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