Cubitus varus

Cubitus varus (gunstock deformity) is a malalignment of the distal humerus that results in a change of carrying angle from the physiologic valgus alignment (5-15 degrees) of the arm and forearm to varus malalignment. Historically, it is a complication of supracondylar fractures with a frequency as high as 30%. Its appearance is the major concern, as it causes little functional impairment

This deformity results due to malalignment of a supracondylar fracture. Varus alignment can result from collapse of the medial column from comminution. It can also result from an extension and internal rotation of the distal fractured fragment. This deformity is usually static and does not remodel over time.

An ulnar nerve palsy may sometimes occur from compression of chronic malposition of the triceps.

Plain AP and lateral x-rays of the affected and unaffected elbow should be obtained for comparison and operative planning if surgical correction is desired.

MRI scans of the elbow may be of value if growth disturbances of the distal humerus are suspected.

Growth disturbances of the distal humerus medial condyle or trochlea.

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Article information

rID: 48673
Tag: refs, cases
Synonyms or Alternate Spellings:
  • Gunstock deformity

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Cases and figures

  • Figure 1: normal carrying angle
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  • Cubitus varus
    Case 1
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