Patellofemoral joint

Question 1

patella rests in _ of the femur

Answer 1

trochlea

Question 2

patella movement

Answer 2

extremely mobile

Question 3

main function of patellofemoral joint

Answer 3

increase leverage of quadriceps muscles and protect anterior knee joint

Question 4

what can be found on the posterior aspect of patella?

Answer 4

thick articular cartilage

Question 5

what type of joint is the patellofemoral joint

Answer 5

gliding

Question 6

DOF of patellofemoral joint

Answer 6

2 DOF

Question 7

movements found at patellofemoral joint

Answer 7

superior/inferior glide (associated with knee flexion/extension)

medial/lateral movement

Question 8

static restraints (ligaments) of patellofemoral joint (4)

Answer 8

1. patellofemoral ligaments
2. patellotibial ligaments
3. medial retinaculum
4. lateral retinaculum

Question 9

2 parts of the patellofemoral ligaments and functions

Answer 9

1. medial: primary restraint against lateral inferior patellar displacement
2. lateral: primary restraint against medial inferior patellar displacement

Question 10

medial retinaculum function

Answer 10

prevents lateral displacement

Question 11

lateral retinaculum function

Answer 11

prevents medial displacement

Question 12

patellofemoral joint: which structures are usually stronger and tighter

Answer 12

lateral structures

Question 13

dynamic restraints of patellofemoral joint (6)

Answer 13

1. vastus lateralis
2. vastus medialis
3. vastus intermedius
4. rectus femoris
5. quadriceps tendon
6. infrapatellar tendon

Question 14

when the quadriceps contract concentrically, which muscle is stronger than the other?

Answer 14

VL > VM

Question 15

during extension, how does the patella move?

Answer 15

superiorly and laterally

Question 16

during flexion, how does the patella move?

Answer 16

inferiorly and medially

Question 17

excessive lateral tracking of patella is implicated in what pain syndrome?

Answer 17

patellofemoral pain syndrome (J-sign)

Question 18

in full extension, the patella moves out of contact with

Answer 18

trochlear groove

Question 19

stages and degrees of flexion and its contact

Answer 19

10-20: initial contact, medial and lateral facets

30-70: medial facet

70-90 all portions except odd facet

> 90: odd facet contact

Question 20

which facet gets most contact overall during flexion

Answer 20

medial facet

Question 21

degeneration of cartilage on posterior patella can occur from

Answer 21

joint reaction forces