Anterior cruciate ligament - wikipedia Anterior cruciate ligament This article is about the ligament. For the computer permissions list, see Access control list. Anterior cruciate ligament Diagram of the right knee. Anterior cruciate ligament labeled at center left. Details From lateral condyle of the femur To intercondyloid eminence of the tibia Identifiers Latin ligamentum cruciatum anterius Dorlands / Elsevier l_09 / 12492099 TA A03. 6.08. 007 FMA 44614 Anatomical terminology ( edit on Wikidata ) The anterior cruciate ligament ( ACL ) is one of a pair of cruciate ligaments ( the other being the posterior cruciate ligament ) in the human knee. The two ligaments are also called cruciform ligaments, as they are arranged in a crossed formation. In the quadruped stifle joint ( analogous to the knee ), based on its anatomical position, it is also referred to as the cranial cruciate ligament. The anterior cruciate ligament is one of the four main ligaments of the knee, providing 85 % of the restraining force to anterior tibial displacement at 30 degrees and 90 degrees of knee flexion. Contents 1 Structure 2 Purpose 3 Clinical significance 3.1 Injury 3.2 Non-operative treatment of the ACL 3.2. 1 ACL injuries in women 4 Additional images 5 See also 6 References 7 External links Structure The ACL originates from deep within the notch of the distal femur. Its proximal fibers fan out along the medial wall of the lateral femoral condyle. There are two bundles of the ACL : the anteromedial and the posterolateral, named according to where the bundles insert into the tibial plateau. ( The tibia plateau is a critical weight - bearing region on the upper extremity of the tibia ). The ACL attaches in front of the intercondyloid eminence of the tibia, where it blends with the anterior horn of the lateral meniscus. Purpose These attachments allow the ACL to resist anterior translation and medial rotation of the tibia, in relation to the femur. Clinical significance Injury MRI of anterior cruciate ligament tear Main article : Anterior cruciate ligament injury An ACL tear is one of the most common knee injuries, with over 100,000 tears occurring annually in the US. Most ACL tears are a result of landing or planting in cutting or pivoting sports, with or without contact. Because the ACL is crucial for stabilizing the knee when turning or planting, most serious athletes will require an ACL reconstruction if they have a complete tear and want to return to sports. Reconstruction is most commonly done by autograft, meaning the tissue used for the repair is from within the patient 's body. Cadavers may also be utilized for tissue. The two most common sources for tissue are the patellar tendon and the hamstrings tendon. The surgery is arthroscopic, meaning that a tiny camera is inserted through a small surgical cut. The camera sends video to a large monitor so that the surgeon can see any damage to the ligaments. In the event of an autograft, the surgeon will make a larger cut to get the needed tissue. In the event of an allograft, in which material is donated, this is not necessary. The surgeon will make holes in the patient 's bones to run the new tissue through, and that tissue serves as the patient 's new ACL. Recovery time ranges between one and two years or longer. A week or so after the occurrence of the injury, the athlete is usually deceived by the fact that he / she is walking normally and not feeling much pain. This is dangerous as some athletes start resuming some of their activities such as jogging which, with a wrong move or twist, could damage the bones. It is important for the injured athlete to understand the significance of each step of an ACL injury to avoid complications and ensure a proper recovery. Tearing the anterior cruciate ligament can sometimes be part of a knee injury known as `` the terrible triad ''. This consists of the simultaneous tearing of the anterior cruciate ligament ( ACL ), medial collateral ligament ( MCL ) and medial meniscus. Non-operative treatment of the ACL The ACL can be treated non operatively with strengthening and rehabilitation when the ACL is not completely torn and the knee is still stable or if the patient is not doing activities requiring cutting and pivoting or similar actions. The mainstay of ACL non-operative treatment is strengthening of the muscles around the knee, especially the hamstrings. Focused therapy supervised by a physical therapist can be an effective way to accomplish this. Anterior cruciate ligament surgery is a complex operation that requires expertise in the field of orthopedic and sports medicine. Many factors should be considered when discussing surgery including the athlete 's level of competition, age, previous knee injury, other injuries sustained, leg alignment and graft choice. Occasionally, stimulation of the body 's natural ability to heal the native ligament, called a `` healing response '', is relied upon. More commonly, the ligament must be replaced by a graft from the patient 's own tissue or tissue from a cadaver. Graft choice could be confusing, requiring expert counseling from a doctor. Rehabilitation is crucial to any ACL surgery ; complete recovery and return to sports or other activities typically takes six to nine months. Revision ACL surgery will often take nine months to more than a year. During this time, the physical therapist should guide the patient through the rehabilitation process. The early rehab, usually lasting around six weeks, focuses on maintaining full knee motion and preventing scar tissue. The second phase of rehab is directed toward regaining knee strength. Finally, activity - specific rehabilitation is administered. The rehabilitation program can also be composed of aggressive motions and weight - bearing exercises. If the doctor recommends surgery for ACL, he or she may prescribe `` prehab '' before operating, as many studies have shown that inducing good motion before the surgery will benefit the patient during recovery. A 2010 Los Angeles Times review of two medical studies discussed whether ACL reconstruction was advisable. One study found that children under 14 who had ACL reconstruction fared better after early surgery than those who underwent a delayed surgery. But for adults 18 to 35, patients who underwent early surgery followed by rehabilitation fared no better than those who had rehabilitative therapy and a later surgery. The first report focused on children and the timing of an ACL reconstruction. ACL injuries in children are a challenge because children have open growth plates in the bottom of the femur or thigh bone and on the top of the tibia or shin. An ACL reconstruction will typically cross the growth plates, posing a theoretical risk of injury to the growth plate, stunting leg growth or causing the leg to grow at an unusual angle. The second study noted in the L.A. Times piece focused on adults. It found no significant statistical difference in performance and pain outcomes for patients who receive early ACL reconstruction vs. those who receive physical therapy with an option for later surgery. This would suggest that many patients without instability, buckling or giving way after a course of rehabilitation can be managed non-operatively. However, the study points to the need for more extensive research, was limited to outcomes after two years and did not involve patients who were serious athletes. Patients involved in sports requiring significant cutting, pivoting, twisting or rapid acceleration or deceleration may not be able to participate in these activities without ACL reconstruction. The randomized control study was originally published in the New England Journal of Medicine. ACL injuries in women Women have been known to suffer ACL injuries more frequently than men ; current research gives some explanations for this. The joint through which the anterior cruciate ligament passes, along with the actual size of the anterior cruciate ligament, is significantly smaller in women than in men. This makes it more susceptible to damage. Along with these aspects, women tend to not activate their hamstring muscles as much as their male counterparts during certain cutting movements causing less stability in the knee joint. In addition, the quadriceps angle, or Q - angle, between the anterior superior iliac spine and patellar ligament may contribute to the predisposition of ACL tears. There is some evidence that suggests since women are known to have larger Q - angles than their male counterparts, they might be more susceptible to ACL tears. Additional images Right knee - joint, from the front, showing interior ligaments. Left knee - joint from behind, showing interior ligaments. Head of right tibia seen from above, showing menisci and attachments of ligaments. Capsule of right knee - joint ( distended ). Posterior aspect. MRI shows normal signal of both cruciate ligaments ( arrows ). Knee joint. Deep dissection. Anteromedial view. See also This article uses anatomical terminology ; for an overview, see Anatomical terminology. Anterior cruciate ligament reconstruction Anterior drawer test Anterolateral ligament Lateral collateral ligament Medial collateral ligament Posterior cruciate ligament Unhappy triad References Jump up ^ `` Canine Cranial Cruciate Ligament Disease '' ( PDF ). Melbourne Veterinary Referral Centre. pp. 1 -- 2. Archived from the original ( PDF ) on 19 July 2008. Retrieved September 8, 2009. Jump up ^ Ellison A, Berg E. Embryology, anatomy, and function of the anterior cruciate ligament. Orthop Clin North Am 1985 ; 16 : 3 - 14. PubMed Abstract Jump up ^ `` The Unhappy Triad ''. Archived from the original on December 3, 2012. Retrieved December 12, 2012. ^ Jump up to : Stein, Jeannine ( 2010 - 07 - 22 ). `` Studies on ACL surgery ''. The Los Angeles Times. Archived from the original on July 28, 2010. Retrieved 2010 - 07 - 23. Jump up ^ `` ACL Tears : To reconstruct or not, and if so, when ? ''. howardluksmd.com. Retrieved 2010 - 07 - 23. Jump up ^ Frobell, Richard B. ; Roos, Ewa M. ; Roos, Harald P. ; Ranstam, Jonas ; Lohmander, L. Stefan ( 2010 ). `` A Randomized Trial of Treatment for Acute Anterior Crut Tears ''. New England Journal of Medicine. 363 ( 4 ) : 331 -- 342. doi : 10.1056 / NEJMoa0907797. PMID 20660401. Jump up ^ `` ACL Injuries in Women ''. Retrieved December 12, 2012. External links Anatomy photo : 17 : 02 - 0701 at the SUNY Downstate Medical Center - `` Extremity : Knee joint '' Anatomy figure : 17 : 07 - 08 at Human Anatomy Online, SUNY Downstate Medical Center - `` Superior view of the tibia. '' Anatomy figure : 17 : 08 - 03 at Human Anatomy Online, SUNY Downstate Medical Center - `` Medial and lateral views of the knee joint and cruciate ligaments. '' lljoints at The Anatomy Lesson by Wesley Norman ( Georgetown University ) ( antkneejointopenflexed ) Joints and ligaments of the human leg Hip femoral ( iliofemoral pubofemoral ischiofemoral ) head of femur transverse acetabular acetabular labrum capsule zona orbicularis Knee Tibiofemoral Capsule Anterior meniscofemoral ligament Posterior meniscofemoral ligament extracapsular : popliteal oblique arcuate collateral medial / tibial fibular / lateral intracapsular : cruciate anterior posterior menisci medial lateral transverse anterolateral Patellofemoral Patellar ligament Infrapatellar fat pad Tibiofibular Superior tibiofibular anterior of the head of the fibula posterior of the head of the fibula Inferior tibiofibular Anterior tibiofibular Posterior tibiofibular Interosseous membrane of leg Foot Talocrural and ankle medial : medial of talocrural joint / deltoid anterior tibiotalar posterior tibiotalar tibiocalcaneal tibionavicular lateral : lateral collateral of ankle joint anterior talofibular posterior talofibular calcaneofibular Subtalar / talocalcaneal anterior / posterior lateral / medial interosseous Transverse tarsal Talocalcaneonavicular dorsal talonavicular plantar calcaneonavicular / spring bifurcated ( calcaneonavicular ) Calcaneocuboid dorsal calcaneocuboid long plantar plantar calcaneocuboid bifurcated ( calcaneocuboid ) Distal intertarsal Cuneonavicular plantar dorsal Cuboideonavicular plantar dorsal Intercuneiform plantar dorsal interosseous Other Tarsometatarsal / Lisfranc plantar dorsal Intermetatarsal / metatarsal plantar dorsal interosseous superficial transverse deep transverse Metatarsophalangeal plantar collateral Interphalangeal plantar collateral Arches Longitudinal Transverse Retrieved from `` https://en.wikipedia.org/w/index.php?title=Anterior_cruciate_ligament&oldid=814974795 '' Categories : Knee ligaments Hidden categories : Medicine infobox template using GraySubject or GrayPage Medicine infobox template using Dorlands parameter All articles with unsourced statements Articles with unsourced statements from March 2017 Talk Contents About Wikipedia Български Català Deutsch Español فارسی Français Interlingua Italiano Latina Nederlands 日本 語 Polski Português Simple English Slovenščina 中文 Edit links This page was last edited on 12 December 2017, at 00 : 13. 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Question: where is the acl located in the leg
Answer: knee