Ligament, anterior cruciate
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the knee joint. The anterior cruciate ligament (cruciate means shaped like a cross) is in the front, as indicated here: {{}}The knee is a joint which has three parts. The thigh bone (femur) meets the large shin bone (tibia) forming the main knee joint. This joint has an inner (medial) and an outer (lateral) compartment. The kneecap (patella) and the femur form a third joint, called the patellofemoral joint. The meniscus is a c-shaped cartilage pad between the two joints formed by the femur and tibia. The meniscus acts as a smooth surface for the joint to move on. The knee joint is surrounded by fluid-filled sacs called bursae, which serve as gliding surfaces that reduce friction of the tendons. Below the kneecap, there is a large tendon (patellar tendon) which attaches to the front of the tibia bone. There are large blood vessels passing through the area behind the knee (referred to as the popliteal space). The large muscles of the thigh move the knee. In the front of the thigh the quadriceps muscles extend the knee joint. In the back of the thigh, the hamstring muscles flex the knee. The knee also rotates slightly under guidance of specific muscles of the thigh. The knee functions to allow movement of the leg and is critical to normal walking. The knee flexes (bends) normally to a maximum of 135 degrees and extends (straightens) to 0 degrees. The bursae, or fluid-filled sacs, serve as gliding surfaces for the tendons to reduce the force of friction as these tendons move. The knee is a weight-bearing joint. Each meniscus serves to evenly load the surface during weight- bearing and also adds in disbursing joint fluid for joint lubrication.

Medical dictionary. 2011.

Look at other dictionaries:

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  • anterior cruciate ligament — n a cruciate ligament of each knee that is attached in front to the more medial aspect of the tibia, that passes upward, backward, and laterally through the middle of the knee crossing the posterior cruciate ligament to attach to the femur, that… …   Medical dictionary

  • Anterior cruciate ligament injury — Infobox Disease Name = PAGENAME Caption = Diagram of the right knee Width = 300 DiseasesDB = ICD10 = ICD10|S|83|5|s|80 ICD9 = ICD9|844.2 ICDO = OMIM = MedlinePlus = eMedicineSubj = pmr eMedicineTopic = 3 MeshID = An injury to the anterior… …   Wikipedia

  • Cruciate ligament, anterior — The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the… …   Medical dictionary

  • Anterior cruciate ligament (ACL) — One of the ligaments in the knee, the ACL crosses from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in the lower leg). ACL injuries can occur in a number of situations including sports such as football, can …   Medical dictionary

  • anterior cruciate ligament — noun Date: 1974 a cruciate ligament of each knee that attaches the front of the tibia with the back of the femur and functions especially to prevent hyperextension of the knee and is subject to injury especially by tearing called also ACL …   New Collegiate Dictionary

  • anterior cruciate ligament — noun See cruciate ligament …   Australian English dictionary

  • anterior cruciate ligament — noun : a cruciate ligament of each knee that is attached in front to the more medial aspect of the tibia, that passes upward, backward, and laterally through the middle of the knee to attach to the femur, that functions to prevent hyperextension… …   Useful english dictionary

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