Knee Joint
what provides dynamic stability to the knee joint
hamstrings and quadriceps
what injury often occurs in sports with squatting, twisting, or direct contact
menisci
what connects the fibula and femur and is not often injured
LCL
Which two connective tissue structures serve to cushion the knee joint?
Lateral meniscus Medial meniscus
what injury occurs often in contact sports when the opponent falls against the lateral aspect of knee causing medial opening and stress on this ligament
MCL
What are the four primary ligaments that provide for stability of the knee joint?
Medial collateral Anterior cruciate Posterior cruciate Lateral collateral
The semimembranosus and semitendinosus both rotate the knee internally because
They have posterior origin AND a medial insertion
what muscles are innervated by femoral nerve
anterior muscles: rectus femoris, vastus intermedius, vastus lateralis, vastus medialis
which menisci is more frequently torn and why
medial, lateral meniscus moves well with flexion/extension and medial is stationary making it more prone to injury
muscles involved in internal rotation
popliteus, semimebranosus, semitendinosus
other name for knee joint
tibiofemoral joint
The semitendinosus, semimembranosus, biceps femoris, and popliteus all flex the knee because they cross the knee joint and are located on the posterior side of the leg. true/false
true
The anterior muscles of the knee joint cannot internally or externally rotate the knee because their insertions are neither medial or lateral enough. true/false
true (nothing anterior is located medial/lateral enough)
what injury occurs from hyperextension of knee or violent contraction causing quads to pull tibia forward on femur and is the most common ligament injury
ACL injury
The rectus femoris is the only muscle of the knee joint that also flexes the hip. Why do the vastus lateralis, vastus medialis and vastus intermedius not flex the hip?
Because they originate on the femur and therefore do not cross the hip joint
MCL prevents the knee from what
abducting
what muscles are innervated by sciatic nerve
biceps femoris, semimebranosus, semitendinosus
muscles involved in external rotation
biceps femoris
what injury occurs from direct contact during sports but is not commonly injured
PCL
menisci also do what to the knee joint
deepens the tibial plateau making joint more stable
muscles involved in knee flexion
biceps femoris, semimebranosus, semitendinosus, popliteus
tibiofemoral is what type of joint
ginglymus/hinge
The rectus femoris, vastus lateralis, vastus intermedius and vastus medialis all extend the knee because they originate somewhere on the femur. true/false
false
what muscles are innervated by tibial nerve
popliteus
muscles involved in knee extension
rectus femoris, vastus intermedius, vastus lateralis, vastus medialis
The tibiofemoral joint permits movement in which planes?
sagittal
bones of knee joint
tibia, femur, patella (fibula part of attachment sites)
ACL injury occurs more often in men or women
women
