A footballer sustained a blow on the lateral side of knee. X-ray showed no bony injuries. On examination,the Drawer tests were negative and McMurrays test was positive. Most probably structure could be :
## **Core Concept**
The question involves a knee injury sustained by a footballer, specifically focusing on the mechanism of injury and clinical tests used to diagnose knee ligament and meniscal injuries. The key tests mentioned are the Drawer tests and McMurray's test, which are used to assess knee stability and meniscal integrity, respectively.
## **Why the Correct Answer is Right**
The Drawer tests (anterior and posterior) are primarily used to assess the integrity of the cruciate ligaments. A negative result suggests that the cruciate ligaments are likely intact. McMurray's test, on the other hand, is used to assess meniscal tears. A positive McMurray's test indicates a meniscal tear. Given that the Drawer tests were negative (suggesting no cruciate ligament injury) and McMurray's test was positive (indicating a meniscal tear), the most likely injured structure in this scenario is the meniscus.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, options might include various knee structures such as ligaments (ACL, PCL, MCL, LCL), menisci, or other soft tissue injuries.
- **Option B:** Without the specific content of Option B, we can infer that if it suggested a cruciate ligament injury (ACL or PCL), it would be incorrect because the Drawer tests were negative.
- **Option C:** Similarly, without the content, if it suggested another type of injury not supported by the positive McMurray's test and negative Drawer tests, it would be incorrect.
- **Option D:** This would be incorrect if it does not align with the evidence pointing towards a meniscal injury.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that a footballer sustaining a blow to the lateral side of the knee could experience a meniscal injury due to the valgus stress (inward force) that can cause the meniscus to be pinched or sheared between the femur and tibia. McMurray's test is particularly useful in diagnosing meniscal tears, as it can elicit a palpable or audible click and reproduce pain when the meniscus is damaged.
## **Correct Answer:** C. Meniscus.