The most frequent direction in which the articular disc gets displaced is
**Core Concept**
The articular disc, also known as the meniscus, is a fibrocartilaginous structure located between the tibial and femoral condyles in the knee joint. Its primary function is to absorb shock, distribute pressure, and facilitate smooth movement of the joint. Displacement of the articular disc can lead to meniscal injuries, which are common in sports-related injuries.
**Why the Correct Answer is Right**
The most frequent direction in which the articular disc gets displaced is due to the biomechanics of the knee joint. When the knee is flexed and the foot is fixed, the tibia and femur move in a way that puts pressure on the meniscus. This pressure can cause the meniscus to tear or displace, often in the posterior direction. The posterior horn of the meniscus is more commonly affected due to its anatomical location and the direction of the forces acting on the knee joint.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the direction of meniscal displacement is not typically anterior.
**Option B:** This option is incorrect because the direction of meniscal displacement is not typically superior or inferior.
**Option C:** This option is incorrect because the direction of meniscal displacement is not typically posterior-medial or posterior-lateral, although these directions can occur.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that meniscal injuries often occur in conjunction with other knee injuries, such as ligament sprains or fractures. A thorough examination and imaging studies are necessary to diagnose and manage meniscal injuries effectively.
**Correct Answer: C. Posterior.**