The medial and lateral collateral ligaments stabilise the knee against sideways movement. Injury can range from overstretching to a complete tear. Treatment depends on whether the knee remains stable and whether other ligaments or the meniscus are also affected.
Deformity, a cold or numb foot, or major instability after injury requires urgent assessment.
Causes and risk factors
Sideways force, falls and rapid changes of direction can injure these ligaments. The medial ligament is injured more often. Lateral ligament injuries may involve other structures at the back and outer side of the knee.
Typical symptoms
Pain usually occurs on the injured inner or outer side of the knee. Swelling, tenderness and uncertainty when bearing weight are possible. Marked giving way suggests significant instability.
Diagnosis
After discussing how the injury happened, we assess stability, movement, circulation and nerve function. X-rays can show bony avulsions. MRI is particularly useful for marked instability or suspected associated injuries.
Non-surgical treatment
Many isolated medial ligament injuries can heal without surgery. Depending on severity, a hinged brace may provide temporary protection. Physiotherapy supports movement and muscle control. Weight-bearing instructions are individual; prolonged complete immobilisation is not automatically necessary.
Surgical options
Surgery may be needed for bony avulsions, complex ligament injuries or persistent instability. The decision is based on the full injury pattern. Specialist care is organised for complex reconstructions.
Aftercare and rehabilitation
Initial priorities are reducing swelling and restoring safe movement. Strength, balance and sport-specific activity are then developed. Returning to sport requires sufficient stability and control; a pain-free walk alone is not enough.
Common questions
Does a torn medial ligament need surgery?
Many isolated injuries heal with conservative treatment. Associated injuries and instability may change the decision.
When can I play football again?
Only when stability, strength and changes of direction are sufficiently safe. Clearance is based on function and injury severity.
Arrange a consultation
We discuss which treatment is suitable for your findings and which procedures are available within our outpatient service during a personal consultation. Outpatient operations take place at an external surgical centre.
Choose location & appointment →Our services →Other conditions in this region
Explore the topic
Further reading
Selected external resources about this condition. Some linked publications are in German.
Medical background
Sources & further information
These professional and patient resources provide further information about this condition. The text on this page is independently written.
AAOS: Collateral ligament injuries