Ideal pin length and interval in tension band wiring using ring pins for transverse olecranon fractures: a biomechanical study

Inserting two ring pins in parallel at a 10-mm interval with a length of ≥ 70 mm for TBW in transverse olecranon fractures is recommended. Further widening of the pin interval provides no biomechanical benefit and may result in technical difficulties owing to the anatomical features of the ulna; in summary, 50-mm ring pins show significantly lower mechanical strength.