This study was designed to address to improve the durability of the external fixation of pelvic fractures. 4mm and 5mm Hoffman Pins, 5mm Ace Fischer Pin, 6mm Ace Hip Pin and Miami Pelvic Screw were screwed in different places of the iliac crest and measured pull out strength. 5mm Ace Fischer Pins which were seated in anterior part of the ilium and which were penetrated in anterior part of the cortex of the ilium were loaded three times at the tip of the pins and then resulting loosning was investigated. We investigated if a drill guid would help to screw pins into the ilium not penetrating the cortex of the ilium.
The posterior and mid regions of the ilium had weaker bone for screw fixation than the anterior region. Thread length and configuration had the most dramatic effect on pullout strength. The pins seated within the ilium had better durability than the pins penetrated the cortex of the ilium. A drill guide helped to screw into the ilium not penetrating the cortex of the ilium.
