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Thumb lengthening using a three-dimensional half-ring distraction frame.

S Jia1, H Zhu2, X Zhang1

  • 1The hand surgery department, Third Hospital of Hebei Medical University, 139 Ziqiang Rd, Qiaoxi District, Shijiazhuang, 050051 Hebei, China.

Hand Surgery & Rehabilitation
|May 11, 2020
PubMed
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This summary is machine-generated.

A three-dimensional half-ring distraction frame effectively lengthens thumbs after loss, achieving bone union and good hand function. This method offers stable fixation and comparable joint mobility to the uninjured hand.

Area of Science:

  • Orthopedic surgery
  • Hand surgery
  • Reconstructive surgery

Background:

  • Thumb loss presents significant functional deficits.
  • Phalangeal lengthening is crucial for restoring thumb length and function.
  • External fixation devices offer potential for bone lengthening and deformity correction.

Purpose of the Study:

  • To evaluate the efficacy of a three-dimensional half-ring distraction frame for thumb phalangeal lengthening.
  • To assess functional outcomes and joint mobility following treatment for thumb loss.

Main Methods:

  • A retrospective study of 23 patients (23 thumbs) treated with a half-ring distraction frame for thumb lengthening.
  • Measurements of metacarpophalangeal (MCP) joint active movements using a goniometer, compared to the contralateral hand.
Keywords:
Allongement du pouceAmputation du pouceAppareil de fixation externe semi-circulaireCadre de distraction tridimensionnel en demi-cercleDistraction lengtheningReconstruction du pouceSemicircular external fixator deviceThree-dimensional half-ring distraction frameThumb amputationThumb reconstruction

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  • Clinical outcomes assessed using the modified Mayo score.

    • Main Results:

    • All patients achieved bone union and good alignment with a mean distraction time of 44 days.
    • No statistically significant differences were observed in palmar abduction, radial abduction, or MCP joint extension-flexion arc compared to the uninjured side (p>0.05).
    • High functional outcomes reported, with 19 excellent, 3 good, and 1 fair result based on the modified Mayo Score (mean 138).

    Conclusions:

    • The three-dimensional half-ring distraction frame is a viable and effective option for thumb phalangeal lengthening.
    • This device provides stable, three-dimensional fixation, leading to successful bone union and restoration of good hand function.
    • The technique allows for comparable joint mobility and functional outcomes to the uninjured contralateral thumb.