musculature --> knee

Question 1

extensors

Answer 1

quadriceps femoris

–> vastus lateralis, vastus intermedius, vastus medialis, rectus femoris

Question 2

vastus medialis is divided into

Answer 2

vastus medialis longus

vastus medialis oblique

Question 3

where does the VMO insert into the patella

Answer 3

50-55 degree angle

important for patellar tracking

Question 4

how does the muscles attach

Answer 4

converge and insert on the patella via the quadriceps tendon

then the patella is attached to the tibial tubercle via the patellar ligament

Question 5

rectus femoris

Answer 5

2 joint muscle

susceptible to active and passive insufficiencies

Question 6

articularis genu

Answer 6

not an extensor, but important during active knee extension

attaches to the superior knee joint capsule

pulls the synovial membrane of the knee joint upwards to prevent impingement of the suprapatellar pouch b/w the tibiofemoral joint during knee extension

Question 7

felxors

Answer 7

semimembranosus

semitendinosus

biceps femoris

sartorius

gracilis

popliteus

gastrocnemius

Question 8

semimembranosus

Answer 8

deforms medial meniscus posteriorly during knee flexion

Question 9

sartorius

Answer 9

role at the hip more important

Question 10

gracilis

Answer 10

readily becomes actively insufficient

Question 11

popliteus

Answer 11

attaches to the lateral meniscus and will pull the lateral meniscus posteriorly to allow full knee flexion

“unlocks” the knee

Question 12

gastrocnemius

Answer 12

weak knee flexor

effective in preventing knee joint hyperextension

dynamic stabilizer of the knee (especially during final stages of single-limb support during walking)

Question 13

internal rotators of the tibia

Answer 13

semimembranosus

semitendinosus

gracilis

popliteus

sartorius

Question 14

external rotation of the tibia

Answer 14

biceps femoris

TFL (will flex and ER the tibia)

Question 15

gait

Answer 15

primary function of the knee during gait is to adjust the length of the lower extremity to allow ground clearance

during swing phase of gait

Question 16

when will the knee also flex during gait

Answer 16

stance phase

lower the body and lower the body’s center of gravity (makes us more stable)

Question 17

if the LOG is located at a distance from a joint axis

Answer 17

a gravitational moment is created

Question 18

in static standing

Answer 18

want to prevent gravitational moment from casuing movement

Question 19

in gait muscles will

Answer 19

either control the movement or produce the required movement