Week 5: knee movement

Question 1

Convex-concave rules

Answer 1

femur joint surface is moving the roll and glide occur in opposite directions

tibia joint surface is moving the roll and glide occur in the same directions

Question 2

Unlocking the knee

Answer 2

popliteus “unlocks” the knee by medially rotating tibia

Question 3

importance of screw home mechanism

Answer 3

• Contributes to tibiofemoral joint stability in extension
• Close packed position

Question 4

Patella movements

Answer 4

• Extension: the patella is not in contact with the trochlear groove
• 10-20° of knee flexion: the inferior margin of patella articulates with trochlear groove of femur

Question 5

Static stability of knee joint

Answer 5

combination of non contractile and bony elements

Question 6

Static stability of knee joint examples

Answer 6

meniscus, ligaments, capsule, articular cartilage, ITB

Question 7

Dynamic stability of knee joint

Answer 7

muscles acting on or across the knee joint

Question 8

Dynamic stability of knee joint examples

Answer 8

quadriceps, hamstrings, sartorius, TFL, gracilis, gastrocnemius, popliteus, ITB

Question 9

Medial meniscus attatchments

Answer 9

• Medial collateral ligament
• Anterior and posterior cruciate ligaments
• Semimembranosus

Question 10

Lateral meniscus attatchments

Answer 10

• Posterior cruciate ligament
• Medial femoral condyle via meniscofemoral ligament
• Popliteus