Initial clinical experience with the IMEX™ circular external skeletal fixation system - Part II: Use in bone lengthening and correction of angular and rotational deformities

D. D. Lewis, R. M. Radasch, B. S. Beale, J. T. Stallings, R. D. Welch, M. L. Samchukov, O. I. Lanz

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The IMEX™ Circular External Skeletal Fixation (CESF) System was used to treat 10 antebrachial deformities in nine dogs. The mandible of one dog with prognathism was also lengthened. Dogs ranged in age from four to 18 months (mean ± SD: 9 ± four months; median: eight months) and body weight from 2.6 to 46.0 kg (mean ± SD: 23.9 ± 11.2 kg; median: 24.2 kg). Linear distractions were performed with linear motors or threaded rods with paired nylon nuts securing the connecting rods to rings placed between ring blocks. Hinges and angular motors were used to correct angular deformities. A latency period of two to six days and a distraction rate of 1 mm/day, with a twice daily rhythm, were used. Distraction periods ranged from 12 to 32 days (mean ± SD: 21 ± 8 days; median: 25 days). Lengthening achieved ranged from 11 to 40 mm (mean ± SD: 20 ± 9 mm; median: 18 mm) or 6 to 30% (mean ± SD: 15 ± 8%; median: 13%) of the distracted bone's initial length. All dogs had substantial improvement of their deformity and effective regenerate bone formation. Flexure contracture and wire and pin track inflammation were common complications during the convalescent period. Functional and cosmetic results (direct examination: mean ± SD: 130 ± 65 days; median: 123 days; telephone communication: mean ± SD: 351 ± 133 days; median: 324 days) were assessed as excellent in six, good in three and fair in two dogs and excellent in five, good in four and fair in one dog, respectively. The IMEX™ CESF system allowed precise deformity correction with minimal morbidity which was attributable to the system's zero tolerance, zero motion properties.

Original languageEnglish (US)
Pages (from-to)118-127
Number of pages10
JournalVeterinary and Comparative Orthopaedics and Traumatology
Volume12
Issue number3
StatePublished - 1999

Fingerprint

Bone Lengthening
Fracture Fixation
bones
Dogs
dogs
zero tolerance
Prognathism
contracture
mandible (bone)
Nuts
Nylons
pins
Contracture
cosmetics
nylon
bone formation
wire
Mandible
Telephone
Osteogenesis

Keywords

  • Distraction osteogenesis
  • Limb deformity

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

Cite this

@article{58e046aa889944418eae45f5420fa5fa,
title = "Initial clinical experience with the IMEX™ circular external skeletal fixation system - Part II: Use in bone lengthening and correction of angular and rotational deformities",
abstract = "The IMEX™ Circular External Skeletal Fixation (CESF) System was used to treat 10 antebrachial deformities in nine dogs. The mandible of one dog with prognathism was also lengthened. Dogs ranged in age from four to 18 months (mean ± SD: 9 ± four months; median: eight months) and body weight from 2.6 to 46.0 kg (mean ± SD: 23.9 ± 11.2 kg; median: 24.2 kg). Linear distractions were performed with linear motors or threaded rods with paired nylon nuts securing the connecting rods to rings placed between ring blocks. Hinges and angular motors were used to correct angular deformities. A latency period of two to six days and a distraction rate of 1 mm/day, with a twice daily rhythm, were used. Distraction periods ranged from 12 to 32 days (mean ± SD: 21 ± 8 days; median: 25 days). Lengthening achieved ranged from 11 to 40 mm (mean ± SD: 20 ± 9 mm; median: 18 mm) or 6 to 30{\%} (mean ± SD: 15 ± 8{\%}; median: 13{\%}) of the distracted bone's initial length. All dogs had substantial improvement of their deformity and effective regenerate bone formation. Flexure contracture and wire and pin track inflammation were common complications during the convalescent period. Functional and cosmetic results (direct examination: mean ± SD: 130 ± 65 days; median: 123 days; telephone communication: mean ± SD: 351 ± 133 days; median: 324 days) were assessed as excellent in six, good in three and fair in two dogs and excellent in five, good in four and fair in one dog, respectively. The IMEX™ CESF system allowed precise deformity correction with minimal morbidity which was attributable to the system's zero tolerance, zero motion properties.",
keywords = "Distraction osteogenesis, Limb deformity",
author = "Lewis, {D. D.} and Radasch, {R. M.} and Beale, {B. S.} and Stallings, {J. T.} and Welch, {R. D.} and Samchukov, {M. L.} and Lanz, {O. I.}",
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T1 - Initial clinical experience with the IMEX™ circular external skeletal fixation system - Part II

T2 - Use in bone lengthening and correction of angular and rotational deformities

AU - Lewis, D. D.

AU - Radasch, R. M.

AU - Beale, B. S.

AU - Stallings, J. T.

AU - Welch, R. D.

AU - Samchukov, M. L.

AU - Lanz, O. I.

PY - 1999

Y1 - 1999

N2 - The IMEX™ Circular External Skeletal Fixation (CESF) System was used to treat 10 antebrachial deformities in nine dogs. The mandible of one dog with prognathism was also lengthened. Dogs ranged in age from four to 18 months (mean ± SD: 9 ± four months; median: eight months) and body weight from 2.6 to 46.0 kg (mean ± SD: 23.9 ± 11.2 kg; median: 24.2 kg). Linear distractions were performed with linear motors or threaded rods with paired nylon nuts securing the connecting rods to rings placed between ring blocks. Hinges and angular motors were used to correct angular deformities. A latency period of two to six days and a distraction rate of 1 mm/day, with a twice daily rhythm, were used. Distraction periods ranged from 12 to 32 days (mean ± SD: 21 ± 8 days; median: 25 days). Lengthening achieved ranged from 11 to 40 mm (mean ± SD: 20 ± 9 mm; median: 18 mm) or 6 to 30% (mean ± SD: 15 ± 8%; median: 13%) of the distracted bone's initial length. All dogs had substantial improvement of their deformity and effective regenerate bone formation. Flexure contracture and wire and pin track inflammation were common complications during the convalescent period. Functional and cosmetic results (direct examination: mean ± SD: 130 ± 65 days; median: 123 days; telephone communication: mean ± SD: 351 ± 133 days; median: 324 days) were assessed as excellent in six, good in three and fair in two dogs and excellent in five, good in four and fair in one dog, respectively. The IMEX™ CESF system allowed precise deformity correction with minimal morbidity which was attributable to the system's zero tolerance, zero motion properties.

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