Distortion trauma (twisting) of the knee

What happens if you have a knee sprain? Briefly about anatomy

The knee joint is stabilized by an interaction of bones, menisci, ligaments, capsule, muscles and tendons. The cruciate ligaments (anterior and posterior cruciate ligaments) are particularly important for anterior/posterior stability and the collateral ligaments (medial ligament/medial collateral ligament and lateral ligament/lateral collateral ligament) are particularly important for lateral stability. Menisci act as buffers and stabilizers between the femur and tibia bones. When twisting, shearing and rotational forces act, which put strain on the ligaments and capsule beyond their normal limits.

• Medial ligament (MCL): often affected in valgus and external rotation mechanisms
• Lateral ligament (LCL): twisting with varus stress
• Anterior cruciate ligament (ACL): typically associated with pivoting, abrupt braking/twisting
• Menisci: can be affected by twisting trauma (tears)
• Capsule/soft tissue: painfully overstretched, often with swelling

Causes, mechanisms and risk factors

Sprains typically occur during sports that involve changing direction, jumping or physical contact. But a trip, slip or a misstep on the stairs can also twist the knee unfavorably.

• Mechanisms: abrupt braking, change of direction, landing after a jump, collision
• Surface/footwear: wet, smooth floor, cleats that “stick”
• Muscular factors: inadequate warm-up, fatigue, neuromuscular deficits
• Previous injuries: reduced proprioception, unstable ligaments
• Individual factors: ligament laxity, leg axis deviations, excess weight

Typical symptoms

The symptoms vary depending on the extent of the overstretching to the point of tearing. Not every twist is a cruciate ligament tear - many distortions are strains that can heal well with conservative therapy.

• Acute pain in the knee, often emphasized medially or laterally
• Swelling/effusion (sometimes pronounced within hours)
• Restricted movement, limping
• Feeling of instability or “breaking away”
• Tenderness along the affected ligament
• Occasional “snap” or “crack” moment at the time of the accident

Severity levels (general): Grade I = strain/strain without instability; Grade II = partial tear with moderate instability/pain; Grade III = complete tear with significant instability - often accompanying injuries.

First Aid: UNLIKE/POLICE and what to avoid

Immediately after the injury, simple measures can be taken to limit swelling and pain and reduce subsequent damage.

• Avoid in the first 48-72 hours: H.A.R.M. = Heat, Alcohol, Running (intense running), Massage.
• Painkillers can help briefly; pay individual attention to compatibility.

Diagnostics in practice: safe, structured, targeted

The clinical examination is central to distinguish between strains, partial tears and combination injuries. Imaging serves to confirm and rule out accompanying injuries.

• History: accident, audible cracking, immediate swelling, buckling events.
• Inspection/palpation: swelling, hematomas, pressure pain distribution, temperature.
• Stability testing: Valgus/varus stress (MCL/LCL), Lachman/anterior drawer (ACL), posterior drawer (PCL), meniscus testing (e.g. McMurray/Thessaly).
• Function: range of motion, gait, neuromuscular control.
• Sonography: Assessment of effusion, soft tissue and superficial ligamentous structures.
• X-ray (if fracture is suspected; Ottawa Knee Rules): e.g. B. inability to bear weight, pressure pain on patella/fibular head, flexion <90°, age >55.
• MRI: in case of persistent instability, suspected ligament/meniscus tear, unclear findings or treatment decision.

We discuss the findings transparently and create an individual therapy plan with you. Not every sprain needs an MRI – the indication is carefully determined.

Conservative therapy: the standard for most sprains

The majority of knee sprains heal well with conservative measures. Protection, pain-adapted increase in load and qualified physiotherapy are crucial.

• Pain and swelling control: cooling, compression, if necessary short-term analgesics.
• Orthoses/taping: if MCL/LCL is involved, a joint-guided knee orthosis is temporary; functional taping for relief.
• Load control: initially partial weight bearing with walking aids; Quickly move on to everyday exercise as soon as the pain has subsided.
• Physiotherapy, phase-oriented:
• – Acute (Week 1-2): Reduce swelling, pain-free mobility (extension/flexion), isometric activation quadriceps/hamstrings, patellar mobilization.
• – Subacute (weeks 2-6): normalize range of motion, build strength (closed kinetic), balance/proprioception, axial stability (hip/trunk muscles).
• – Return to activity (from weeks 4-10, depending on severity): running and jumping school, change of direction, sport-specific drills – always criteria-based.
• Lymphatic drainage: for severe swelling.
• Everyday adjustments: stairs, workplace ergonomics, driving – individually tailored.

Regenerative procedures: In selected cases (e.g. partial tears of the inner ligament or capsular irritation), autologous blood therapy (PRP) can be discussed to improve pain and function. The data situation is heterogeneous; a benefit is not guaranteed. We only use such procedures after careful examination of the indications and information.

When should surgery be considered?

A pure distortion without structural tears usually does not require surgery. Surgical measures are particularly considered for severe ligament injuries or relevant accompanying injuries.

• Complete ligament tears with significant instability (e.g. ACL rupture) - depending on activity level and accompanying findings.
• Combined injuries (e.g. MCL + ACL, LCL/corner, meniscus tear with blockage).
• Osteochondral avulsions/cartilage-bone lesions.
• Persistent instability/pain despite adequate conservative therapy.

We provide open-ended advice, ensure further clarification if necessary and accompany the postoperative rehabilitation process. A surgical decision is based on the findings, goals and risks - not just on the imaging.

Healing process and rehabilitation: realistic time periods

Healing times depend on severity, associated injuries and training compliance. What is important is a criteria-based approach instead of rigid schedules.

• Mild distortion (grade I): everyday stress is often possible after 1-2 weeks, sporting stress is possible after 3-6 weeks.
• Moderate sprain/partial tear (grade II, e.g. MCL): orthosis 2–6 weeks, return to sport often after 6–10 weeks.
• Severe sprain (Grade III/combined): longer rehab (8-12+ weeks) dependent on structural healing and stability.

Return-to-sport criteria (examples): pain-free full range of motion, no increase in swelling after exercise, strength symmetry of the lower extremity (≥90% compared to the opposite side), safe landing technique and change of direction tests.

Prevention and relapse prevention

With targeted training, the risk of new sprains can be significantly reduced.

• Neuromuscular training (e.g. programs like FIFA 11+): balance, core stability, landing control.
• Strength building hips/thighs (gluteal muscles, hamstrings, quadriceps).
• Technical training: braking and turning movements, jumping and landing mechanics.
• Check suitable footwear and space conditions.
• For contact sports: temporary functional knee supports in the return phase.

Everyday life, work and sport: practical tips

• Stairs: Using railings, step-by-step technique in the early stages.
• Sleeping: knees slightly elevated/positioned; Follow orthosis instructions at night.
• Work: initially reduce standing activities; ergonomic breaks.
• Driving a car: only when you can safely operate the pedal without pain.
• Travel: regular exercise breaks while on the move, compression if there is a tendency to swelling.
• Return to sport: under physiotherapeutic guidance, criteria-based.

Special situations

• Children/Adolescents: Consider growth plates; Cracks may appear different, careful imaging.
• Older patients: differential diagnosis of degenerative meniscus/cartilage lesions; Be aware of the risk of falls.
• Hypermobility/soft tissue laxity: longer stabilization phase required.
• Obesity: higher mechanical loads; focused strength/weight strategies.

When should you see a doctor quickly?

• Pronounced swelling within hours, massive effusion
• Audible “crack” with immediate instability
• Feeling of blockage (knee can no longer be extended/bent)
• Numbness, circulatory problems, severe skin discoloration
• Severe pain despite rest and analgesics
• Inability to put weight on the leg

If there are any warning signs, please clarify promptly. In Hamburg you can reach us at Dorotheenstraße 48, 22301 Hamburg, or you can book easily online.

Common Mistakes and Myths

• “Complete rest is always better.” – Early functional, measured exercise is usually superior.
• “Heat helps immediately.” – In the acute phase, heat can increase swelling.
• “Once twisted, half as wild.” – Repeated sprains increase the risk of ligament and meniscus damage.
• “Stretch as early as possible.” – Aggressive stretching in the acute phase can increase irritation.
• “Without an MRI you don’t know anything.” – The clinical examination is groundbreaking; Imaging is used specifically.