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Purpose <p>Evidence supporting the mechanical superiority of the Gamma3 RC nail over the standard Gamma3 configuration remains limited. This pilot biomechanical study compared strain distribution and load-transfer behavior between both implants in a standardized unstable basicervical proximal femoral fracture model.</p> Methods <p>Six fourth-generation composite femora were allocated into three groups: one intact reference specimen, three fractures stabilized with a standard Gamma3 nail, and three fractures stabilized with a Gamma3 RC nail incorporating a U-blade lag screw. Mechanical testing consisted of controlled low-load axial-oblique loading under standardized conditions. Four synchronized strain-gauge rosettes recorded cortical deformation at the proximal femur.</p> Results <p>The Gamma3 RC construct demonstrated consistently lower strain magnitudes at the medial cortices and preserved a more linear strain–load response throughout the tested loading range compared with the standard Gamma3 configuration (Δε = 18.6 με and − 26.5 με). Differences between constructs became progressively more evident with increasing load (Δε = 180.9 με and − 62.9 με), particularly at the proximal medial cortex, where the standard Gamma3 showed greater strain concentration and early nonlinearity.</p> Conclusion <p>In this exploratory synthetic-femur model, the Gamma3 RC nail demonstrated a mechanical trend toward more homogeneous load distribution and improved rotational control compared with the standard Gamma3 nail.</p>

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Comparative strain‑gauge analysis of Gamma3 and Gamma3 reconstruction nails in unstable basicervical femur fractures: a pilot biomechanical study

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Jose Antonio Valle-Cruz,
  • Yaiza Lopiz,
  • Daniel Garríguez-Pérez,
  • Alberto Francés-Borrego,
  • Antonio Ros Felip,
  • Fernando Marco

摘要

Purpose

Evidence supporting the mechanical superiority of the Gamma3 RC nail over the standard Gamma3 configuration remains limited. This pilot biomechanical study compared strain distribution and load-transfer behavior between both implants in a standardized unstable basicervical proximal femoral fracture model.

Methods

Six fourth-generation composite femora were allocated into three groups: one intact reference specimen, three fractures stabilized with a standard Gamma3 nail, and three fractures stabilized with a Gamma3 RC nail incorporating a U-blade lag screw. Mechanical testing consisted of controlled low-load axial-oblique loading under standardized conditions. Four synchronized strain-gauge rosettes recorded cortical deformation at the proximal femur.

Results

The Gamma3 RC construct demonstrated consistently lower strain magnitudes at the medial cortices and preserved a more linear strain–load response throughout the tested loading range compared with the standard Gamma3 configuration (Δε = 18.6 με and − 26.5 με). Differences between constructs became progressively more evident with increasing load (Δε = 180.9 με and − 62.9 με), particularly at the proximal medial cortex, where the standard Gamma3 showed greater strain concentration and early nonlinearity.

Conclusion

In this exploratory synthetic-femur model, the Gamma3 RC nail demonstrated a mechanical trend toward more homogeneous load distribution and improved rotational control compared with the standard Gamma3 nail.