Final answer:
A loud popping sound and hyperextension of the knee on a basketball court likely indicate an ACL injury, confirmed by increased forward movement of the tibia during the anterior drawer test, which shows knee instability.
Step-by-step explanation:
If your friend hears a loud popping sound and hyperextends her knee on the basketball court, it is likely that she has sustained an injury to her anterior cruciate ligament (ACL). When the foot is planted and a sudden forceful motion occurs, such as a quick change in direction combined with hyperextension, it can lead to ACL injury. The anterior drawer test is a diagnostic physical examination where the lower leg is pulled forward while the knee is bent. If the test shows that the tibia slides forward more than normal, it suggests that there is likely a tear in the ACL, confirming knee instability.
A terrible triad injury is a particularly severe knee injury that can result from a powerful blow to the lateral side of the extended knee, causing serious damage to multiple structures including the tibial collateral ligament, medial meniscus, and ACL. Hyperextension injuries to the knee can be painful and lead to significant knee instability. Recognizing these injuries and promptly seeking medical evaluation and treatment is essential for recovery and to prevent further damage.