Errors in measurement of acetabular index

N. M A Portinaro, D. W. Murray, T. P S Bhullar, M. K D Benson

Research output: Contribution to journalArticle

Abstract

Errors in determining the acetabular index can be induced either by incorrectly positioning the child for radiographs or by inter- or intraobserver errors. From postmortem radiographic studies, we have determined the magnitude of these errors. The error caused by pelvic rotation is ±3° if the obturator foramina ratio is kept within 0.5 to 2. If pelvic flexion/extension is confined to ±10°, the error induced by flexion/extension is ±3°. The intraobserver error was ±2°, and the interobserver error was ±3°. Under these circumstances, the total error is ±5°. We have not been able to find a satisfactory way of limiting the flexion/extension to ±10°. In some circumstances, particularly if a child is distressed, the flexion/ extension may be 20° from neutral; under these circumstances, errors as large as 10° can occur. Surgeons should be aware that very large errors can occur when the acetabular index is measured.

Original languageEnglish
Pages (from-to)780-784
Number of pages5
JournalJournal of Pediatric Orthopaedics
Volume15
Issue number6
Publication statusPublished - 1995

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Keywords

  • Acetabular index
  • Errors

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Pediatrics, Perinatology, and Child Health
  • Surgery

Cite this

Portinaro, N. M. A., Murray, D. W., Bhullar, T. P. S., & Benson, M. K. D. (1995). Errors in measurement of acetabular index. Journal of Pediatric Orthopaedics, 15(6), 780-784.

Errors in measurement of acetabular index. / Portinaro, N. M A; Murray, D. W.; Bhullar, T. P S; Benson, M. K D.

In: Journal of Pediatric Orthopaedics, Vol. 15, No. 6, 1995, p. 780-784.

Research output: Contribution to journalArticle

Portinaro, NMA, Murray, DW, Bhullar, TPS & Benson, MKD 1995, 'Errors in measurement of acetabular index', Journal of Pediatric Orthopaedics, vol. 15, no. 6, pp. 780-784.
Portinaro NMA, Murray DW, Bhullar TPS, Benson MKD. Errors in measurement of acetabular index. Journal of Pediatric Orthopaedics. 1995;15(6):780-784.
Portinaro, N. M A ; Murray, D. W. ; Bhullar, T. P S ; Benson, M. K D. / Errors in measurement of acetabular index. In: Journal of Pediatric Orthopaedics. 1995 ; Vol. 15, No. 6. pp. 780-784.
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