Outward - Biceps femoris |
