Premium Nahrungsergänzungsmittel | artgerecht

Varus Stress Test – Assessing Knee Stability

The varus stress test is a clinical examination used to assess the lateral stability of the knee or elbow joint. It evaluates the integrity of the lateral collateral ligament.

Regular tips about health Regular tips about health

Things worth knowing about "Varus Stress Test"

The varus stress test is a clinical examination used to assess the lateral stability of the knee or elbow joint. It evaluates the integrity of the lateral collateral ligament.

What is the Varus Stress Test?

The varus stress test is an orthopaedic and sports medicine examination technique in which a directed inward (varus) force is applied to a joint. It is most commonly performed on the knee joint to assess the integrity of the lateral collateral ligament (LCL). It may also be used at the elbow to evaluate the radial collateral ligament complex.

When is the Test Used?

The varus stress test is typically indicated in the following clinical situations:

Suspected lateral collateral ligament injury of the knee
Following knee trauma, particularly sports-related injuries
Differential diagnosis of lateral knee pain
Suspected posterolateral instability of the knee
Preoperative assessment prior to knee reconstruction surgery

How the Test is Performed

The test is usually conducted in two positions:

Full Extension (0 degrees)

The patient lies supine. The examiner stabilizes the thigh with one hand and applies a medially directed force to the lower leg with the other. Joint gapping (widening of the lateral joint space) in this position suggests a significant ligamentous injury.

At 30 Degrees of Flexion

The test is repeated with the knee slightly flexed (approximately 20–30 degrees). Instability only in flexion, but not in extension, suggests an isolated lateral collateral ligament tear. Instability in both positions indicates a more complex posterolateral involvement.

Interpretation of Results

Results are commonly graded as follows:

Grade I: Mild gapping (0–5 mm), firm endpoint retained – ligament sprain
Grade II: Moderate gapping (5–10 mm), soft endpoint – partial tear
Grade III: Significant gapping (over 10 mm), no endpoint – complete rupture

A positive varus stress test indicates damage to the lateral collateral ligament or the posterolateral structures of the knee.

Diagnostic Accuracy

The varus stress test is typically complemented by additional investigations. These include imaging such as magnetic resonance imaging (MRI), which allows detailed assessment of ligamentous and soft tissue structures, as well as stress radiographs to objectively quantify the degree of instability. Clinical examination alone has limited sensitivity and specificity and should always be interpreted in the context of patient history and other findings.

Treatment Following a Positive Result

Treatment depends on the severity of the ligament injury:

Grade I and II: Conservative management with rest, physiotherapy, muscle strengthening, and a brace if needed
Grade III or complex instability: Surgical reconstruction of the lateral ligament complex, particularly in physically active patients or when additional structures are involved

References

Strobel, M. J. & Stedtfeld, H. W. (2023). Diagnostik des Kniegelenks. Springer Medizin Verlag.
LaPrade, R. F. et al. (2015). AAOS Clinical Practice Guideline on Knee Ligament Injuries. Journal of the American Academy of Orthopaedic Surgeons.
Cleland, J. & Koppenhaver, S. (2021). Netter's Orthopaedic Clinical Examination. Elsevier.

Building Blocks for a Healthy Life

As an integrated manufacturer, we develop & produce evidence-based, patented, and non-patented formulations. We work exclusively with plant and natural extracts according to the strictest purity & quality standards.
The combination of science & modern technology with the laws of nature creates solutions consistently tailored to humans – for the highest good: health.