Stephen J. Schueler, M.D.

Ligament Knee Injury Anatomy

To better understand a knee sprain, it helps to understand the anatomy of the knee joint.

Three bones come together at the knee joint:

  • Femur:
    • Thighbone
    • Articulates with hip joint above and knee joint below
    • The femur and tibia form the major portion of the knee joint,
  • Tibia:
    • Thick bone in the front of the lower leg or shin
    • The tibia supports all of the body's weight below the knee joint.
  • Patella:
    • Kneecap
    • The patella protects the front of the knee joint.
    • Connected by tendons above and below

Knee Tendons
The tendons are strong fibrous bands that connect the muscles to bone.

The knee tendons include:
  • Quadriceps tendon:
    • Attaches the quadriceps muscle to the kneecap
  • Patellar tendon:
    • Attaches the patella to the tibia
  • Popliteus tendon:
    • Extends from the outer bottom surface of the femur and travels diagonally behind the knee to attach to the inner upper surface of the tibia.
  • Hamstring tendons:
    • Attach the hamstring muscles to the tibia
  • Calf tendons:
    • Attach the calf muscles to the femur

Knee Ligaments
Strong fibrous bands, called ligaments, support the knee. Injuries to the knee ligaments are common.

The knee ligaments include:
  • Lateral collateral ligament:
    • Stabilizes the knee from stress applied to the sides of the knee
  • Medial collateral ligament:
    • Stabilizes the knee from stress applied to the sides of the knee
  • Posterior cruciate ligament:
    • Stabilizes the knee from stress applied to the front or back of the knee
  • Anterior cruciate ligament:
    • Stabilizes the knee from stress applied to the front or back of the knee

Knee Cartilage
Cartilage is a smooth, firm layer of tissue that lines all of the joints in the body. There are two c-shaped discs of cartilage that line the inside of the knee. They keep the knee easy to move and also stabilize the knee during range of motion.

The knee cartilages include:
  • Medial meniscus
  • Lateral meniscus

Last Updated: Dec 17, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
Copyright DSHI Systems, Inc. Powered by: FreeMD - Your Virtual Doctor

PubMed Ligament Knee Injury References
  1. Beynnon BD, Johnson RJ, Abate JA, Fleming BC, Nichols CE. Treatment of anterior cruciate ligament injuries, part 2. Am J Sports Med. 2005 Nov;33(11):1751-67.[16230470]
  2. Beynnon BD, Johnson RJ, Abate JA, Fleming BC, Nichols CE. Treatment of anterior cruciate ligament injuries, part I. Am J Sports Med. 2005 Oct;33(10):1579-602. [16199611]
  3. Boutin RD, Fritz RC. MRI of snow skiing and snowboarding injuries. Semin Musculoskelet Radiol. 2005 Dec;9(4):360-78. [16315118]
  4. Forster MC, Komarsamy B, Davison JN. Distal femoral fractures: a review of fixation methods. Injury. 2006 Feb;37(2):97-108. [16439229]
  5. Khan Z, Faruqui Z, Ogyunbiyi O, Rosset G, Iqbal J. Ultrasound assessment of internal derangement of the knee. Acta Orthop Belg. 2006 Jan;72(1):72-6. [16570898]
  6. Rose NE, Gold SM. A comparison of accuracy between clinical examination and magnetic resonance imaging in the diagnosis of meniscal and anterior cruciate ligament tears. Arthroscopy. 1996 Aug;12(4):398-405.[8863996]
  7. Woo SL, Abramowitch SD, Kilger R, Liang R. Biomechanics of knee ligaments: injury, healing, and repair. J Biomech. 2006;39(1):1-20. [16271583]
FreeMD is provided for information purposes only and should not be used as a substitute for evaluation and treatment by a physician. Please review our terms of use.