Sports Medicine
Sports Injury Prevention & Rehabilitation

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LCL Tear

(Also known as a LCL Tear, LCL Injury, Torn LCL, Lateral Collateral Ligament Tear, LCL Sprain, Sprained LCL, Ruptured LCL)

What is a LCL tear?
A LCL tear is a relatively common sporting injury affecting the knee and is characterized by tearing of the Lateral Collateral Ligament of the knee (LCL).
A ligament is a strong band of connective tissue which attaches bone to bone. The LCL is situated at the outer aspect of the knee joint and is responsible for joining the outer aspect of the femur (thigh bone) to the outer aspect of the fibula (outer lower leg bone).
The LCL is one of the most important ligaments of the knee, giving it stability. The LCL achieves this role by preventing excessive twisting, and side to side movements of the knee (varus forces). When these movements are excessive and beyond what the ligament can withstand, tearing to the LCL occurs. This condition is known as a LCL tear.
A LCL tear may range from a small partial tear resulting in minimal pain, to a complete rupture of the LCL resulting in significant pain and disability. A LCL tear can be graded as follows:
  • Grade 1 tear: a small number of fibers are torn resulting in some pain but allowing full function
  • Grade 2 tear: a significant number of fibers are torn with moderate loss of function.
  • Grade 3 tear: all fibers are ruptured resulting in knee instability and significant loss of function. Other structures may also be injured such as the menisci or cruciate ligaments.

Causes of a LCL tear
LCL tears typically occur during activities placing excessive strain on the LCL. This generally occurs suddenly due to a specific incident, however, occasionally may occur due to repetitive strain. There are two main movements that place stress on the LCL, these include:
  • twisting of the knee
  • varus forces on the knee
When these movements (or combination of these movements) are excessive and beyond what the LCL can withstand tearing of the ligament may occur.
LCL tears are frequently seen in contact sports or sports requiring rapid changes in direction. These may include: football, soccer, basketball and downhill skiing. The usual mechanism of injury is a twisting movement when weight-bearing (especially when landing from a jump) or due to a collision to the inner knee, forcing the knee to bend in the wrong direction (such as another player falling across the inside of the knee). Occasionally a LCL tear may occur gradually due to repetitive activities placing strain on the ligament.

Signs and Symptoms of a LCL tear
Patients with this condition may notice an audible snap or tearing sound at the time of injury. In minor cases, patients may be able to continue activity only to experience an increase in pain, swelling and stiffness in the knee after activity with rest (particularly first thing in the morning). Often the pain associated with a torn LCL is localized to the outer aspect of the knee.
In cases of a complete rupture of the LCL, pain is usually severe at the time of injury, however, may sometimes quickly subside. Patients may also experience a feeling of the knee going out and then going back in as well as a rapid onset of swelling (within the first few hours following injury). Patients with a complete rupture of the LCL generally can not continue activity due to pain or the knee feeling unstable. Occasionally, the patient may be unable to weight bear at the time of injury due to pain and may develop bruising and knee stiffness over the coming days.

Diagnosis of a LCL tear

A thorough subjective and objective examination from a physician is usually sufficient to diagnose a LCL tear. Investigations such as an X-ray, MRI scan or CT scan may be required to confirm diagnosis and determine the extent of damage or involvement of other structures within the knee.

Treatment for a LCL tear
Most patients with this condition heal well with appropriate physical therapy. The success rate of treatment is largely dictated by patient compliance. A vital aspect of treatment is that the patient rests sufficiently from any activity that increases their pain (a LCL brace or crutches are often required). Activities placing large amounts of stress on the LCL should also be minimized, particularly twisting and varus forces to the knee. Resting from aggravating activities ensures the body can begin the healing process in the absence of further tissue damage. Once the patient can perform these activities pain free a gradual return to these activities is indicated provided there is no increase in symptoms.
  • Ignoring symptoms or adopting a 'no pain, no gain' attitude is likely to lead to the condition becoming chronic. Immediate, appropriate treatment in patients with a torn LCL is essential to ensure a speedy recovery. Once the condition is chronic, healing slows significantly resulting in markedly increased recovery times, an increased likelihood of future recurrence and chronic knee instability.
  • Patients with this condition should follow RICE in the initial phase of injury. RICE is beneficial in the first 72 hours following a LCL tear or when inflammatory signs are present (i.e. morning pain or pain with rest). RICE involves resting from aggravating activities (this may include a brace or the use of crutches), regular icing, the use of a compression bandage and keeping the leg elevated. Anti-inflammatory medication may also significantly hasten the healing process by reducing the pain and swelling associated with inflammation.
  • Patients with a LCL tear should perform pain-free flexibility and strengthening exercises as part of their rehabilitation to ensure an optimal outcome. One of the key components of rehabilitation is pain-free strengthening of the quadriceps, hamstring, gluteal and calf muscles to improve the control of the knee joint with weight-bearing activities. The treating physical therapist can advise which exercises are most appropriate for the patient and when they should be commenced.

Prognosis of a LCL tear
With appropriate management, most patients with a minor to moderate LCL tear (grades 1 and 2) can return to sport or normal activity within 2 – 8 weeks. Patients with a complete rupture of the LCL will require a longer period of rehabilitation to gain optimum function. Patients who also have damage to other structures of the knee such as the meniscus or cruciate ligaments are likely to have an extended rehabilitation period.

Physical therapy for a LCL tear

Physical therapy for patients with this condition is vital to hasten the healing process, ensure an optimal outcome and reduce the likelihood of future recurrence. Treatment may comprise:
  • soft tissue massage
  • joint mobilization
  • taping
  • bracing
  • ice or heat treatment
  • electrotherapy (e.g. ultrasound)
  • anti-inflammatory advice
  • exercises to improve flexibility, strength and balance
  • hydrotherapy
  • education
  • activity modification advice
  • crutches prescription
  • biomechanical correction
  • a gradual return to activity program

Other intervention for a LCL tear
Despite appropriate physical therapy management, a small percentage of patients with this condition do not improve adequately. When this occurs the treating physical therapist or doctor can advise on the best course of management. This may involve further investigation such as an X-ray, CT scan or MRI, or a review by a specialist who can advise on any procedures that may be appropriate to improve the condition. Surgical reconstruction of the LCL may be required in rare cases of a complete LCL rupture when conservative measures fail.