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The Knee

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Alyssa Theodore

on 11 September 2014

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Transcript of The Knee

Anatomy of the Knee
Iliotibial Band (ITB)
The IT band and its associated muscles stabilize the knee laterally when extending, abducting, and laterally rotating the hip.
- During extension, the ITB moves forward (anterior), while flexion moves the ITB backward (posterior).
Lateral Patellar Retinaculum
- Connects the knee cap (patella) to the tibia on the medial side and lateral side for overall support and lateral movement of patella
Quadriceps Tendon and Patellar Tendon
The Quadriceps muscles are attached to the patella by the Quadriceps tendon
The patella attaches to the tibia by the Patellar tendon and work in unison to straighten the knee.

Pes Anserinus (Sartorius, Gracilis, and Semitendinosus Tendon)
-The three tendons make up the inner medial tissue on the knee, and flexes the leg at knee joint.
The Sartorius action weakly flexes, abducts and laterally rotates thigh at hip joint.
The Gracilis adducts thigh at hip joint, and medially rotates thigh.
Semitendinosus extends thigh at hip joint.
Ligaments (4 Main Ligaments)
The Knee is the largest joint in the body. Bones are connected through ligaments and Muscles attach to bones by Tendons.

Kneed any more information?

The Anterior Cruciate Ligament
The Posterior Cruciate Ligament
The Lateral Collateral Ligament
The Medial Collateral Ligament
Muscles supporting the Knee
- Rectus femoris; extention at knee joint,flexion at hip joint
- Vastus medialis; extention at knee joint
- Vastus laterials; extention at knee joint
- Vastus intermedius; extention at knee joint
Anterior Bones
Interior Bones
Anterior View of Knee Bone:

Patella of Knee:

Posterior (and Interior) View of Knee Bone:

Anterior View of Knee Ligaments:

Meniscus Images:
(Posterior View)
-inside the knee joint
-assists in stabilizing knee joint in backward and forward movements of knee

-on outside of knee joint
-assists in protection & stabilization from trauma occurring on inner side of knee
-limits side to side movement
-inside the knee joint
-assists in controlling forward and backward movements of knee
-on outside of knee joint
-assists in protection and stabilization from trauma occurring on outer side of knee
-limits side to side movement
-Ligament most prone to injury
-The medial and lateral meniscus distribute pressure onto the joint surfaces (soften trauma), and assist in nourishment and lubrication of joint.
Tendon Information:
Neilsen, M., & Tortora, G. (2012). Principles of Human Anatomy.John Wiley & Sons, Inc.



Muscle Information:
3dmedical.2013.Muscle System Pro III.Retrieved from http://itunes.apple.com


- Dense connective tissues that connect muscle to bone
- Biceps Femoris; flexion and external rotation at knee
- Semitendononus; flexion and internal rotation at knee joint, extension at hip

Muscles Surrounding Knee joint
- Popliteus; flexion and internal rotation at knee
- Plantaris; flexion of knee & plantar flexion
Hip Muscles influence on Knee
-Gracilis; flexion and internal rotation of knee
-Sartorious; flexion and internal rotation of knee

Nerve Innervation
- All extensors are innervated by the
femoral nerve
(L2-L4) as well as sartorius (flexor)
- All flexors except for sartorius are innervated by the
tibial nerve
-The gracilis is innervated by the
obturator nerve

Other muscles influencing the Knee
-Gastrocnemius; flexion at knee and planter flexion at Talocrural
(Nielsen, 2012, pg 417)
Full transcript