A patient met with Road Traffic Accident with injury to the left knee. Dial test was positive. What could be the cause ?
**Core Concept**
The dial test, also known as the dial sign or pivot shift test, is a clinical examination used to assess the integrity of the anterior cruciate ligament (ACL) in the knee joint. It is a dynamic test that involves a combination of flexion and rotation movements to evaluate the knee's stability.
**Why the Correct Answer is Right**
A positive dial test in a patient with a left knee injury following a road traffic accident suggests an ACL injury. The ACL is a critical ligament that provides stability to the knee joint, particularly during rotational movements. When the ACL is injured, the tibia (shin bone) can move excessively in relation to the femur (thigh bone), resulting in a positive dial test. This is because the tibia moves anteriorly (forward) relative to the femur when the patient's knee is flexed and internally rotated. The ACL injury can occur due to the sudden twisting or bending forces experienced during the road traffic accident.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
A positive dial test is a strong indicator of ACL injury, and it is essential to consider other diagnostic tests, such as the Lachman test or the anterior drawer test, to confirm the diagnosis. Additionally, a thorough physical examination and imaging studies may be necessary to evaluate for associated injuries, such as meniscal tears or osteochondral fractures.
**Correct Answer: C. ACL injury**