Investigation of how different halos influence pin forces

This study investigated the effect of the size and material of halo rings on the pin force produced at the halo pin-calvarium complex. Loosening of halo pins has been a problem with using the halo-vest apparatus to stabilize cervical spine fractures. One standard halo pin and seven different halo ri...

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Bibliographic Details
Published in:Spine (Philadelphia, Pa. 1976) Pa. 1976), 1994-05, Vol.19 (9), p.1078-1081
Main Authors: KERWIN, G. A, CHOU, K. L, WHITE, D. B, KUN-LING SHEN, SALICCIOLI, G. G, YANG, K. H
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Biological and medical sciences
Bone Nails
Cervical Vertebrae - injuries
Diseases of the osteoarticular system. Orthopedic treatment
External Fixators
Graphite
Humans
Medical sciences
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Skull
Spinal Fractures - surgery
Stainless Steel
Stress, Mechanical
Traction - instrumentation
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Summary:This study investigated the effect of the size and material of halo rings on the pin force produced at the halo pin-calvarium complex. Loosening of halo pins has been a problem with using the halo-vest apparatus to stabilize cervical spine fractures. 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). Pin force fluctuated from halo to halo, and decreased as the nut was tightened. Identical torques applied to different halos will not guarantee the same magnitude of pin force for halo fixation.
ISSN:0362-2436
1528-1159
DOI:10.1097/00007632-199405000-00016