INTRA- AND INTEROBSERVER ANALYSIS OF PEDICLE SCREW PLACEMENT IN SCOLIOSIS CORRECTION

ANÁLISE INTRA E INTEROBSERVADOR DE POSICIONAMENTO DE PARAFUSOS PEDICULARES EM CORREÇÃO DE ESCOLIOSE

ANÁLISIS INTRA E INTEROBSERVADOR DE POSICIONAMIENTO DE TORNILLOS PEDICULARES EN CORRECCIÓN DE ESCOLIOSIS

ABSTRACT

Objective

To establish the statistical interobserver and intraobserver concordance of thoracic pedicle screw placement in scoliosis surgery, with a 4-week interval between the two analyses.

Methods

Of 55 patients that evaluated the intra- and interobserver concordances of the screw positions (according to the Abul-Kasim classification) using the Kappa coefficient.

Results

The intraobserver concordance ranged from a Kappa coefficient of 0.516 to 0.889 (“moderate” to “almost perfect”) between the two analyses performed four weeks apart. Interobserver concordance ranged from 0.379 to 0.633 (“reasonable” to “strong”).

Conclusion

The intraobserver concordance was always greater than the interobserver concordance. No concordance coefficient was classified as “insignificant” or “weak”. Level of Evidence III; Retrospective study.

Scoliosis; Pedicle Screws; Spine Deformity