Patellofemoral joint

Question 1

classify this joint

Answer 1

synovial saddle joint

articulation is between the femoral and patellar articular surfaces

Question 2

what is the function of the patella

Answer 2

improves mechanical efficiency of the quadriceps muscle group by increasing lever arm and increasing angular torque

Question 3

what is the Q angle

Answer 3

defined as angle between quadriceps muscles

measured as angle between line from ASIS to centre patella and line from centre patella to tibial tuberosity

represents angle of quadriceps muscle force

Question 4

give the angles in Q ANGLE

Answer 4

Normal is 13 degrees for men
women 18 degrees
less than or more than is considered abnormal and more than 18 may predispose to patellar lateralisation

Question 5

what is the patella stability dependent on

Answer 5

the patella position alta= too high baja= too low

lateral femoral buttress wall helps the patella to be not taken laterally

ratio between VMO (vistas medals obliques) and VL

tightness of lateral retinaculum

Question 6

Describe the patella articular surface

Answer 6

Oval in shape, covered in thick hyaline cartilage, divided into a large lateral facet, medial facet and small most medial Odd facet

Question 7

Give the direction of movement of the patella during specific knee movement

Answer 7

Knee Flexion - patella moves inferior in the patella groove of the femur
Knee Extension - patella moves superiorly in the patella groove of the femur

Question 8

Describe the location of the patella

Answer 8

Sesamoid bone in the Quadriceps tendon above and patella tendon below on the anterior aspect of the knee