Clinical course and significance of the clear zone around the pedicle screws in the lumbar degenerative disease

Spine
Yasuaki TokuhashiHiroshi Uei

Abstract

A retrospective study. To report the clinical course and significance of postoperative radiolucent zones around pedicle screws. Radiolucent zones around pedicle screws have been considered to indicate loss of fixation, delayed union, or pseudarthrosis. Few reports have described the course and significance of them. Plain radiographs were evaluated from 190 patients with pedicle screw fixation. When 1 mm or greater circumferential lucency was confirmed around a screw on plain radiographs from 2 or more directions, the patient was judged as clear-zone positive. The course of clear-zone positivity was investigated and the relationships between clear-zone positivity and the following items were investigated: (1) number of levels fused, (2) bone union, (3) posterolateral lumbar fusion versus posterior lumbar interbody fusion, (4) clinical results, (5) bone mineral density, and (6) screw types. Although clear zones were observed in 78 patients 6 months after surgery, the clear zone-positive rate decreased over time and the progression of bone union and the number of patients decreased to 28 at the final follow-up 3 years or more after surgery. Interobserver and intraobserver coefficient of variability in clear-zone judgment was over ...Continue Reading

Citations

Jun 18, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Fras Dakhil-JerewJ A N Shepperd
Mar 23, 2010·Clinical Nuclear Medicine·Morten DamgaardJan L Madsen
Oct 31, 2013·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Emin AghayevLorin M Benneker
Jun 20, 2014·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Zenya ItoNaoki Ishiguro
Aug 8, 2014·Spine·Daniel A BaluchAvinash G Patwardhan
Dec 15, 2010·Injury·Christina Goldstein, Brian Drew
Dec 6, 2014·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Christoph J SiepeH Michael Mayer
Apr 10, 2017·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Lukas WeiserWolfgang Lehmann
Jun 29, 2016·Clinical Spine Surgery : a Spine Publication·Sung Joon ShinJae Hyup Lee
Dec 20, 2017·Spine Surgery and Related Research·Naotaka IwamotoMasanori Isobe
Jun 25, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Satoru TaniokaMasaki Mizuno
Mar 27, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Da ZouWeishi Li
Jul 22, 2016·SpringerPlus·Tetsutaro MizunoTadashi Inaba
May 17, 2021·The Spine Journal : Official Journal of the North American Spine Society·Hee Jung SonChang-Nam Kang
Aug 10, 2021·Computer Methods in Biomechanics and Biomedical Engineering·Sebastiano CapraraMarco Senteler

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