Cadaveric biomechanical study testing how stepwise anterior glenoid bone defects affect shoulder stability. Defects were created at the 3 o'clock position, reflecting CT-documented real-world defect locations, not the traditionally assumed anteroinferior site. The study aimed to define a critical defect size threshold to guide surgical decision-making.
Before this paper, the biomechanical case for bony reconstruction was built on anteroinferior defect models — but CT data from Saito et al. And Griffith et al. Showed real defects cluster at 3 o'clock, not 4:30.
This study tested the anatomically correct location and found the critical threshold is essentially the same: ≥20% of glenoid length triggers a biomechanically significant loss of bony stability, regardless of whether the defect sits at 3 o'clock or 4:30.
When you measure an anterior glenoid defect on CT or at arthroscopy and it reaches 20% of glenoid length, soft-tissue Bankart repair alone leaves the concavity-compression mechanism critically compromised. Bony reconstruction (Latarjet or iliac crest graft) belongs in the conversation.
Do not be falsely reassured by a defect that appears "purely anterior" rather than anteroinferior: the thresholds are equivalent, and the clinical decision rule is the same.
Cadaveric biomechanical study testing how stepwise anterior glenoid bone defects affect shoulder stability. Defects were created at the 3 o'clock position, reflecting CT-documented real-world defect locations, not the traditionally assumed anteroinferior site. The study aimed to define a critical defect size threshold to guide surgical decision-making.
Before this paper, the biomechanical case for bony reconstruction was built on anteroinferior defect models — but CT data from Saito et al. And Griffith et al. Showed real defects cluster at 3 o'clock, not 4:30.
This study tested the anatomically correct location and found the critical threshold is essentially the same: ≥20% of glenoid length triggers a biomechanically significant loss of bony stability, regardless of whether the defect sits at 3 o'clock or 4:30.
When you measure an anterior glenoid defect on CT or at arthroscopy and it reaches 20% of glenoid length, soft-tissue Bankart repair alone leaves the concavity-compression mechanism critically compromised. Bony reconstruction (Latarjet or iliac crest graft) belongs in the conversation.
Do not be falsely reassured by a defect that appears "purely anterior" rather than anteroinferior: the thresholds are equivalent, and the clinical decision rule is the same.