Clinical Significance of the Radiolucent Zone Around the Pedicle Screws in the Lumbar Degenerative Disease / 대한척추외과학회지
Journal of Korean Society of Spine Surgery
;
: 202-209, 2009.
Artigo
em Coreano
| WPRIM
| ID: wpr-86528
ABSTRACT
STUDY DESIGN:
A retrospective study.OBJECTIVE:
To analyze the clinical significance of the radiolucent zones surrounding pedicle screws. SUMMARY OF LITERATURE REVIEW Clear zones have been suggested in pseudoarthrosis and a loss of fixation. However, few reports have clearly described the long-term course and clinical significance of clear zones. MATERIALS ANDMETHODS:
The clear zones were evaluated in 399 patients with pedicle screw fixation after 6 months, 1 year, 2 years and 3 years. The patient was considered to be clear zone positive when 1 mm or greater circumferential lucency was confirmed around a screw on film from 2 or more directions. The time-course of the clear zones was examined with regard to age, number of levels fused, bone union, fusion method and reoperation.RESULTS:
After 6 months, clear zones were observed in 124 patients (31.1%) but the clear zone-positive rate decreased with time. Clear zones were observed in 89 patients(22.3%), 44 patients(11.0%) and 41 patients(10.3%) after 1 year, 2 years and 3 years, respectively. No new clear zones had developed after 6 months. At the final follow-up, pseudoarthrosis was observed in 12 patients(3.0%). Among them, 11 were clear zone-positive and 1 was clear zone-negative. There was a statistically significant relationship between the clear zone-positive rate and multi-levels, older age and nonunion during following up. In addition, there was a relatively lower clear zone-positive rate in posterolateral fusion combined with posterior lumbar interbody fusion than only posterolateral fusion. However, the difference between them was not statistically significant.CONCLUSION:
The presence of clear zones does not always mean pseudoarthrosis but clear zones persisting for more than 2 years after surgery have a higher rate of pseudoarthrosis.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Pseudoartrose
/
Reoperação
/
Estudos Retrospectivos
/
Seguimentos
Tipo de estudo:
Estudo observacional
/
Estudo prognóstico
Limite:
Humanos
Idioma:
Coreano
Revista:
Journal of Korean Society of Spine Surgery
Ano de publicação:
2009
Tipo de documento:
Artigo
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