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Louie PK, Alostaz M, Bansal A, Drolet CE, Gyawali P, Khan N, Vivelo N, Farrokhi F. A Tubular-Mounted Digital Camera Versus Optical Surgical Microscope for Minimally Invasive Lumbar Decompression Surgery: The Impact on Operative Times, Ergonomics, and Workflow. World Neurosurg 2024; 184:e65-e71. [PMID: 38218447 DOI: 10.1016/j.wneu.2024.01.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/15/2024]
Abstract
OBJECTIVE Understanding ergonomic impact is foundational to critically evaluating value and safety of enabling technologies in minimally invasive spine surgeries. This study assessed the impact of a tubular-mounted digital camera (TMDC) versus an optical surgical microscope (OSM) in single-level minimally invasive spine surgeries on operative times, durotomy rate, surgeon ergonomics, safety, and operating room workflow. METHODS This retrospective study compared consecutive single-level minimally invasive lumbar decompression surgeries in a TMDC cohort (September 2021-June 2022) with an historical OSM cohort (January 2020-July 2021). Data included patient demographics, operative times, durotomy incidence, surgeon ergonomics (Rapid Entire Body Assessment scores), and equipment impact via staff surveys. Operative times were assessed by t test, while Pearson χ2 test compared sex. Age, body mass index, and Charlson Comorbidity Index comparisons were made by Wilcoxon rank sum tests, and survey results were analyzed with Wilcoxon signed rank tests. RESULTS TMDC and OSM groups included 74 and 82 patients, respectively. Age, sex, and Charlson Comorbidity Index did not significantly differ between groups. The TMDC group had a higher body mass index (29.6 ± 5.1) than the OSM group (29.0 ± 7.5) (P = 0.04). The TMDC group had significantly shorter operative times (57.3 ± 16.6 minutes) than the OSM group) (66.7 ± 22.5 minutes) (P = 0.004), with no difference in durotomy rates (P = 0.42). TMDC use yielded lower Rapid Entire Body Assessment scores compared with OSM (4.1 ± 0.77) (P < 0.001). Surveys indicated improved safety, setup time, and workflow with TMDC (P < 0.001). CONCLUSIONS TMDC in single-level minimally invasive lumbar decompression surgery improved surgeon ergonomics, reduced operative times, and maintained durotomy rates, enhancing operating room efficiency. Evaluating ergonomic impact of technology is vital for safety and value assessment.
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Affiliation(s)
- Philip K Louie
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA.
| | - Murad Alostaz
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Aiyush Bansal
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Caroline E Drolet
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Purnima Gyawali
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Nadia Khan
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Nicole Vivelo
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
| | - Farrokh Farrokhi
- Center for Neurosciences and Spine, Department of Neurosurgery, Virginia Mason Franciscan Health, Seattle, Washington, USA
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Campbell RG, Douglas RG, Zadro J, Gamble A, Chan CL, Mackey MG, Pappas E. Don't Just Stand There. Rethinking the Ideal Body Posture for Otorhinolaryngologists. Ann Otol Rhinol Laryngol 2024; 133:355-362. [PMID: 38044532 DOI: 10.1177/00034894231214035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Surgeons have a high rate of work-related musculoskeletal injuries; an area that has received little attention. These injuries result in surgeons performing less efficiently, needing to take time off work, suffering higher rates of burnout, and may ultimately lead surgeons to retire earlier than planned. Otorhinolaryngologists are at particular risk for work-related musculoskeletal injuries. Beyond the clinician, sustaining such injuries can negatively impact patient safety. Ergonomic interventions have been used effectively to reduce work-related musculoskeletal injuries in other professions, yet not in surgery. With traditional teachings of ideal body postures to avoid injury and manual handling training being re-evaluated, it is important to explore evidence based interventions for reducing work-related musculoskeletal injuries in otorhinolaryngologists. New research encourages us to shift the focus away from the traditional one-size-fits-all approach to ergonomics and toward postural recommendations and education that promote a dynamic, individualized approach to avoiding sustained, static and awkward postures.
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Affiliation(s)
- Raewyn G Campbell
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie Park, NSW, Australia
| | - Richard G Douglas
- Faculty of Medical and Health Sciences, Surgery, University of Auckland, Auckland, New Zealand
| | - Joshua Zadro
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Andrew Gamble
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Cliffton L Chan
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie Park, NSW, Australia
| | - Martin G Mackey
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Evangelos Pappas
- Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW, Australia
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Alkosha HM, Mohammed MIR, Amen MM. Risk Assessment and Prevalence of Work-Related Musculoskeletal Disorders Among Cranial and Spinal Neurosurgeons. World Neurosurg 2023; 176:e151-e161. [PMID: 37178909 DOI: 10.1016/j.wneu.2023.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/04/2023] [Accepted: 05/05/2023] [Indexed: 05/15/2023]
Abstract
OBJECTIVE To assess the risk and prevalence of work-related musculoskeletal disorders (WMSDs) in spine and cranial surgeons. METHODS A cross-sectional analytic study composed of a risk assessment and a questionnaire-based survey was conducted. The risk assessment for WMSDs was performed on young volunteer neurosurgeons using the Rapid Entire Body Assessment tool. The survey-based questionnaire was distributed using the Google Forms software among the relevant official WhatsApp groups of the Egyptian Society of Neurological Surgeons and the Egyptian Spine Association. RESULTS Thirteen volunteers with a median service of 8 years were assessed for the risk of WMSDs, showing moderate to very high risk of WMSDs, with a Risk Index >1 for all assessed postures. A total of 232 respondents completed the questionnaire, 74% of whom reported WMSD symptoms. Pain was experienced by most (96%), with neck pain being the most common (62.8%), followed by low back pain (56.0%), shoulder pain (44.5%), and wrist/finger pain (43.9%). Pain was experienced for 1-3 years by most respondents; however, most did not reduce their case volume, seek medical advice, or stop working when they experienced pain. The survey showed shortage in the literature studying ergonomics, calling for more ergonomic education and furnishing of working environment of neurosurgeons. CONCLUSIONS WMSDs are prevalent among neurosurgeons, affecting their ability to work. Ergonomics need further awareness, education, and interventions to reduce WMSDs, especially neck and low back pain, which proved to substantially interfere with work ability.
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Affiliation(s)
- Hazem M Alkosha
- Department of Neurosurgery, Mansoura University, Dakahlia, Egypt.
| | | | - Mohamed M Amen
- Department of Neurosurgery, Mansoura University, Dakahlia, Egypt
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Mavrovounis G, Meling TR, Lafuente J, Fountas KN, Demetriades AK. Tools and Modalities for Postural Ergonomics Research in Surgery and Neurosurgery. ACTA NEUROCHIRURGICA. SUPPLEMENT 2023; 135:15-20. [PMID: 38153443 DOI: 10.1007/978-3-031-36084-8_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Work-related musculoskeletal disorders (WMSDs) are common amongst neurosurgeons and can affect a surgeon's ability to operate. Performing surgical ergonomics research is important to minimize the prevalence and effect of WMSDs on the surgeons. The aim of this review is to highlight some of the most important objective and subjective tools available for surgical ergonomics research. Subjective tools can be divided into three categories: (1) questionnaires (either validated or non-validated) filled out by the participants, (2) survey assessments/standardized scoring systems filled out by the researchers, and (3) video analysis. Subjective tools have the drawbacks of recall bias and intra-rater and inter-rater variability. Some of the most important objective tools available are surface electromyography, force plate/pressure sensors analysis, inertial measurement units (IMUs) and kinematics data capturing using reflective markers. Although these modalities do not have the drawbacks that hinder the use of subjective tools, using most of them in the real-life operating theatre, with the exception of IMUs, is challenging. Conducting surgical ergonomics research is important to optimize the performance of neurosurgeons. The advancements towards wearable, wireless technologies will make it easier for surgeons to perform ergonomics research in the operating room.
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Affiliation(s)
- Georgios Mavrovounis
- Department of Neurosurgery, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Torstein R Meling
- Department of Neurosurgery, The National Hospital of Denmark, Rigshospitalet, Copenhagen, Denmark
| | | | - Konstantinos N Fountas
- Department of Neurosurgery, Faculty of Medicine, University of Thessaly, Larissa, Greece
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Xu AL, Covarrubias OG, Yakkanti RR, Sotsky RB, Aiyer AA. The Biomechanical Burden of Orthopaedic Procedures and Musculoskeletal Injuries Sustained by Orthopaedic Surgeons: A Systematic Review. JBJS Rev 2023; 11:01874474-202301000-00010. [PMID: 36722828 DOI: 10.2106/jbjs.rvw.22.00202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Orthopaedic surgeons are at high risk for experiencing work-related musculoskeletal (MSK) injuries and chronic pain due to repetitive large magnitude forces, altered posture from lead vests, and prolonged irregular body positions. We sought to synthesize available evidence regarding (1) the biomechanics of orthopaedic surgery and (2) MSK injuries sustained by orthopaedic surgeons with subsequent treatment and consequences. METHODS To conduct this systematic review, we queried 4 databases (PubMed, Embase, MEDLINE, and Web of Science) for original research studies presenting on the biomechanics of orthopaedic surgery or MSK injuries sustained by orthopaedic surgeons. Studies were excluded if they were not original research (i.e., reviews) or reported on non-MSK injuries and injuries in patients or nonorthopaedic specialists. The literature search yielded 3,202 publications, 34 of which were included in the final analysis. RESULTS Eight studies reported on the biomechanics of orthopaedic surgery. Surgeons spent an average 41.6% of operating time slouched. Head and whole spine angles were closest to natural standing position when using a microscope for visualization and with higher surgical field heights. Use of lead aprons resulted in a shifted weight distribution on the forefoot, gain in thoracic kyphosis, and increase in lateral deviation from postural loading. Twenty-six studies reported on MSK symptoms and injuries experienced by orthopaedic surgeons, with an overall prevalence from 44% to 97%. The most common body regions involved were lower back (15.2%-89.5%), hip/thigh (5.0%-86.6%), neck (2.4%-74%), hand/wrist (10.5%-54%), shoulder (7.1%-48.5%), elbow (3.1%-28.3%), knee/lower leg (7.9%-27.4%), and foot/ankle (7%-25.7%). Of surgeons with any reported MSK symptom or injury, 27% to 65.7% required nonoperative treatment, 3.2% to 34.3% surgery, and 4.5% to 31% time off work. Up to 59.3% of surgeons reported that their injuries would negatively influence their ability to perform surgical procedures in the future. CONCLUSIONS The orthopaedic surgeon population experiences a high prevalence of MSK symptoms and injuries, likely secondary to the biomechanical burdens of tasks required of them during strenuous operations. LEVEL OF EVIDENCE Level III. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Amy L Xu
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Oscar G Covarrubias
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Ramakanth R Yakkanti
- Department of Orthopaedic Surgery, University of Miami Miller School of Medicine, Miami, Florida
| | - Rachel B Sotsky
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Amiethab A Aiyer
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland
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Kolz JM, Wagner SC, Vaccaro AR, Sebastian AS. Ergonomics in Spine Surgery. Clin Spine Surg 2022; 35:333-340. [PMID: 34321393 DOI: 10.1097/bsd.0000000000001238] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 06/23/2021] [Indexed: 11/26/2022]
Abstract
As physician burnout and wellness become increasingly recognized as vital themes for the medical community to address, the topic of chronic work-related conditions in surgeons must be further evaluated. While improving ergonomics and occupational health have been long emphasized in the executive and business worlds, particularly in relation to company morale and productivity, information within the surgical community remains relatively scarce. Chronic peripheral nerve compression syndromes, hand osteoarthritis, cervicalgia and back pain, as well as other repetitive musculoskeletal ailments affect many spinal surgeons. The use of ergonomic training programs, an operating microscope or exoscope, powered instruments for pedicle screw placement, pneumatic Kerrison punches and ultrasonic osteotomes, as well as utilizing multiple surgeons or microbreaks for larger cases comprise several methods by which spinal surgeons can potentially improve workspace health. As such, it is worthwhile exploring these areas to potentially improve operating room ergonomics and overall surgeon longevity.
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Affiliation(s)
- Joshua M Kolz
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN
| | - Scott C Wagner
- Walter Reed National Military Medical Center, Bethesda, MD
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Acharya H, Patel P, Shetty GM, Shah M, Bamb H, Nene A. Prevalence and risk factors of neck pain in spine surgeons - Are we our own patients? J Clin Orthop Trauma 2022; 33:102012. [PMID: 36110511 PMCID: PMC9467889 DOI: 10.1016/j.jcot.2022.102012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 06/04/2022] [Accepted: 08/27/2022] [Indexed: 10/14/2022] Open
Abstract
Aim This survey of spine surgeons aimed to determine the prevalence of neck pain and identify the associated risk factors. The prevalence of neck pain has been reported in various medical sub-specialities including laparoscopy surgeons, dentists, plastic surgeons, ophthalmologist, urologist and orthopaedic surgeons. However, the literature is lacking on prevalence and risk factors for neck pain in spine surgeons. Methods A survey questionnaire containing demographic, Neck pain and work practice details was administered to 300 spine surgeons (members of an online group) via text message and e-mail. Results One hundred and eighty surgeons responded to the survey (response rate, 60%). Three spine surgeons had previous cervical spine surgeries. The 1-month prevalence rate of neck pain was 74.4% (134/180 surgeons). One hundred and eighteen surgeons (88%) reported only neck pain, 16 surgeons (11.9%) had neck pain with radicular arm pain. Only 20.5% of surgeons used a loupe, 18% of surgeons used a microscope, and 24% of surgeons used operating table height at umbilicus during surgery. There was no significant difference between the mean age (p = 0.65), work experience (p = 0.8), time spent in surgery (p = 0.7), and operating table height preference (p = 0.4) when symptomatic and asymptomatic groups were compared. However, a significantly greater percentage of surgeons had a sedentary lifestyle (p = 0.002) & used loupes as compared to microscopes (p = 0.04) in the symptomatic group. There was significant correlation between the surgeon's lifestyle & use of loupe and the incidence of neck pain. Conclusion Spine surgeons have a higher prevalence of neck pain than general populations and surgeons from other specialties. Considering the high prevalence of neck pain, general health, work, and ergonomic guidelines and recommendations must be formulated to help prevent and decrease the burden of neck pain among spine surgeons.
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Affiliation(s)
- Hriday Acharya
- Dept of Spine Surgery, Lilavati Hospital & Research Center, Mumbai, India
| | - Priyank Patel
- Dept of Spine Surgery, Lilavati Hospital & Research Center, Mumbai, India
| | - Gautam M. Shetty
- Knee and Orthopaedic Clinic, Mumbai Head of Clinical Research, AIMD Research, India
| | - Munjal Shah
- Dept of Spine Surgery, Lilavati Hospital & Research Center, Mumbai, India
| | - Harshal Bamb
- Dept of Spine Surgery, Lilavati Hospital & Research Center, Mumbai, India
| | - Abhay Nene
- Dept of Spine Surgery, Lilavati Hospital & Research Center, Mumbai, India
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Virtual Reality Simulator Enhances Ergonomics Skills for Neurosurgeons. INT J SEMANT WEB INF 2022. [DOI: 10.4018/ijswis.297041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This paper aims to assess the needs of neurosurgical training in order to strategize the future plans for simulation and rehearsal. The project main objective is to investigate the ability virtual reality to enhance the training.An online questionnaire has been conducted among surgeons practicing in different countries across the globe. The study shows significant differences in rehearsal methods and surgical teaching methods practiced by the respondents. Among respondents, 90% did believe that virtual reality technology can serve surgical training, and almost all respondents agreed that there is a gap in the existing neurosurgical training in terms of operating room ergonomics. Adequate education on surgical ergonomics might lead to an improvement in the outcomes for both surgeon and patient. The contribution of the paper is two fold. From one side investigates the new requirements for the enhancement of Neurosurgenos’ training and adoption on Virtual Reality Simulator. From the other side contributes to the body of knowledge related to the required Ergonomics skills.
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Prevalence of Back and Neck Pain in Orthopaedic Surgeons in Western New York. J Am Acad Orthop Surg Glob Res Rev 2022; 6:01979360-202201000-00007. [PMID: 34989709 PMCID: PMC8740880 DOI: 10.5435/jaaosglobal-d-21-00252] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 11/29/2021] [Indexed: 11/18/2022]
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Lavé A, Gondar R, Demetriades AK, Meling TR. Ergonomics and musculoskeletal disorders in neurosurgery: a systematic review. Acta Neurochir (Wien) 2020; 162:2213-2220. [PMID: 32705353 PMCID: PMC7415019 DOI: 10.1007/s00701-020-04494-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/14/2020] [Indexed: 12/23/2022]
Abstract
Background Work-related musculoskeletal disorders (WMSDs) are a growing and probably undervalued concern for neurosurgeons and spine surgeons, as they can impact their quality of life and career length. This systematic review aims to ascertain this association and to search for preventive measures. Methods We conducted a PRISMA-P-based review on ergonomics and WMSDs in neurosurgery over the last 15 years. Twelve original articles were included, of which 6 focused on spine surgery ergonomics, 5 cranio-facial surgery (mainly endoscopic), and one on both domains. Results We found a huge methodological and content diversity among studies with 5 surveys, 3 cross-sectional studies, 2 retrospective cohorts, and 2 technical notes. Spine surgeons have sustained neck flexion and neglect their posture during surgery. In a survey, low back pain was found in 62% of surgeons, 31% of them with a diagnosed lumbar disc herniation, and 23% of surgery rate. Pain in the neck (59%), shoulder (49%), finger (31%), and wrist (25%) are more frequent than in the general population. Carpal tunnel syndrome showed a linear relationship with increasing cumulative hours of spine surgery practice. Among cranial procedures, endoscopy was also significantly related to shoulder pain while pineal region surgery received some attempts to optimize ergonomics. Conclusions Ergonomics in neurosurgery remains underreported and lack attention from surgeons and authorities. Improvements shall target postural ergonomics, equipment design, weekly schedule adaptation, and exercise.
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Affiliation(s)
- Alexandre Lavé
- Department of Clinical Neurosciences, Division of Neurosurgery, Geneva University Hospitals, Geneva, Switzerland
| | - Renato Gondar
- Department of Clinical Neurosciences, Division of Neurosurgery, Geneva University Hospitals, Geneva, Switzerland
| | | | - Torstein R Meling
- Department of Clinical Neurosciences, Division of Neurosurgery, Geneva University Hospitals, Geneva, Switzerland.
- Faculty of Medicine, University of Geneva, Geneva, Switzerland.
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Park JY, Kim KH, Kuh SU, Chin DK, Kim KS, Cho YE. Joint kinematics of surgeons during lumbar pedicle screw placement. Int J Med Robot 2015; 12:701-709. [PMID: 26443712 DOI: 10.1002/rcs.1708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/25/2015] [Accepted: 08/21/2015] [Indexed: 11/09/2022]
Abstract
BACKGROUND A surgical robot for spine surgery has recently been developed. The objective is to assess the joint kinematics of the surgeon during spine surgery. METHODS We enrolled 18 spine surgeons, who each performed pedicle screw placement, and used an optoelectronic motion analysis system. Using three-dimensional (3D) motion images, distance changes in five joints and angle changes in six joints were calculated during surgery. RESULTS Distance fluctuations increased gradually from the proximal to the distal joint. Angle fluctuations were largest at the distal point but did not gradually increase, and the elbow showed the second largest fluctuation. Changes along the X axis were larger than those of the Y and Z axes. CONCLUSION The distances gradually increased from proximal portions of the body to the hand. In angle changes, the elbow was most dynamic during pedicle screw placement. The surgeons' whole joints carry out a harmonic role during lumbar pedicle screw placement. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Jeong-Yoon Park
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Kyung-Hyun Kim
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Sung-Uk Kuh
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Dong-Kyu Chin
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Keun-Su Kim
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Yong-Eun Cho
- Department of Neurosurgery, Gangnam Severance Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
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