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11 Cards in this Set

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What are the (4) Knee Extensors?
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)
What do the knee extensors have to do with patellar tracking?
-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
What are the (3) Knee Flexors?
biceps femoris (+ outward rotation)

semimembranosis (+ inward rotation)
semitendonosis (+ inward rotation)
What are the (5) minor knee flexors?
popliteus
gastrocnemeus
plantaris
sartorius
gracilis
What are the actions of the Popliteus?
-knee flexion + outward rotation
may help prevent hyperextension

-prone to injury in forceful slamming into hyperextension
What do the Gastrocnemeus and Plantaris do?
initiate knee flexion (particularly from locked position)
What does the Sartorius do (at the knee)?
knee flexion, inward rotation
What is a common cause of knee injury?
imbalance of strength between quads and hamstrings
Why do we get hamstring tears?
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
What happens in Plantaris and Popliteus tears?
-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
Of the hamstrings group, list one muscle that inwardly rotates the knee and one tha outwardly rotates the knee.
Inward - Semimembranosis or Semitendinosis
Outward - Biceps femoris