Lateral collateral ligament injury
In plain language
Stretching or tearing of the ligament on the outer side of the knee, sometimes accompanied by other knee injuries.
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3 things to know first
- This entry concerns the knee LCL. It stabilizes the outer side of the joint.
- Severity ranges from sprain to complete tear. The report should state the degree and location.
- Other structures may also be injured. A clinician checks the whole knee.
What it is
The lateral collateral ligament connects the thighbone to the fibula on the outer side of the knee. An injury may stretch some fibers, partially tear the ligament, or rupture it. It may occur with damage to other structures that stabilize the back and outer knee.
Why it appears on your report
MRI can show ligament fiber disruption, surrounding swelling, and accompanying injuries. Ultrasound may assess the superficial ligament in selected cases. The report may describe a sprain, partial tear, or complete tear.
How serious is it
A mild isolated sprain and a complete tear with knee instability need different management. Symptoms, physical examination, and associated injuries determine the treatment plan.
When to seek care urgently
Seek prompt assessment if the knee is markedly unstable, you cannot bear weight after injury, or the foot becomes numb, cold, or weak.
What usually happens next
- Review examination of knee stability and the MRI findings.
- Check for associated ligament or nerve injury.
- Agree on protection, rehabilitation, or specialist treatment.
Further reading
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