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[Experimental study on improving stability of anchor by adding anchor].

Yi-Long Dong1, Yue-Nan Qian1, Lue Liu1

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Summary

Adding a second anchor significantly improves the holding force of rotator cuff anchors in osteoporotic bone. This dual-anchor technique offers a solution for rotator cuff repair in patients with osteoporosis.

Keywords:
BiomechanicsFemur headOsteoporosis

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Geriatric Medicine

Background:

  • Osteoporosis presents challenges for rotator cuff repair due to compromised bone quality.
  • Standard single-anchor fixation may lead to anchor failure in osteoporotic bone.

Purpose of the Study:

  • To evaluate the efficacy of modified anchor placement techniques in enhancing fixation strength for rotator cuff injuries in osteoporotic bone.
  • To address the clinical challenge of rotator cuff repair in elderly patients with osteoporosis.

Main Methods:

  • Twenty-one osteoporotic bone modules were divided into three groups (A, B, C) with 7 modules each.
  • Group A: single anchor insertion. Group B: two parallel anchors. Group C: sequential insertion of two anchors.
  • Maximum axial pull-out force (Fmax) was measured, and X-ray examination was performed.

Main Results:

  • The mean Fmax was 170.35±31.21 N for group A, 314.47±23.47 N for group B, and 292.74±25.36 N for group C.
  • Groups B and C demonstrated a statistically significant improvement in Fmax compared to group A (P<0.05).
  • No significant difference in Fmax was observed between group B and group C (P>0.05).

Conclusions:

  • Employing an additional anchor significantly enhances the holding force of anchors in osteoporotic bone.
  • This dual-anchor technique provides a viable solution to mitigate single-anchor failure in clinical rotator cuff repair.
  • The findings support improved surgical outcomes for rotator cuff injuries in osteoporotic patients.