Download THE KNEE JOINT

Review of the Knee Joint
Name the ligament
Name the muscle and its action(s)
Semitendinosus
• Action:
– Flexion of the knee
– Internal rotation of the knee
1. Vastus Medialis
1.
2. Rectus Femoris
2.
3. Vastus Lateralis
3.
Tibia & Fibula
? = Medial condyle
? = Lateral condyle
? = Head of fibula
Name the muscle and its action
Sartorius
Action: Flexion at the
knee
Name the muscle and its action(s)
Semimembranosus
• Action:
– Flexion of the knee
– Internal rotation of the knee
1. Anterior cruciate
ligament
2. Lateral collateral
ligament
3. Lateral meniscus
4. Posterior cruciate
ligament
5. Medial collateral
ligament
6. Medial meniscus
1.
4.
2.
5.
3.
6.
Name the muscle and its
action
Popliteus
• Action:
– Flexion of knee
– Internal rotation of the knee
1 = Lateral Meniscus
2 = Patella
3 = Medial meniscus
1.
3.
2.
Name the colored muscles
• Vastus
medialis
• Rectus
femoris
2
1
• Vastus
lateralis
3
?=
?=
?=
Lateral condyle
Medial condyle
Intercondylar fossa
Femur
Name the muscle and its action
Gracilis
Action - flexion at the knee
2.
1.
3.
1.
= 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
1.
2.
3.
3.
4.
1. = Anterior cruciate ligament
2. = Lateral collateral
3. = Lateral meniscus
3. = Medial collateral
4. = Medial mieniscus
Name the muscles.
1 = Vastus lateralis
2 = Vastus intermedius
1.
2.
3.
3 = Vastus medialis
? = Head
?=
Lateral malleolus
Fibula
Name the muscles
1. Semitendonosis
2. Biceps femoris
3. Semimembranosi
s
1.
2.
3.
Name the muscle and its
action
Biceps femoris
• Action:
– Flexion of knee
– External rotation of the knee
? = Medial condyle
? = Lateral condyle
? = Tibial tuberosicty
Tibia
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.
1.
2.
1 = Lateral meniscus
2 = Medial meniscus
Femur
1. Medial condyle
2. Lateral condyle
3. Intercondylar fossa
Name the muscle and its action(s)
Popliteus
• Action:
– Flexion of the knee
– Internal rotation of the knee
Tibia
1.
2.
1.
2.
Lateral condyle
Medial condyle
Name the muscle and its
action
Biceps femoris
Action:
Flexion of knee
External rotation of the knee
Fibula
Head
Proximal
Distal
Head
Name the muscles and
its action
1. Vastus lateralis
2. Vastus intermedius
3. Vastus medialis
• Action:
– Extension of the knee
1.
2.
3.
LIGAMENTS
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
ACL
Lat. Collat.
Lat. Men.
PCL
Med.
Collat.
6. Med. Men.
Meniscus
1
4
2
3
1.
2.
3.
4.
ACL
Lateral men.
PCL
Medial men.
Name the muscle and its
action
Rectus femoris
• Action:
– Extension of knee
QUESTIONS?