The femoral head expandable peg: Improved periimplant bone properties following expansion in a cadaveric model

Nehemia Blumberg*, Nadav Shasha, Michael Tauber, Shmuel Dekel, Ely Steinberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The femoral head expandable peg offers a new concept of bone-device purchase treating proximal femur fractures. We describe the expansion influence on both the periimplant bone properties and the intraosseous pressure. Methods: A 10 × 8 mm cannulated peg consisting of a stainless steel oval-shaped transversely sectioned rod was tested on 13 femoral heads retrieved from patients with subcapital fracture treated by hemiarthroplasty. Normal saline solution was used to expand the diameter of its membrane from 7.8 to 10.5 mm, resulting in abutment of the distal peg to the compacted cancellous bone of the femoral head. The intraosseous pressure was monitored using a 1.4 mm drill-hole. Results: Dual-energy X-ray absorptiometry and microradiography demonstrated increased periimplant bone density following peg expansion, without significant increase in the intraosseous pressure. Conclusion: The new implant afforded improved periimplant bone density, less trabecular damage and preservation of bone stock, all contributing to reliable biomechanical support and potentially decreasing the high complication rate following screw fixation in osteoporotic femora. Further studies are needed in order to establish clinical safety and efficacy.

Original languageEnglish
Pages (from-to)526-532
Number of pages7
JournalArchives of Orthopaedic and Trauma Surgery
Volume126
Issue number8
DOIs
StatePublished - Oct 2006

Keywords

  • Dual-energy X-ray absorptiometry
  • Hip fracture
  • Hippeg
  • Microradiography
  • Osteoporosis

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