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.
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.
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