Quick Summary
Outer-knee pain or instability after an injury needs a clear diagnosis. Rehabilitation is planned around the ligament damage and any associated injuries. Our physiotherapists in New Malden can assess your symptoms and help you choose appropriate next steps for your goals. We agree practical goals and review your progress.
Understanding LCL Injury
The lateral collateral ligament, or LCL, helps support the outside of the knee. A sprain ranges from overstretching to a complete tear. LCL injuries can occur with damage to other stabilising structures, including the posterolateral corner, so significant outer-knee instability deserves careful assessment.
Assessment at J&J Therapy
We review any emergency assessment, imaging and brace advice before rehabilitation. We assess safe movement and walking, and look for signs of associated ligament or nerve injury. Major instability is referred rather than treated as an isolated muscle problem.
Do You Experience These Symptoms?
- Tenderness or swelling on the outside of the knee after an injury.
- Pain with side-to-side movement or turning.
- A feeling of giving way or difficulty bearing weight confidently.
An assessment helps guide your next step, based on your symptoms, health and goals.
Treatment and rehabilitation options
Hands-On Manual Therapy
Once the injury is appropriately assessed, gentle hands-on care may help surrounding muscle discomfort or stiffness. Techniques must protect the healing ligament and any brace restrictions. Forceful sideways stretching is not part of early care. We explain the purpose and check your comfort and response throughout treatment.
Is Shockwave Suitable?
Shockwave is not a routine treatment for an acute LCL sprain or tear. It cannot restore knee stability in place of protection, rehabilitation or surgery when indicated. Your physiotherapist can explain the more suitable options and how their effect will be reviewed during your ongoing rehabilitation.
Targeted Exercise Programme
The plan progresses from safe range of movement and thigh activation to strength, balance and controlled changes of direction. Progression follows injury severity and specialist guidance. Sport readiness is assessed with functional tasks, not time alone. Your home plan is adapted as your function and confidence improve.
When to Seek Urgent Medical Help
While most symptoms are not serious, urgent medical attention is required if you experience any of the following:
- Seek urgent GP or NHS 111 advice if you cannot move the knee, bear weight, or straighten a knee that is locked.
- A hot swollen knee with fever or feeling unwell needs urgent medical assessment.
- Go to A&E for a deformed leg after injury or a foot that becomes cold, pale or numb.
Your questions answered
Will an LCL injury need surgery?
Some injuries can be managed without surgery, while complete or combined injuries may need an orthopaedic opinion. The whole injury pattern matters.
Should I wear a brace?
A brace may be prescribed to protect a significant injury. Follow the assessing clinician’s instructions; a generic support is not a substitute for checking instability.
Which appointment should I book?
Start with a Physiotherapy Initial Assessment for new, persistent or recurring symptoms. We can assess the problem and agree a plan linked to your daily activities. If you have already had medical care or surgery, bring the relevant instructions.
Book a Physiotherapy Assessment or call our reception team on 07935 869938. Find J&J Therapy at CI Tower, Ground Floor, New Malden.
Related conditions
Knee Ligament Sprain · MCL Injury
Sources and further reading
This page is for general information only and does not replace professional medical advice.
Information updated 15 October 2026. General information only; this page cannot diagnose your symptoms. Treatment is agreed after assessment. For urgent or severe symptoms, use the medical services described above.