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Investigation of how different halos influence pin forces
G A Kerwin1, K L Chou, D B White
1Department of Orthopaedic Surgery, Wayne State University, Detroit, Michigan.
Study Design:
This study investigated the effect of the size and material of halo rings on the pin force produced at the halo pin-calvarium complex.
Summary Of Background Data:
Loosening of halo pins has been a problem with using the halo-vest apparatus to stabilize cervical spine fractures.
Methods:
One standard halo pin and seven different halo rings were used to test the anterior pin hole of each ring at a constant torque of 8 inch-pounds (0.9 Nm).
Results:
Pin force fluctuated from halo to halo, and decreased as the nut was tightened.
Conclusions:
Identical torques applied to different halos will not guarantee the same magnitude of pin force for halo fixation.