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A combined partially threaded cancellous lag screw for achieving maximum compressive force without compromising

D-Q Xu1, P-D Sun, J Wang

  • 1Department of Orthopedics, The First Affiliated Hospital of Soochow University, Soochow, China. lin497420137@yeah.net.

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Summary

The combined partially threaded cancellous lag screw (CPTLS) achieves maximum compressive force without reducing pullout strength, regardless of bone mineral density. This finding is crucial for orthopedic implant stability.

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Area of Science:

  • Orthopedic biomechanics
  • Surgical implant technology
  • Bone mineral density research

Background:

  • Partially threaded cancellous lag screws (PTLS) have limitations in achieving maximum compressive force due to compromised pullout strength.
  • Combined partially threaded cancellous lag screws (CPTLS) offer potential for higher compressive forces.
  • The impact of CPTLS compression on pullout strength at maximum force, particularly across varying bone mineral densities (BMDs), remains unexplored.

Purpose of the Study:

  • To investigate whether pullout strength (POS) decreases at the point of maximum compressive force (C(MAX)) when using CPTLS for compression.
  • To evaluate this relationship across different bone mineral densities (BMDs).

Main Methods:

  • Utilized three synthetic cancellous bone blocks with BMDs of 0.12 g/cm³, 0.16 g/cm³, and 0.20 g/cm³.
  • Prepared 20 pilot holes (3.2 mm diameter) in each block.
  • Employed a custom device to insert CPTLS for measuring C(MAX) and conducted pullout tests for POS on identical screws.

Main Results:

  • No significant differences in C(MAX) or POS were observed across the tested BMDs.
  • The ratios of mean C(MAX) to mean POS were consistently similar across all specimens (ranging from 0.98 to 1.01).

Conclusions:

  • Maximum compressive force is achieved with CPTLS without a reduction in pullout strength.
  • This stability is maintained independently of the bone mineral density.