Insertional torque and pullout strength of reinserted screws for sacroiliac joint fusion: Effects of implant dimensions, bone density, and tapping.

ABSTRACT:

Background

Sacroiliac joint (SIJ) fusion is a common procedure for SIJ pain and dysfunction. Traditional threaded screws offer limited bony integration, prompting the development of additively manufactured, porous implants aimed at enhancing osseointegration. However, data on their insertional mechanics and pullout strength, especially in revision scenarios, remain sparse. This study aimed to investigate the influence of bone density, tapping, and implant size on re-insertional torque and pullout strength.

Methods

Mechanical testing was conducted in accordance with ASTM F543, using 10 and 20 PCF polyurethane foam blocks to simulate low and normal-density bone, respectively. A 10 × 35 mm screw fusion device served as the control. For subsequent tests, the 10 × 35 mm screw was

SUBMITTER: Hendricks CJ 

PROVIDER: S-EPMC12269985 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature