Varus Test of the knee

 Varus Test of the knee

What is Varus Test of the knee?

Varus Test of the knee is used to evaluate the integrity of the lateral collateral ligament injury.

How it’s Performed?

What does a positive Varus Test of the knee mean?

The Varus Test of the knee is positive if pain or excessive motion is elected on the lateral side of the knee joint compared with the other extremity.

The following structures may be implicated:

  1. Lateral collateral ligament LCL
  2. Lateral capsular ligament
  3. Arcuate-popliteus complex
  4. Anterior cruciate ligament ACL
  5. Posterior cruciate ligament PCL.

When testing lateral stability, the examiner assesses the degree of joint opening and the quality of the end point.

Valgus and Varus test of the knee can be graded by the following1:

  1. Grade I: The joint space opening is within 2 mm of the contralateral side.
  2. Grade II: The joint space opens 3–5 mm more than the contralateral side in 20 degrees of knee flexion and less than 2 mm more than the normal knee in full extension.
  3. Grade III: The joint space opens 5–10 mm more than that of the normal knee in 20 degrees of flexion and full extension.

If the instability is gross, one or both cruciate ligaments as well as, occasionally, the biceps femoris tendon and the ilio tibial band may be involved, leading to a rotary instability if not in the short term, certainly over a period of time.

Notes

Related Anatomy

Lateral Collateral Ligament

The LCL, or fibular collateral ligament, arises from the lateral femoral condyle and runs distally and posteriorly to insert into the head of the fibula.

The LCL forms part of the so-called arcuate-ligamentous complex. This complex also comprises the biceps femoris tendon, iliotibial tract, and the popliteus.

The cord-like LCL develops independently, and remains completely free from the joint capsule and the lateral meniscus. It is separated from these structures by the popliteus tendon, and straddled by the split tendon of the biceps femoris.

The LCL can be divided into three parts:

  1. Anterior: This part consists of the joint capsule.
  2. Middle: This part is considered to be part of the iliotibial band (ITB) and covers the capsular ligament.
  3. Posterior: This Y-shaped portion of the ligament is part of the arcuate-ligamentous complex, which supports the posterior capsule.

The main function of the LCL is to resist varus forces. It offers the majority of the varus restraint at 25 degrees of knee flexion, and in full extension.

lateral collateral ligament knee
Lateral collateral ligament of the knee

Reference

  1. Reinold MM, Berkson EM, Asnis P, et al: Knee: Ligamentous and patella tendon injuries. In: Magee DJ, Zachazewski JE, Quillen WS, eds. Pathology and intervention in musculoskeletal rehabilitation. St. Louis, MI: Saunders, 2009:528–578.
  2. Youtube: Varus Stress Test of the Knee⎟Lateral Collateral Ligament – YouTube
  3. Clinical Tests for the Musculoskeletal System, Third Edition book.
  4. Mark Dutton, Pt . Dutton’s Orthopaedic Examination, Evaluation, And Intervention, 3rd Edition Book.

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