An ACL injury, such as an ACL tear, is among the most common and limiting knee injuries, especially in active people and athletes. It can affect the stability of the joint, make day-to-day movements difficult, and, if not managed well, compromise knee function over time.
What is the anterior cruciate ligament and what is its function?
Knee Anatomy and Joint Stability
The knee is the largest joint in the body. It is made up of the femur, tibia, and patella, and is held together by structures such as the menisci, cartilage, and various ligaments. Between them, the anterior cruciate ligament is located in the center of the joint and crosses with the posterior cruciate ligament, forming an X.
Importance of the anterior cruciate ligament in movement
The anterior cruciate ligament helps control the forward movement of the tibia over the femur and limits excessive rotation of the knee. When injured, the joint loses stability, complicating actions such as running, twisting, or jumping.
Causes and Risk Factors of Anterior Cruciate Ligament Injury
Most common sports injuries: football and basketball
Football and basketball account for a large portion of anterior cruciate ligament rupture cases. These are sports that require speed, changes of pace and direction, and sometimes contact, which increases the risk of this type of injury.
Mechanisms of injury: sharp turns and changes in direction
Most injuries occur without direct contact. Most commonly is a sharp twist with the foot fixed on the ground, a sudden slowdown, or a landing with poor alignment. At the time of injury, many people hear or feel a “pop” in the knee. According to information documented by the American Academy of Orthopaedic Surgeons, about 70% of anterior cruciate ligament tears occur without direct physical contact.
Risk factors in adolescent athletes
Teens, especially during growing outages, are more vulnerable. Factors such as pelvic alignment, knee angle, and muscle strength — particularly in adolescent females — can increase the likelihood of sustaining this injury during sports.
Symptoms of an anterior cruciate ligament tear
Immediate pain and swelling in the knee
After the break, the pain usually comes on right away, and the knee can become inflamed within a few hours. This swelling is due to the accumulation of blood inside the joint, which is known as hemarthrosis.
Feeling unstable and failing joints
It is common for the patient to feel that the knee “gives way” or “goes” when supporting the weight. This feeling of instability is a typical sign that the ligament is no longer fulfilling its supporting function.
Difficulty bearing weight and continuing sports activity
In most cases, it is not possible to continue sports activity. The combination of pain, inflammation, and instability forces you to stop and seek medical evaluation.
Diagnosing Anterior Cruciate Ligament Injury
Physical examination and clinical tests
The orthopedic specialist performs specific maneuvers to assess the ligament. Among the most commonly used are the Lachman test and the anterior drawer test, which help identify an abnormal displacement of the tibia with respect to the femur.
MRI and arthroscopy
Magnetic resonance imaging is the most complete imaging study to confirm the rupture, know its extent and detect associated injuries, such as those involving menisci or cartilage. In certain cases, arthroscopy can be used both to confirm the diagnosis and to treat. The Mayo Clinic indicates that magnetic resonance imaging has a diagnostic accuracy of more than 90% for anterior cruciate ligament injuries.
Evaluation of associated injuries: menisci and cartilage
It is not uncommon for a ruptured anterior cruciate ligament to be accompanied by meniscus injury or joint cartilage damage. Detecting these combined injuries is key to choosing the right treatment.
Classification of anterior cruciate ligament injuries
Partial break vs. full break
These injuries are classified according to the degree of damage. In a partial tear, some fibers are still intact; in a complete tear, the ligament is completely interrupted and completely loses its stabilizing function.
Combined injuries with menisci and other ligaments
When the damage involves, at the same time, the anterior cruciate ligament, the menisci and other ligaments of the knee, it is a combined injury. These are conditions that usually require more detailed surgical planning and longer rehabilitation.
Nonsurgical Treatment of Anterior Cruciate Ligament Injury
When can conservative treatment be indicated?
Management without surgery may be considered in people with low physical demand, older adults, or in cases of partial rupture without marked instability. The decision is based on the patient’s activity level, age, and functional goals.
Physical therapy and rehabilitation without surgery
Physical therapy focuses on regaining range of motion, lowering inflammation, and compensating for missing ligament by strengthening the muscles that stabilize the knee.
Muscle strengthening and recovery of knee stability
Strengthening the quadriceps and hamstrings is essential to gain stability without surgery. Still, in active athletes, this approach rarely allows you to return to the same level prior to injury.
Surgical treatment: anterior cruciate ligament reconstruction
When is surgery recommended?
Surgical reconstruction is usually recommended in young people, athletes, and patients with persistent instability who are looking to resume high-impact activities. It may also be indicated when there are associated injuries to the menisci that need repair.
Reconstruction techniques: autograft vs. allograft
In reconstruction, a graft is placed to replace the damaged ligament. The autograft comes from the patient himself (often from the patellar tendon or hamstrings) and the allograft comes from a donor. The choice depends on the profile and needs of each patient.
Use of patellar tendon and other grafts
The patellar tendon is one of the most widely used grafts due to its resistance and good long-term results. The hamstring and the quadriceps tendon are also used, each with particularities in strength and recovery times. Research published in the British Journal of Sports Medicine supports the use of patellar tendon autograft as an option with a high success rate in active athletes.
Tibial tunnel and femoral tunnel: fixation and procedure
During surgery, two bone tunnels are made: one in the tibia (tibial tunnel) and the other in the femur (femoral tunnel). The graft is passed through them and fixed at both ends with tibial fixation and femoral fixation devices. The correct location of the tunnels is decisive for a good functional result and to reduce the risk of widening of the bone canal.
Arthroscopy in anterior cruciate ligament surgery
Arthroscopy allows the procedure to be performed through small incisions, using a camera and surgical instruments. This technique reduces damage to nearby tissues, usually reduces subsequent pain and promotes a faster recovery.
Recovery and rehabilitation after surgery
Phases of postoperative rehabilitation
Recovery is organized in progressive phases: first, control of pain and inflammation; then, recovery of movement; then, muscle strengthening; and, finally, gradual return to sports activity.
Physical therapy and strengthening exercises
Structured physical therapy is the foundation of rehabilitation. Exercises to strengthen quadriceps, hamstrings, and glutes are essential to protect the graft as it matures and gains stamina.
Recovery times and return to sport
The return to contact or high-demand sports usually occurs between nine and twelve months after surgery. This time can vary depending on the type of graft, the sports level and the consistency with the rehabilitation program.
Sports medicine and specialized follow-up
Follow-up with a sports medicine team helps measure progress with objective criteria, adjust rehabilitation and make safe decisions about returning to activity. At COPAC, the team of orthopedics and traumatology specialists in Panama accompanies each stage of this process with comprehensive and personalized care.
Preventing Anterior Cruciate Ligament Injuries
Preventive Training Programs
There are training programs focused on reducing the risk of anterior cruciate ligament rupture. The FIFA 11+ program is one of the most studied and has been shown to significantly reduce the incidence of these injuries in soccer players: The FIFA 11+ program is one of the most studied and has been shown to significantly reduce the incidence of these injuries in soccer players.
Warm-up and muscle strengthening techniques
A progressive warm-up, along with exercises to strengthen the knee stabilizing muscles, helps reduce the load on the ligament and improves the body’s response to unexpected movements.
Importance of neuromuscular control in athletes
Neuromuscular training teaches the body to react better to risky situations. Working on coordination, balance and jumping and landing technique are key measures to protect the knee.
Special Considerations in Teen Athletes
Anterior cruciate ligament injury with open growth plate
In adolescents with still active physis or growth plates, the surgical approach must be adapted so as not to affect normal bone development. Therefore, careful specialized evaluation is needed.
Age-appropriate surgical techniques
There are technical variants that allow the ligament to be reconstructed while respecting the growth plates. The technique is chosen according to the level of bone maturity of the patient and the experience of the surgical team.
Frequently Asked Questions About Anterior Cruciate Ligament Injury
¿Cuánto tiempo tarda en sanar una rotura del ligamento cruzado anterior?
Healing of the graft inside the bone tunnel takes several months. Although many people return to daily activities within a few weeks, fully returning to high-demand sport usually requires nine to twelve months of supervised rehabilitation.
¿Es posible hacer deporte sin operarse del ligamento cruzado anterior?
In athletes with high demand, playing sport without reconstructing the ligament can increase the risk of episodes of instability and progressive damage to the meniscus and cartilage. Each case should be assessed individually by a specialist.
¿Qué diferencia hay entre autoinjerto y aloinjerto?
Autografting uses the patient’s own tissue, which eliminates the risk of rejection and usually promotes faster integration. The allograft comes from a donor, reduces surgical time and avoids discomfort in the donor area, although its incorporation may be slower.
¿Cuándo puedo volver a practicar deportes de contacto?
A return to contact sports is cleared when the rehabilitation phases are completed, strength is restored, and functional tests indicated by the sports medicine team are passed. This is usually allowed from the ninth month onwards.
If you suspect a knee injury or have already been diagnosed with anterior cruciate ligament damage, the team at COPAC — Center for Orthopedics and Traumatology in Panama — can guide you with an accurate diagnosis and a treatment plan appropriate to your situation. You can contact us via email recepcion@copac.com.pa, at +507 310 2866 or by WhatsApp at +507 6090-8815. We are located at The Panama Clinic, Tower B, 23rd Floor, Office 2315. You do not need a prior medical referral to schedule your consultation.
If you are looking for guidance on an anterior cruciate ligament injury, at COPAC you can receive an evaluation and a management plan according to your case.
