0:00 Anatomy of the Knee
The video shows the ligaments of the knee.
Muscles that act on the knee are:
Quadriceps - Knee extension
Rectus femoris - hip flexion,knee extension
Vastus lateralis - knee extension, pulls patella laterally
Vastus intermedius - knee extension
Vastus medialis - knee extension, pulls patella medially - distal fibers (Vastus Medialis Obliqus) help with last 15 degrees of extension
Semimembranosis - hip extension, knee flexion, internal tibial torsion
Semitendonosis - hip extension, knee flexion, internal tibial torsion
Biceps Femoris - hip extension, knee flexion, external tibial torsion
Gastrocnemius - Knee flexion
Tensor Fascial Lata, Gluteus Maximus - through Iliotibial Band will help cause lateral torsion
Sartorius, Semitendonosis, Gracilis - these three muscles cross at the medial side of the knee and attach at the pes anserinus (goose foot) area of the tibia. They help to give stability to the medial side of the knee. These three muscles come from three widely separated orgins on the three bones of the innominate (ilium, ischium and pubis) so they can act as inverted guy wires to stabilize the medial knee. Their common attachment on the medial tibia reminded early anatomists of a goose foot, so thay gave it the name pes anserinus, which is latin for goose foot.
Polpliteus - originates on the lateral femoral epicondyle and inserts on the posterior surface of the tibia. It can help to flex the knee and rotate the tibia internally.
Plantaris - originates on the lateral supracondylar ridge of the femur. Its has a long tendon that goes down the medial side of the soleus muscle and merges into the achilles tendon. It helps to flex the knee.
1:44 Medial Collateral Ligament - Valgus Stress Test
3:12 Lateral Collateral Ligament - Varus Stress Test
4:03 Anterior Cruciate Ligament - Anterior Drawer Test
4:52 Posterior Cruciate Ligament - Posterior Drawer Test
5:09 Anterior Cruciate Ligament - Lachmnan Test
5:31 Meniscus - McMurray's Test
6:59 Meniscus - Apley Compression Test
7:25 MCL, LCL - Apley Distraction Test
7:59 Patellofemoral Compression Test
8:42 Tibial Torsion
I wish to thank James Waslaski for the information on Tibial Torsion. I highly recommend his orthopedic massage workshops and his excellent DVD on knee pain. www.orthomassage.net
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