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Absorbable sternal pins improve sternal closure stability within a small deviation.

Hiroshi Koshiyama1, Kenji Yamazaki

  • 1Department of Cardiovascular Surgery, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan, hkoshi.md@gmail.com.

General Thoracic and Cardiovascular Surgery
|February 28, 2015
PubMed
Summary
This summary is machine-generated.

Adding a sternal pin to sternal wire closure significantly enhances sternotomy stability in anterior-posterior and cranial-caudal directions. This improved fixation using a hydroxyapatite/poly-L-lactide acid (HA/PLLA) sternal pin is crucial for better patient outcomes.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Medical Device Engineering

Background:

  • Sternal wire fixation is standard for sternotomy closure but offers limited stability in anterior-posterior and cranial-caudal directions.
  • Sternal pain associated with fixation methods necessitates exploring stable yet minimally invasive techniques.
  • Sternal pins offer potential for improved fixation stability.

Purpose of the Study:

  • To evaluate the efficacy of a sternal pin in enhancing sternotomy closure stability.
  • To assess the impact of a small deviation technique using sternal pins on fixation strength.
  • To compare the stability of sternal wire fixation versus combined wire and sternal pin fixation in three directions.

Main Methods:

  • Polyurethane foam models simulating sternal bone were used for biomechanical testing.
  • Two groups were established: sternal wire fixation and combined sternal wire with hydroxyapatite/poly-L-lactide acid (HA/PLLA) sternal pin fixation.
  • Models were subjected to shear stress in anterior-posterior, cranial-caudal, and lateral directions, measuring load at 1-mm displacement.

Main Results:

  • The wire and sternal pin group demonstrated significantly higher load-bearing capacity in the anterior-posterior (138.8 N vs 51.6 N) and cranial-caudal (148.0 N vs 83.1 N) directions compared to the wire-only group (p < 0.001).
  • No significant difference in stability was observed in the lateral direction between the two groups (273.2 N vs 266.9 N, p = 0.8323).
  • The HA/PLLA sternal pin significantly improved fixation strength in critical planes.

Conclusions:

  • Additional internal fixation with an HA/PLLA sternal pin significantly enhances sternotomy closure stability.
  • Improved stability was most pronounced in the anterior-posterior and cranial-caudal directions, addressing key limitations of wire-only fixation.
  • Sternal pin augmentation represents a promising strategy for robust sternotomy repair.