Finger Dislocation on X-ray: Imaging Findings
Finger dislocations happen when the joint surfaces lose normal contact. The PIP joint is especially vulnerable during ball sports and falls. X-rays before and after reduction help show the direction of dislocation, whether the joint is back in place, and whether a small avulsion fracture or volar plate injury is present. Persistent subluxation can signal an unstable injury that needs specialist review.
Common Symptoms
- Sudden finger deformity after a jam, twist, fall, or sports injury
- PIP, DIP, or MCP joint pain with visible loss of normal alignment
- Swelling, bruising, and inability to bend or straighten the joint normally
- Numbness, color change, or severe pain that needs urgent clinical assessment
What We Look For on Imaging
- Dorsal, volar, or lateral displacement of the phalanx relative to the joint
- Small avulsion fractures from the volar plate or collateral ligaments
- Residual subluxation or joint incongruity after attempted reduction
- Impaction injury, joint surface step-off, or trapped soft tissue signs
- Associated tendon injury when extension or flexion remains limited
Frequently Asked Questions
Why are post-reduction X-rays important after a finger dislocation?
A finger can look straighter after reduction while still being slightly subluxed or associated with an avulsion fracture. Post-reduction views confirm alignment and help identify fragments that may affect splinting, early motion, or surgical referral.
Can a dislocation injure tendons or ligaments even if the X-ray looks reduced?
Yes. The X-ray mainly shows bone and alignment. Collateral ligaments, the volar plate, central slip, and flexor tendons can be injured during the same event. MRI or ultrasound may be considered when motion, stability, or tendon function does not match the X-ray appearance.
Sources
- Kolovich GP, Heifner JJ. Proximal interphalangeal joint dislocations and fracture-dislocations. J Hand Surg Eur Vol. 2023;48(2_suppl):27S-34S.
- Prucz RB, Friedrich JB. Finger joint injuries. Clin Sports Med. 2015;34(1):99-116.
- Leggit JC, Meko CJ. Acute finger injuries: part II. Fractures, dislocations, and thumb injuries. Am Fam Physician. 2006;73(5):827-834.
- Expert Panel on Musculoskeletal Imaging; Torabi M, Lenchik L, et al. ACR Appropriateness Criteria Acute Hand and Wrist Trauma. J Am Coll Radiol. 2019;16(5S):S7-S17.
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