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Varus stress test at 0° and 30° - Varus stress testing is accomplished while the patient is lying supine on an examination table. The physician supports the thigh against the side of the exam table and applies a varus force to the knee joint while holding the ankle or foot , first at 0°of flexion and then at 30°.
A varus force applied to the flexed knee when the foot is planted and the femur rotated externally result in a tear of the lateral meniscus. [ 10 ] Tears produce rough surfaces inside the knee, which cause catching, locking, buckling, pain, or a combination of these symptoms.
An example of this would be a direct blow to the inside of the knee. The LCL can also be injured by a noncontact injury, such as a hyperextension stress, again causing varus force across the knee. [4] An LCL injury usually occurs simultaneously as the other ligaments of the knee are injured.
Most commonly, varus and valgus stress to the knee is added. These variations constitute different tests with different statistical performance and should not be confused with the original. According to some sources, the sensitivity of the McMurray test for medial meniscus tears is 53% and the specificity is 59%.
A tibial plateau fracture is a break of the upper part of the tibia (shinbone) that involves the knee joint. [1] This could involve the medial, lateral, central, or bicondylar (medial and lateral). [3] Symptoms include pain, swelling, and a decreased ability to move the knee. [1] People are generally unable to walk. [2]
A knee dislocation is an injury in which there is disruption of the knee joint between the tibia and the femur. [3] [4] Symptoms include pain and instability of the knee. [2] Complications may include injury to an artery, most commonly the popliteal artery behind the knee, or compartment syndrome. [3] [4] [7]
Hip-knee-ankle angle. On projectional radiography, the degree of varus or valgus deformity can be quantified by the hip-knee-ankle angle, [7] which is an angle between the femoral mechanical axis and the center of the ankle joint. [8] It is normally between 1.0° and 1.5° of varus in adults. [9] Normal ranges are different in children. [10]
The most common knee problems are: soft tissue inflammation, injury, or osteoarthritis. The mechanism of the knee injury can give a clue of the possible structures that can be injured. For example, applying valgus stress on the knee can cause medial collateral ligament rupture, meanwhile a varus force can cause lateral collateral ligament rupture