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Detailed picture of your knee joint

Detailed picture of your knee joint. Collateral ligaments The lateral collateral ligament strengthens the knee joint on the outer side of the knee. It runs between your thigh bone (femur) and the top of your fibula — the long, thin bone on the outside of your main shin bone.

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Detailed picture of your knee joint

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  1. Detailed picture of your knee joint

  2. Collateral ligamentsThe lateral collateral ligament strengthens the knee joint on the outer side of the knee. It runs between your thigh bone (femur) and the top of your fibula — the long, thin bone on the outside of your main shin bone. • The medial collateral ligament strengthens the knee joint on the inner side of the knee. It runs between your femur and the upper inside edge of your shin bone (tibia). • Together the collateral ligaments resist side-to-side movement of the knee joint and help prevent rotation between your thigh bone and your shin.

  3. The lateral collateral ligament can be torn when your knee twists, is hit on the inner side, or is forced outwards while your foot is pushed inwards. A lateral collateral ligament tear rarely occurs on its own, and usually accompanies a tear to other knee ligaments. • Tears to the medial collateral ligament are relatively common and can arise from a direct hit to your knee, twisting of your knee, or a force that pushes your foot outwards and your knee inwards.

  4. Cruciate ligamentsThe cruciate ligaments are short strong bands of fibrous tissue that cross each other inside your knee joint and join your tibia to your femur. They are named according to where they attach on the top of the tibia. • The anterior cruciate ligament (ACL) runs from the front of your tibia, backwards and slightly outwards, to the base of your femur. This ligament stops your shin bone from moving forwards in front of your thigh bone. • The posterior cruciate ligament (PCL) runs from the rear of your tibia, forwards and slightly inwards, to the base of your femur. This ligament stops your shin bone from moving backwards, relative to your thigh bone. It is generally stronger than the ACL.

  5. Tearing of the anterior cruciate ligament is a very common sporting injury. An ACL tear can happen when you change direction rapidly, slow down when running, land after a jump, or receive a direct blow to your knee. • Injuries to the posterior cruciate ligament are less common. They can result if your knee is over-straightened or over-flexed (bent too strongly), or the shin is forced backwards. • A tear of the anterior cruciate ligament tends to be a more serious injury than an equivalent tear to any of the other knee ligaments, as joint stability is more profoundly affected, and surgery is often necessary. • Partial or even complete tears of the posterior cruciate or the collateral ligaments can often heal with a prescribed rehabilitation programme. However, if more than one ligament is injured, surgery is often needed.

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