“Cubitus-valgus” deformity is complication of :
**Core Concept**
Cubitus valgus deformity is a condition characterized by a noticeable increase in the carrying angle of the elbow, resulting from malunion of the supracondylar fracture of the humerus. This deformity arises from the misalignment of the bone fragments during the healing process.
**Why the Correct Answer is Right**
The cubitus valgus deformity occurs due to the improper alignment of the fracture fragments, particularly the distal fragment, which is angulated in a valgus direction. This misalignment leads to an abnormal carrying angle, which can cause cosmetic concerns and functional limitations. The deformity is often associated with a fracture of the lateral condyle or the lateral column of the humerus.
**Why Each Wrong Option is Incorrect**
* **Option A:** Cubitus valgus deformity is not typically associated with fractures of the medial condyle or the medial column of the humerus, which would more likely result in a varus deformity.
* **Option B:** While malunited fractures can lead to various complications, cubitus valgus deformity is specifically related to the supracondylar fracture of the humerus, not other types of fractures.
* **Option C:** Cubitus valgus deformity is not typically a complication of osteochondritis dissecans, which is a condition affecting the cartilage and bone in the joint.
**Clinical Pearl / High-Yield Fact**
To remember the common causes of cubitus valgus deformity, use the mnemonic "LATERAL" - Lateral condyle fracture, Angular misalignment, Tardy ulnar nerve palsy, Ectopic ossification, Ruptured lateral ligaments, and Torsional deformity.
**Correct Answer:** C