Anterior cruciate ligament injury is typified by a sudden, painful, audible pop noise. The patient is typically unable to return to the ongoing sporting activity, and presents with joint instability, and rapid development of an effusion (haemarthrosis).
Often tender at lateral femoral condyle, lateral tibial plateau, and tibiofemoral joint lines.
A positive Lachman's test is most accurate right after the injury and the pivot shift test is more useful in sub-acute or chronic cases.
History and physical examination usually provide an accurate diagnosis.
X-rays obtained to rule out avulsion fractures or other related conditions, but do not directly identify ACL injury. Magnetic resonance imaging delineates ACL tears, along with associated injury to the menisci and other structures.
Initial treatment for most patients consists of protection, rest, ice, compression, elevation, and analgesia (as appropriate). Subsequent treatment varies by an individual patient's health and fitness status and goals. Treatment may range from minimal or no additional intervention to bracing, physiotherapy, and activity modification, and to surgical reconstruction (either early or delayed).
A torn anterior cruciate ligament (ACL) usually occurs as a result of an acute non-contact deceleration injury, forceful hyperextension, or excessive rotational forces about the knee. The ligament may be completely torn, partially torn, or avulsed from its origin or insertion. The ACL is the primary restraint to excessive anterior translation and rotation of the tibia on the femur; therefore, complete ACL disruption typically results in dynamic knee instability or the inability to respond to quick changes in position.
History and exam
- acute trauma
- female sex (after puberty)
- poor technique for landings
- history of previous ACL injury
- aggressive athlete with higher skill level
- use of cleats or spikes
- rough or uneven playing surface
- ground condition/weather
- adolescent, young adults, and middle-aged athletes
Philip H. Cohen, MD
Clinical Assistant Professor of Medicine
Robert Wood Johnson Medical School
University of Medicine and Dentistry of New Jersey
PHC has been reimbursed by MCE Conferences for providing lectures and workshops in sports medicine.
James C. Puffer, MD
University of Kentucky School of Medicine
President and Chief Executive Officer
American Board of Family Medicine
JCP declares that he has no competing interests.
Jung-Ro Yoon, MD
Department of Orthopedic Surgery
Seoul Veterans Hospital
JRY declares that she has no competing interests.
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