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Clinodactyly is a curvature or angulation of a digit, typically in the radio-ulnar plane, most commonly involving the fifth finger (little finger) curved toward the adjacent ring finger.
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Congenital malformation of the middle phalanx, often due to:
Associated syndromes:
| Syndrome | Notes |
|---|---|
| ‣ | Most common syndromic cause—clinodactyly of the 5th digit with brachydactyly |
| ‣ | May show similar digital curvature |
| ‣ | Reported, though less frequently |
| Silver–Russell syndrome | Characteristic 5th finger clinodactyly |
| Cornelia de Lange syndrome | Often seen along with other limb anomalies |
| ‣ | Skeletal anomalies including clinodactyly are frequent |
| Condition | Distinguishing Feature |
|---|---|
| Camptodactyly | Flexion contracture at PIP joint, not radial/ulnar deviation |
| Brachydactyly | Shortened finger rather than deviated |
| Kirner deformity | Palmar and radial curvature of distal 5th phalanx |
| Modality | Findings |
|---|---|
| X-ray (Hand) | Angulated (most often radial) curvature of the middle phalanx, commonly due to delta phalanx with C-shaped or triangular bone |
| CT / MRI | Rarely needed but may help in complex congenital hand anomalies |