MCL Sprain

Lower Limb

Overview

MCL sprains represent injuries to the medial collateral ligament of the knee, typically resulting from valgus stress or rotational forces. This is one of the most common knee ligament injuries, ranging from mild stretching to complete ligament rupture. Most MCL sprains respond well to conservative management with appropriate rehabilitation.

Pathophysiology

The MCL is the primary restraint to valgus (inward bending) stress at the knee. Injury occurs when excessive valgus force is applied, often combined with external tibial rotation or deceleration movements. This causes micro-tearing or complete disruption of the ligamentous fibers, triggering an inflammatory cascade. The medial joint capsule and associated structures may also be damaged. Healing typically occurs over 4-12 weeks depending on severity, with scar tissue formation providing eventual stability.

Patient Education

Most MCL sprains heal well with conservative care focusing on early movement within pain limits, progressive strengthening of knee stabilizers, and gradual return to activity to prevent re-injury.

Typical Presentation

Site

Medial aspect of the knee, typically at the joint line or along the ligament origin/insertion; may involve the posteromedial capsule

Quality

Sharp or throbbing pain with initial injury; transitions to dull ache; sensation of instability or 'giving way' with valgus stress

Intensity

Mild (Grade I): 2-4/10; Moderate (Grade II): 5-7/10; Severe (Grade III): 7-10/10 at time of injury

Aggravating

Valgus stress to knee (inward bending); external tibial rotation; pivoting or cutting movements; walking on uneven surfaces; descending stairs

Relieving

Rest and elevation; ice application; anti-inflammatory medications; knee support or bracing; avoiding valgus-stress activities

Associated

Swelling and bruising over medial knee; loss of range of motion; difficulty with weight-bearing; positive valgus stress test; possible quadriceps inhibition; antalgic gait pattern

Orthopaedic Tests

Test descriptions are written with AI assistance from standard clinical texts. Where a test lists Sources, its description has been checked against them; those sources are independent and do not endorse OsteoKit. Accuracy figures and grades (A–D) appear only when checked against the published study; tests without one are marked “No accuracy study”.

Further reading: full test procedures are described in standard clinical examination texts, e.g. Magee & Manske, Orthopedic Physical Assessment (7th ed.), and Cook & Hegedus, Orthopedic Physical Examination Tests: An Evidence-Based Approach (2nd ed.).

Grade A
A+ABCDStrong clinical value: substantially changes the diagnosis (LR ≥10 or ≤0.1)
useful both to rule in and rule out.

Lachman Test

Procedure

Patient supine, knee bent to 20–30°. Stabilise the lower femur with one hand and pull the upper tibia forwards with the other, comparing movement and end-feel with the other knee.

Positive Finding

More forward movement than on the other side, with a soft or absent end-point.

Sensitivity / Specificity

85%/94%

Reference: Benjaminse A et al., J Orthop Sports Phys Ther 2006; PMID 16715828

Interpretation

Tests the anterior cruciate ligament. MCL injuries often occur with ACL tears, so check it in every valgus injury. Note: the Lachman test is a test for anterior cruciate ligament integrity; its figures derive from ACL-rupture populations (Benjaminse 2006) and it is relevant here only to screen for a concomitant ACL injury, not the collateral ligament itself.

Sources

Grade A
A+ABCDStrong clinical value: substantially changes the diagnosis (LR ≥10 or ≤0.1)
useful both to rule in and rule out.

Anterior Drawer Test

Procedure

Patient supine, hip bent to 45° and knee to 90°, foot flat. Sit gently on the foot, check the tibia is not sagging, then pull the upper tibia forwards and compare with the other knee.

Positive Finding

More forward movement of the tibia than on the other side.

Sensitivity / Specificity

92% (chronic)/91% (chronic)

Reference: Benjaminse A et al., J Orthop Sports Phys Ther 2006; PMID 16715828

Interpretation

Tests the anterior cruciate ligament. It is less reliable than the Lachman test in acute injuries because of pain and hamstring guarding. Note: the anterior drawer test is a test for anterior cruciate ligament integrity; its figures derive from ACL-rupture populations (Benjaminse 2006) and it is relevant here only to screen for a concomitant ACL injury, not the collateral ligament itself.

Sources

Grade B
A+ABCDGood clinical value: meaningfully changes the diagnosis in one direction (LR 5–10 or 0.1–0.2)
best for ruling IN (confirmation).

Thessaly Test

Procedure

Patient stands on the affected leg, holding your hands for balance, knee bent to 5°, and rotates the body and knee in and out three times; repeat at 20°. Only once the MCL is comfortable to stand on.

Positive Finding

Joint line pain, locking or catching during rotation.

Sensitivity / Specificity

75%/87%

Reference: Smith BE et al., Evid Based Med 2015; PMID 25724195

Interpretation

A meniscal test, used here to check for a coexisting meniscal injury. Avoid it in an acute, painful or unstable knee. Thessaly test at 20° for meniscal tears: pooled sensitivity 75%, specificity 87% (Smith 2015 meta-analysis). A meniscal test; relevant here only if a concomitant meniscal injury is suspected.

Sources

No accuracy study

Valgus Stress Test (Abduction Stress Test)

Procedure

Patient supine, relaxed. Support the leg with the knee bent to 20–30°, one hand on the outer knee and one at the ankle, and apply a gentle inward (valgus) force. Repeat with the knee fully straight. Compare with the other knee.

Positive Finding

Pain on the inner knee, or more gapping of the inner joint line than on the other side.

Interpretation

Pain without extra gapping fits a grade 1 sprain; gapping with a firm end-point a grade 2; marked gapping without an end-point a grade 3. Gapping with the knee fully straight suggests a combined injury (cruciate ligament or posterior capsule) and needs urgent orthopaedic referral. The valgus stress test is the primary clinical test for MCL integrity, but high-quality diagnostic-accuracy data (sensitivity/specificity) are lacking; the previously cited source did not support the figures shown.

Sources

No accuracy study

Palpation of the MCL

Procedure

Patient supine, knee slightly bent. Palpate along the MCL from its origin near the adductor tubercle on the femur, across the joint line, to its insertion on the upper tibia.

Positive Finding

Focal tenderness at one point along the ligament.

Interpretation

Locates the injury (femoral, mid-substance or tibial end), which can affect healing time. Tenderness exactly at the joint line may also come from the medial meniscus.

Sources

No accuracy study

Dial Test

Procedure

Patient prone. Bend both knees to 30°, hold the feet and rotate both tibias outwards equally, and compare the angle between the foot and thigh on each side. Repeat at 90°.

Positive Finding

More external rotation on one side than the other.

Interpretation

Assesses the posterolateral corner (and, at 90°, the posterior cruciate ligament), not the MCL. Increased external rotation can also occur with a severe combined MCL injury. This entry previously described internal rotation, which is incorrect. The dial test evaluates posterolateral corner rotational laxity, not the MCL; it does not belong to the MCL examination and no supporting figure was found.

Sources

⚠ Red Flags

  • •Severe traumatic injury with complete ligamentous rupture requiring surgical consultation
  • •Signs of meniscal injury (locking, catching, McMurray's test positive)
  • •Evidence of anterior cruciate ligament injury (positive Lachman or anterior drawer test)
  • •Knee effusion with severe swelling and warmth suggesting hemarthrosis or inflammatory arthritis
  • •Recurrent episodes of instability or 'giving way' indicating chronic ligamentous insufficiency
  • •Signs of compartment syndrome (severe pain, tense swelling, pain on passive stretch)
  • •Neurovascular compromise (numbness, coldness, pallor, absent pulses)

⚡ Yellow Flags

  • •Fear-avoidance behaviors limiting appropriate rehabilitation participation
  • •Catastrophic thinking about the injury ('this will never heal,' 'I'll never play sports again')
  • •Poor compliance with rehabilitation program or home exercise prescription
  • •Secondary gain from injury (attention, time off work/sport without genuine need)
  • •High kinesiophobia (fear of movement) limiting progressive functional restoration
  • •History of multiple joint injuries suggesting possible proprioceptive deficits or movement pattern dysfunction
  • •Psychological distress related to time away from sport or activity that defines patient identity

Osteopathic Techniques

Most MCL injuries (grade I–II) are treated without surgery: NSAIDs, a short spell in a knee immobiliser with crutches, then physiotherapy with quadriceps strengthening, cycling and a graded return to sport.

Region

Medial knee: MCL and joint capsule

Technique

Soft tissue, knee and quadricepsNo trials found

Rationale

Hands-on work to the quadriceps and the tissues around the knee to ease tension and pain.

How it's done & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the quadriceps, the patellar and quadriceps tendons, the iliotibial band near the knee and the tissues around the joint. Transverse friction massage across a tendon is one form. In trials it was given alongside exercise.

Evidence in MCL Sprain

Searched 24 Oct 2026: no trials of soft tissue technique in MCL sprains.

Region

Tibiofemoral and patellofemoral joints

Technique

Articulation, knee (tibiofemoral and patellofemoral)No trials found

Rationale

Gentle, rhythmic glides of the knee and kneecap within their range to ease pain and stiffness.

How it's done, cautions & evidence

How it's done

Passive, low-velocity glides of the knee within its range, with no thrust: distraction and front-to-back glides of the tibia on the femur, and glides of the kneecap in each direction, usually 2–3 oscillations a second for 1–2 minutes. A Mulligan variant holds a sustained glide of the tibia while the patient actively bends and straightens the knee.

Cautions

In knee osteoarthritis trials, no serious adverse events were reported with manual therapy.

Evidence in MCL Sprain

Searched 24 Oct 2026: no trials of knee mobilisation in MCL sprains.

Region

Hamstrings and adductors

Technique

Muscle energy, hip and thigh musclesNo trials found

Rationale

Low-force, patient-powered stretch for tight hip and thigh muscles.

How it's done, cautions & evidence

How it's done

The muscle (for example the hamstrings, adductors or rectus femoris) is taken to its barrier. The patient pushes gently, at about 10–20% effort, against resistance for 5–10 seconds, relaxes for 3–5 seconds, and the new barrier is taken up.

Cautions

Not used with an acute fracture, a joint infection or a bone malignancy; take care with severe osteoporosis or after surgery that limits muscle contraction. Use the least force needed: too much can tear a muscle or pull off a tendon, especially in older patients.

Evidence in MCL Sprain

Searched 24 Oct 2026: no trials of hamstring or adductor muscle energy technique in MCL sprains.

Rehabilitation Exercises

Supine Knee Flexion-Extension with Towel Roll

Range of MotionBeginner

Seated Knee Flexion with Overpressure

Range of MotionBeginner

Quadriceps Setting (Isometric Quad Contractions)

StrengtheningBeginner

Straight Leg Raises with Hip Abduction Bias

StrengtheningBeginner

Seated Hip Abduction with Resistance Band

StrengtheningIntermediate

Clamshells (Side-Lying Hip External Rotation)

StrengtheningIntermediate

Supine Hamstring Stretch with Strap

StretchingBeginner

Seated Adductor Stretch (Butterfly Position)

StretchingBeginner

Single Leg Standing on Firm Surface

BalanceIntermediate

Double Leg Balance on Foam Pad or Balance Disc

BalanceIntermediate

Single Leg Balance on Unstable Surface (Foam Pad)

BalanceAdvanced

Step-Ups with Controlled Knee Alignment

PosturalAdvanced

Referral Criteria

  • •Complete MCL rupture (Grade III) with marked instability requiring orthopedic surgical consultation
  • •Concomitant ACL, PCL, or meniscal injury evident on clinical examination or imaging
  • •Failure to improve with conservative management after 8-12 weeks of appropriate therapy
  • •Recurrent episodes of acute instability ('giving way') despite rehabilitation, suggesting chronic insufficiency
  • •Evidence of knee osteoarthritis or underlying inflammatory arthropathy requiring rheumatological assessment
  • •Suspected osteochondral injury or loose body causing mechanical symptoms
  • •Neurovascular compromise requiring vascular surgery consultation
  • •Severe swelling and pain suggestive of hemarthrosis requiring aspiration
  • •Functional limitations preventing return to required activities despite therapeutic intervention after 12+ weeks