Proximal femoral physis shear in slipped capital femoral epiphysis - A finite element study

Zair Fishkin, Douglas Armstrong, Hardik Shah, Abani Patra, William M. Mihalko

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


The following finite element study was conducted to determine whether increased body weight, femoral retroversion, and varus hip loading could sufficiently raise physeal shear strains and stresses above the yield point and predispose an adolescent hip to a slip. A computer tomography scan of a 13-year-old child with slipped capital femoral epiphysis was used to generate a solid model of the proximal femur and physis. The model was parameterized using 3-dimensional software to generate three difference angles of femoral neck version-neutral, 15°retroversion, and 15°anteversion. Loads of 2.7 times body weight in a 46- and 86-kg child were applied to the proximal femur to model stance on one leg. In addition, the loading vector was reoriented at various degrees of varus to study the effect of varus loading on physis shear. The results demonstrated that physis stress, strain, and displacement increased with greater body weight, retroversion, and varus displacement of the loading vector. Physis shear strain in hips with a combination of varus loading and femoral neck retroversion exceeded the reported ultimate strain values for cartilaginous soft tissues. The finite element models suggest that in an overweight child, the combination of retroversion and varus hip load may be sufficient to increase physeal strains above the yield point and result in a slip.

Original languageEnglish (US)
Pages (from-to)291-294
Number of pages4
JournalJournal of Pediatric Orthopaedics
Issue number3
StatePublished - May 2006

All Science Journal Classification (ASJC) codes

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


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