Biomechanical analysis of single- versus double-screw fixation in slipped capital femoral epiphysis at physiological load levels

Leonard J. Kibiloski, Robert M. Doane, Lori A. Karol, Roger C. Haut, Randall T. Loder

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Slipped capital femoral epiphyses in 12 pairs of bovine femora were pinned with a single screw on one side and two screws on the other. The specimens were subjected to physiological shear loads across the epiphysis (100 cycles at 1.1 Hz; 400 N for slow walking, and 900 N for fast walking). The rates of creep were decreased 23% with double screws compared to single screws at slow walking, and 30% at fast walking; this was not statistically significant. Single-screw fixation in slipped epiphyses is thus recommended, because the small gains in resistance to cyclic creep at physiological loading were not statistically different, and did not offset the increased risks of complications with multiple screws.

Original languageEnglish (US)
Pages (from-to)627-630
Number of pages4
JournalJournal of Pediatric Orthopaedics
Volume14
Issue number5
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

Keywords

  • Bovine femur
  • Cyclic creep
  • Physiological load
  • Single- or double-screw fixation
  • Slipped capital femoral epiphysis

ASJC Scopus subject areas

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

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