means a deformity of a limb in which part of it is deviated towards the midline of the body) is a common deformity in which the extended forearm is deviated towards midline of the body .
Cubitus varus is often referred to as 'Gunstock deformity', due to the crooked nature of the healing.
The "opposite" condition is cubitus valgus.
A common cause is the supracondylar fracture of humerus. It can be corrected via a corrective osteotomy
of the humerus and either internal or external fixation of the bone until union.
Cubitus varus is not able to be diagnosed until after healing of the prior fracture, as the arm must be in full extension, not flexion, for the deformity to be noticed.
A cubitus varus deformity is more cosmetic than limiting of any function, however internal rotation
of the radius
over the ulna
may be limited due to the overgrowth of the humerus. This may be noticeable during an activity such as using a computer mouse
Instances in which the medial epicondyle
of the distal humerus is malformed due to the initial fracture at the humeral endplate may result in subluxation
(snapping) of the ulnar nerve
over the medial epicondyle with active flexion and extension of the elbow. In such instances, conductance of the ulnar nerve
may be compromised due to chronic irritation, potentially resulting in irreversible ulnar neuropathy