Related Experiment Video
Updated: Aug 7, 2026

Cantilever Bending of Murine Femoral Necks
Published on: January 5, 2022
[Shaft lengthening in hip replacement: experimental studies on bending stiffness]
K Burkhart1, D Mehler, J Degreif
1Klinik und Poliklinik für Unfallchirurgie, Universitätsklinikum, Langenbeckstrasse 1, 55131 Mainz. burkhart@unfall.klinik.uni-mainz.de
The elastic slotted hip prosthesis shaft lengthening (HSL) demonstrates comparable bending stiffness to the universal femoral nail, validating its use in hip revision arthroplasty for improved bone regeneration.
Area of Science:
- Orthopedic biomechanics
- Biomaterials science
- Surgical implant design
Context:
- Proximal femur cortical atrophy is a concern after total hip arthroplasty due to distal load bearing.
- Hip revision arthroplasty requires stable implantation and proximal bone regeneration.
- Shaft component lengthening aims to redistribute and concentrate loading forces proximally via elasticity.
Purpose:
- To evaluate the bending stiffness of an elastic slotted hip prosthesis shaft lengthening (HSL).
- To compare the HSL's biomechanical properties against the Synthes universal femoral nail (MN) and an unslotted HSL.
- To assess the suitability of the slotted HSL for hip revision arthroplasty.
Summary:
- A three-point bending study compared the bending stiffness of an elastic slotted HSL with the MN and an unslotted HSL.
- The slotted HSL exhibited significantly higher bending stiffness (1,287 N/mm) than the MN but lower (1,855 N/mm) than the unslotted HSL.
- The bending behavior of the slotted HSL was found to be more comparable to the MN.
Impact:
- The slotting significantly influences the bending stiffness of the elastic HSL.
- The slotted HSL's elasticity aligns with conventional intramedullary nailing principles.
- Results support the continued clinical use of the slotted HSL in hip revision arthroplasty.
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