Insertion force measurement of cervical traction tongs: a biomechanical study
| Autor: | Aleksandar Curcin, Vincent P. Novak, Stephen M. Belkoff, Kamala Littleton |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Male
medicine.medical_specialty Compressive Strength medicine.medical_treatment Cadaver Traction medicine Humans Orthopedics and Sports Medicine Displacement (orthopedic surgery) Orthodontics End point Osteosynthesis business.industry Skull Biomechanics Temporal Bone General Medicine Traction (orthopedics) Middle Aged Cervical traction Surgery Biomechanical Phenomena business Cadaveric spasm |
| Zdroj: | Journal of orthopaedic trauma. 14(7) |
| ISSN: | 0890-5339 |
| Popis: | OBJECTIVES To measure the insertion forces for various cervical traction tong pins and the force required to penetrate cadaveric skull specimens. DESIGN Cadaveric study testing tong pin forces. METHODS Insertion force and pin indicator displacement were measured in three tongs from each of three manufacturers (PMT, Depuy Ace, Gardner-Wells) after tightening pins per the manufacturer's recommendations and beyond. The force required for skull penetration was measured by driving each pin into cadaveric temporal specimens until the specimen failed or was penetrated. RESULTS Forces generated at the recommended pin settings were: PMT, 141 +/- 12 newtons; Ace, 0 +/- 0 newtons; Gardner-Wells, 132 +/- 9 newtons. The Ace tong required 1.0-millimeter indicator protrusion beyond manufacturer's recommended setting before generating clinically significant forces (120 +/- 8 newtons). Unlike the PMT and Ace pins, overtightening of the Gardner-Wells pins (by as little as 0.3 mm beyond recommended indicator displacement) resulted in substantially larger pin force (>448 newtons). Average failure loads of the temporal bone specimens were: PMT, 721 +/- 298 newtons; Ace, 636 +/- 351 newtons; Gardner-Wells, 965 +/- 227 newtons. CONCLUSIONS Although pin forces generated at the recommended end point for PMT and Gardner-Wells tongs appear safe, insufficient force was generated for Ace tongs. Furthermore, overtightening of the Gardner-Wells pins generated loads in excess of those that may be required to penetrate the skull. |
| Databáze: | OpenAIRE |
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