Lateral condylar prominence, post corrective osteotomy of cubitus varus: a study using three-dimensional reverse...

Area of Science:

• Orthopedic surgery
• Biomechanical engineering
• Medical imaging

Background:

• Lateral condylar prominence is a frequent complication following corrective osteotomy for cubitus varus.
• This prominence is often attributed to unequal opposing cut surfaces in lateral-based wedge osteotomies with a medial hinge.

Purpose of the Study:

• To investigate the factors contributing to lateral condylar prominence after cubitus varus corrective osteotomy.
• To determine optimal surgical techniques for minimizing this complication using 3D modeling.

Main Methods:

• Utilized 3D CT data from a patient with cubitus varus deformity and their normal contralateral elbow.
• Employed reverse engineering software to create virtual 3D humerus models.
• Simulated medial hinge placements at various distances from the joint with 4-degree wedge osteotomies.

Main Results:

• Lateral condylar prominence is directly proportional to the distance of the medial hinge placement from the joint.
• The step-off phenomenon, not osteotomy surface length, significantly impacts condylar prominence.
• Optimal hinge placement near the joint with a 10-degree distal osteotomy cut minimizes prominence.

Conclusions:

• Medial hinge proximity to the joint is crucial for reducing lateral condylar prominence.
• A 10-degree distal osteotomy cut above the olecranon fossa, with the hinge placed close to the joint, offers optimal results.
• This technique effectively minimizes the step-off phenomenon, thereby reducing condylar prominence.