Anchor hole placement for Bankart repairs and its interaction with variable size Hill-Sachs defects-minimizing risk of glenoid rim fractures

Danè Dabirrahmani*, Desmond Bokor, Thomas Tarento, Shahrulazua Ahmad, Richard Appleyard

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

As the use of glenoid suture anchors in arthroscopic and open reconstruction, for instability after Bankart lesions of the shoulder, increases, an emerging problem has been the incidence of glenoid rim fractures through suture drill holes. Very little is known regarding the effect of the Hill-Sachs lesion on the glenoid's susceptibility to fracture and how drill hole location can further affect this. This study used finite element modeling techniques to investigate the risk of fracture of the glenoid rim in relation to variable sized Hill-Sachs defects impacting on the anterior glenoid edge with suture anchor holes placed in varying positions. The distribution of Von Mises (VM) stresses and the factor of safety (FOS) for each of the configurations were calculated. The greatest peak in VM stresses was generated when the glenoid was loaded with a small Hill-Sachs lesion. The VM stresses were lessened and the FOS increased (reducing likelihood of failure) with increasing size of the Hill-Sachs lesion. Placement of the suture drill holes at 2 mm from the glenoid rim showed the highest risk of failure; and when combined with a medium sized Hill-Sachs lesion, which matched the central line of the drill holes, a potentially clinically significant configuration was presented. The results of this study are useful in assisting the surgeon in understanding the interaction between the Hill-Sachs lesion size and the placement of suture anchors with the purpose of minimizing the risk of subsequent rim fracture with new injury.

Original languageEnglish
Article number101003
Pages (from-to)1-6
Number of pages6
JournalJournal of Biomechanical Engineering
Volume141
Issue number10
Early online date8 Jun 2019
DOIs
Publication statusPublished - 1 Oct 2019

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Keywords

  • finite element analysis
  • fracture risk
  • glenoid
  • Hill-Sachs lesion
  • shoulder

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