Question

MC complications of untreated radial head dislocation

• A. Cubitus varus
• B. Cubitus valgus
• C. Damage to ulnar nerve
• D. Myositis ossificans

Hint:

Cubitus valgus can lead to functional limitations in arm movement and requires timely management to prevent long-term deformities.

Answer 1

The Correct Option is B

To address the question of the most common complications of untreated radial head dislocation, let's discuss each option and determine why cubitus valgus is the correct answer and others are not.

1. Understanding Radial Head Dislocation:
   • Radial head dislocation refers to the abnormal displacement of the radial head from its normal articulation with the capitellum of the humerus.
   • It can occur due to trauma or developmental issues and, if left untreated, may lead to several complications.
2. Potential Complications:
   1. Cubitus Varus:
      • This condition involves a deformity where the forearm deviates towards the midline of the body when the arm is extended, commonly referred to as "gunstock deformity."
      • Cubitus varus is typically seen after malunion of supracondylar fractures of the humerus and not commonly associated with untreated radial head dislocation.
   2. Cubitus Valgus:
      • This condition entails an increased angle between the humerus and forearm, resulting in an abnormal outward deviation of the forearm.
      • Untreated radial head dislocation can lead to instability, causing adaptive changes that result in cubitus valgus deformity over time.
      • This aligns with the correct option provided.
   3. Damage to Ulnar Nerve:
      • While ulnar nerve issues are potential complications in elbow traumas, including late effects of malalignment, they are not the most common direct complication of radial head dislocation.
   4. Myositis Ossificans:
      • This condition involves abnormal bone formation in the muscle, commonly seen after traumatic injuries and sometimes in conjunction with aggressive rehabilitation.
      • It is not a direct complication of an untreated radial head dislocation.

Conclusion: Among the given options, cubitus valgus is the correct answer as it represents the most likely deformity to arise from untreated radial head dislocation due to the altered mechanics and forces at the elbow joint.