Fabrice Alexander Külling1, Lukas Ebneter2, Georg Stefan Rempfler3, Vilijam Zdravkovic2. 1. Department of Orthopaedics and Traumatology, Kantonsspital St. Gallen, Rorschacherstrasse 95, 9007, St. Gallen, Switzerland. fabrice.kuelling@kssg.ch. 2. Department of Orthopaedics and Traumatology, Kantonsspital St. Gallen, Rorschacherstrasse 95, 9007, St. Gallen, Switzerland. 3. Swiss Federal Institute of Technology in Zurich (ETH), Zurich, Switzerland.
Abstract
PURPOSE: To prove that a modified closing mechanism of the rongeur gives better precision compared to the old Kerrison rongeur. METHODS: Forty persons from the departments of orthopaedic surgery, urology and neurosurgery (35 orthopaedic, 2 urology and 3 neurosurgery) took part in the study. All participants were asked to punch ten times in a first step with either the old Kerrison rongeur with the scissors-like handle or the modified punch with a new parallel closing mechanism. In a second step, they punched 10 times with the other instrument. Shaft movement in three dimensions was measured with a stereoscopic, contactless, full-field digital image correlation system. RESULTS: The new rongeur is significantly more precise with less movement in all three dimensions. The mechanical model of the new rongeur shows that the momentum needed to keep the tip at the initial position changes only minimally during the closing act on the new model. CONCLUSION: The new rongeur is more precise compared to the old Kerrison model. It is more robust against changes in the direction of the finger forces and may reduce soreness, fatigue and CTS in spine surgeons. LEVEL OF EVIDENCE: Not applicable: technical study.
PURPOSE: To prove that a modified closing mechanism of the rongeur gives better precision compared to the old Kerrison rongeur. METHODS: Forty persons from the departments of orthopaedic surgery, urology and neurosurgery (35 orthopaedic, 2 urology and 3 neurosurgery) took part in the study. All participants were asked to punch ten times in a first step with either the old Kerrison rongeur with the scissors-like handle or the modified punch with a new parallel closing mechanism. In a second step, they punched 10 times with the other instrument. Shaft movement in three dimensions was measured with a stereoscopic, contactless, full-field digital image correlation system. RESULTS: The new rongeur is significantly more precise with less movement in all three dimensions. The mechanical model of the new rongeur shows that the momentum needed to keep the tip at the initial position changes only minimally during the closing act on the new model. CONCLUSION: The new rongeur is more precise compared to the old Kerrison model. It is more robust against changes in the direction of the finger forces and may reduce soreness, fatigue and CTS in spine surgeons. LEVEL OF EVIDENCE: Not applicable: technical study.
Entities:
Keywords:
Accuracy; Decompression; Laminectomy; Parallel closing mechanism; Rongeur; Spine surgery
Authors: Christian Herren; Rolf Sobottke; Anne F Mannion; Thomas Zweig; Everard Munting; Philippe Otten; Tim Pigott; Jan Siewe; Emin Aghayev Journal: Eur Spine J Date: 2017-06-20 Impact factor: 3.134
Authors: Michael G Fehlings; Justin S Smith; Branko Kopjar; Paul M Arnold; S Tim Yoon; Alexander R Vaccaro; Darrel S Brodke; Michael E Janssen; Jens R Chapman; Rick C Sasso; Eric J Woodard; Robert J Banco; Eric M Massicotte; Mark B Dekutoski; Ziya L Gokaslan; Christopher M Bono; Christopher I Shaffrey Journal: J Neurosurg Spine Date: 2012-02-10