Review of the Knee Joint

Name the ligament

Semitendinosus Action: –Flexion of the knee –Internal rotation of the knee Name the muscle and its action(s)

1.Vastus Medialis 2.Rectus Femoris 3.Vastus Lateralis

Tibia & Fibula Medial condyle Lateral condyle Head of fibula? = ? =

Sartorius Action: Flexion at the knee Name the muscle and its action

Semimembranosus Action: –Flexion of the knee –Internal rotation of the knee Name the muscle and its action(s)

1.Anterior cruciate ligament 2.Lateral collateral ligament 3.Lateral meniscus 4.Posterior cruciate ligament 5.Medial collateral ligament 6.Medial meniscus

Popliteus Action: –Flexion of knee –Internal rotation of the knee Name the muscle and its action

= Lateral Meniscus 2 = Patella 3 = Medial meniscus

Vastus medialis Rectus femoris Vastus lateralis Name the colored muscles 1 2 3

Femur ? = Lateral condyle Medial condyle Intercondylar fossa

Gracilis Action - flexion at the knee Name the muscle and its action

= Vastus lateralis 2.= Rectus femoris 3.= Vastus medialis

What is the Q angle? The angle between the line of pull of the rectus femoris and the patellar ligament.

Review Define “screw home” movement. –Locking of the knee during full extension and external rotation. Which type of rotation occurs during “unlocking” of the knee? –Internal rotation and flexion

= Anterior cruciate ligament 2. = Lateral collateral 3. = Lateral meniscus 3. = Medial collateral 4. = Medial mieniscus

Name the muscles = Vastus lateralis 2 = Vastus intermedius 3 = Vastus medialis

Fibula Head Lateral malleolus ? =

1.Semitendonosis 2.Biceps femoris 3.Semimembranosi s Name the muscles

Biceps femoris Action: –Flexion of knee –External rotation of the knee Name the muscle and its action

Tibia Medial condyle Lateral condyle Tibial tuberosicty ? =

Name two functions of the menisci. 1.Stabilization 2.Shock absorption 3.Lubrication

Name the muscle and its action(s) Sartorius Action: Flexion at the knee

Questions What is a uniarticulate muscle? –A muscle that crosses one joint What is a biarticulate muscle? –A muscle that crosses two joints. What is a disadvantage of a biarticulate muscle? –They are weaker during movement at both of the joints.

= Lateral meniscus 2 = Medial meniscus

Femur 1.Medial condyle 2.Lateral condyle 3.Intercondylar fossa

Popliteus Action: –Flexion of the knee –Internal rotation of the knee Name the muscle and its action(s)

Tibia Lateral condyle 2.Medial condyle

Biceps femoris Action: Flexion of knee External rotation of the knee Name the muscle and its action

Fibula Head Proximal Distal

Action: –Extension of the knee Name the muscles and its action 1.Vastus lateralis 2.Vastus intermedius 3.Vastus medialis

LIGAMENTS 1.ACL 2.Lat. Collat. 3.Lat. Men. 4.PCL 5.Med. Collat. 6.Med. Men

Meniscus 1.ACL 2.Lateral men. 3.PCL 4.Medial men

Rectus femoris Action: –Extension of knee Name the muscle and its action

QUESTIONS?