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Welborn MC, Redding G, Evers P, Nicol L, Bauer DF, Iyer RR, Poon S, Hwang S. Pre-op considerations in neuromuscular scoliosis deformity surgery: proceedings of the half day course at the 58th annual meeting of the Scoliosis Research Society. Spine Deform 2024:10.1007/s43390-024-00865-4. [PMID: 38634998 DOI: 10.1007/s43390-024-00865-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 03/16/2024] [Indexed: 04/19/2024]
Abstract
Scoliosis is a common complication of neuromuscular disorders. These patients are frequently recalcitrant to nonoperative treatment. When treated surgically, they have the highest risk of complications of all forms of scoliosis. While recent studies have shown an improvement in the rate of complications, they still remain high ranging from 6.3 to 75% depending upon the underlying etiology and the treatment center (Mohamad et al. in J Pediatr Orthop 27:392-397, 2007; McElroy et al. in Spine, 2012; Toll et al. in J Neurosurg Pediatr 22:207-213, 2018; Cognetti et al. in Neurosurg Focus 43:E10, 2017). For those patients who are able to recover from the perioperative period without major complications, several recent studies have shown decreased long-term mortality and improved health-related quality of life in neuromuscular patients who have undergone spine fusion (Bohtz et al. in J Pediatr Orthop 31:668-673, 2011; Ahonen et al. in Neurology 101:e1787-e1792, 2023; Jain et al. in JBJS 98:1821-1828, 2016). It is critically important to optimize patients preoperatively to minimize the risk of post-operative complications and maximize long-term outcomes. In order to do so, one must familiarize themselves with the common complications and their treatment. The most common complications are pulmonary in nature. With reported rates as high as 23-29%, pre-operative optimization should be employed for these patients to minimize the risk of post-operative complications (Sharma et al. in Eur Spine J 22:1230-1249, 2013; Rumalla et al. in J Neurosurg Spine 25:500-508, 2016). The next most common cause of complications are implant related, with 13-23% of patients experiencing an implant-related complication that may require a second procedure (Toll et al. in J Neurosurg Pediatr 22:207-213, 2018; Sharma et al. in Eur Spine J 22:1230-1249, 2013) Therefore optimization of bone quality prior to surgical intervention is important to help minimize the risk of instrumentation failure. Optimization of muscle tone and spasticity may help to decrease the risk of instrumentation complications, but may also contribute to the progression of scoliosis. While only 3% of patients have neurologic complication, significant equipoise remains regarding whether or not patients should undergo prophylactic detethering procedures to minimize those risks (Sharma et al. in Eur Spine J 22:1230-1249, 2013). Although only 1.8% of complications are classified as cardiac related, they can be among the most devastating (Rumalla et al. in J Neurosurg Spine 25:500-508, 2016). Simply understanding the underlying etiology and the potential risks associated with each condition (i.e., conduction abnormalities in a patient with Rett syndrome or cardiomyopathies patients with muscular dystrophy) can be lifesaving. The following article is a summation of the half day course on neuromuscular scoliosis from the 58th annual SRS annual meeting, summarizing the recommendations from some of the world's experts on medical considerations in surgical treatment of neuromuscular scoliosis.
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Affiliation(s)
- Michelle C Welborn
- Shriners Children's Portland, 3101 SW Sam Jackson Park Road, Portland, OR, 97229, USA.
| | - Gregory Redding
- Pulmonary and Sleep Medicine Division, Seattle Children's Hospital, Room O.C. 7.730, 4800 Sand Point Way N E, Seattle, WA, 98105, USA
| | - Patrick Evers
- Doernbecher Children's Hospital, 700 SW Campus Dr, Portland, OR, 97239, USA
| | - Lindsey Nicol
- Shriners Children's Portland, 3101 SW Sam Jackson Park Road, Portland, OR, 97229, USA
- Doernbecher Children's Hospital, 700 SW Campus Dr, Portland, OR, 97239, USA
| | - David F Bauer
- Texas Children's Hospital, 6701 Fannin St., Suite 1230.01, Houston, TX, USA
| | - Rajiv R Iyer
- , 100 N. Mario Capecchi Drive, Suite 3850, Salt Lake City, UT, 84113, USA
| | - Selina Poon
- Shriners Children's Southern California, 909 S. Fair Oaks Ave, Pasadena, CA, 91105, USA
| | - Steven Hwang
- Shriners Children's Philadelphia, 3551 N Broad St., Philadelphia, PA, 19140, USA
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Solitro GF, Welborn MC, Mehta AI, Amirouche F. How to Optimize Pedicle Screw Parameters for the Thoracic Spine? A Biomechanical and Finite Element Method Study. Global Spine J 2024; 14:187-194. [PMID: 35499547 PMCID: PMC10676166 DOI: 10.1177/21925682221099470] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
STUDY DESIGN Pedicle screw study. OBJECTIVE The selection of pedicle screw parameters usually involves the surgeon's analysis of preoperative CT imaging along with anatomical landmarks and tactile examination. However, there is minimal consensus on a standardized guideline for selection methods on pedicle screws. We aimed to determine the effects of thoracic screw diameter to pedicle width on pullout strength determined by cortical bone purchase. METHODS Biomechanical study performed with human cadaveric thoracic vertebrae and experimentally validated three-dimensional finite element model instrumented with pedicle screws of various diameters. We used a variable (SD/PW) ratio to express the screw selection. We hypothesized a positive correlation between the pullout load determined by the bone purchase and the SD/PW. This relationship was first investigated in a validated finite element model considering bone purchase related to the strength of an upper thoracic vertebra. Then, the correlation to the entire spine is evaluated. RESULTS The failure load ranged from 371.3 to 1601.0 N, respectively, for 3 and 6 mm screws. The determinant coefficient was increased to R2=.421 when a linear relationship between pullout load and the SD/PW ratio was used. The peak loads of 1216 and 1288N were found for an SD/PW ratio of .83. CONCLUSION We have found that the screw pullout load is more correlated to SD/PW than other pedicle measures for a maximized SD/PW ratio of .83. This particular value should be considered the upper limit of the indicated SD/PW ratio and a means to determine the optimal screw diameter to enhance pullout strength.
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Affiliation(s)
| | - Michelle C. Welborn
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, Il, USA
| | - Ankit I. Mehta
- Department of Orthopaedic Surgery, NorthShore University HealthSystem, Evanston, Il, USA
| | - Farid Amirouche
- Department of Orthopaedics, Louisiana State University, Chicago, Il, USA
- College of Medicine, University of Illinois at Chicago, Chicago, Il, USA
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Quan T, Matsumoto H, Bonsignore-Opp L, Ramo B, Murphy RF, Brooks JT, Welborn MC, Emans JB, Anari JB, Johnston CE, Akbarnia BA, McCarthy R, Flynn J, Sawyer JR, Vitale MG, Roye BD. Definition of Tweener: Consensus Among Experts in Treating Early-onset Scoliosis. J Pediatr Orthop 2023; 43:e215-e222. [PMID: 36729774 DOI: 10.1097/bpo.0000000000002321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND The term "Tweener" is colloquially used to refer to early-onset scoliosis (EOS) patients whose age and development make them candidates for multiple surgical options. The purpose of this study was to establish expert consensus on a definition to formally characterize the Tweener population. METHODS A 3-round survey of surgeons in an international EOS study group was conducted. Surgeons were provided with various patient characteristics and asked if each was part of their definition for Tweener patients. Responses were analyzed for consensus (≥70%), near-consensus (60% to 69%), and no consensus (<60%). RESULTS Consensus was reached (89% of respondents) for including chronological age in the Tweener definition; 8 to 10 years for females and 9 to 11 years for males. Surgeons agreed for inclusion of Sanders score, particularly Sanders 2 (86.0%). Patients who have reached Sanders 4, postmenarche, or have closed triradiate cartilage should not be considered Tweeners. Bone age range of 8 years and 10 months to 10 years and 10 months for females (12 y for males) could be part of the Tweener definition. CONCLUSIONS This study suggests that the Tweener definition could be the following: patients with open triradiate cartilage who are not postmenarche and have not reached Sanders 4, and if they have one of the following: Sanders 2 or chronological age 8 to 10 years for females (9 to 11 y for males) or bone age 8 years and 10 months to 10 years and 10 months for females (12 y for males). This definition will allow for more focused and comparative research on this population. LEVEL OF EVIDENCE Level V-expert opinion.
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Affiliation(s)
- Theodore Quan
- Department of Orthopaedic Surgery, Columbia University Irving Medical Center
| | - Hiroko Matsumoto
- Department of Orthopaedic Surgery, Columbia University Irving Medical Center.,Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY
| | - Lisa Bonsignore-Opp
- Department of Orthopaedic Surgery, Columbia University Irving Medical Center
| | - Brandon Ramo
- Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Scottish Rite for Children, Dallas, TX
| | - Robert F Murphy
- Department of Orthopaedics and Physical Medicine, Medical University of South Carolina, Charleston, SC
| | - Jaysson T Brooks
- Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Scottish Rite for Children, Dallas, TX
| | - Michelle C Welborn
- Department of Orthopaedic Surgery, Shriner's Hospital for Children Portland, Portland, OR
| | - John B Emans
- Department of Orthopedic Surgery, Boston Children's Hospital, Boston, MA
| | - Jason B Anari
- Division of Orthopaedics, Children's Hospital of Philadelphia, Philadelphia
| | - Charles E Johnston
- Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Scottish Rite for Children, Dallas, TX
| | - Behrooz A Akbarnia
- San Diego Spine Foundation, San Diego.,Department of Orthopaedic Surgery, University of California San Diego School of Medicine, La Jolla, CA
| | - Richard McCarthy
- Department of Orthopaedics, University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock, AR
| | - John Flynn
- Division of Orthopaedics, Children's Hospital of Philadelphia, Philadelphia
| | - Jeffrey R Sawyer
- Department of Orthopaedic Surgery, University of Tennessee-Campbell Clinic, Germantown, TN
| | - Michael G Vitale
- Department of Orthopaedic Surgery, Columbia University Irving Medical Center.,Division of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital, Columbia University Irving Medical Center
| | - Benjamin D Roye
- Department of Orthopaedic Surgery, Columbia University Irving Medical Center.,Division of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital, Columbia University Irving Medical Center
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Matsumoto H, Sinha R, Roye BD, Ball JR, Skaggs KF, Brooks JT, Welborn MC, Emans JB, Anari JB, Johnston CE, Akbarnia BA, Vitale MG, Murphy RF. Contraindications to magnetically controlled growing rods: consensus among experts in treating early onset scoliosis. Spine Deform 2022; 10:1289-1297. [PMID: 35780448 DOI: 10.1007/s43390-022-00543-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 06/06/2022] [Indexed: 10/17/2022]
Abstract
PURPOSE The purpose of this study was to describe contraindications to the magnetically controlled growing rod (MCGR) in patients with early onset scoliosis (EOS) by establishing consensus amongst expert surgeons who treat these patients frequently. METHODS Nine pediatric spine surgeons from an international EOS study group participated in semi-structured interviews via email to identify factors that influence decision making in the use of MCGR. A 39-question survey was then developed to specify these factors as contraindications for MCGR-these included patient age and size, etiology, medical comorbidities, coronal and sagittal curve profiles, and skin and soft tissue characteristics. Pediatric spine surgeons from the EOS international study group were invited to complete the survey. A second 29-item survey was created to determine details and clarify results from the first survey. Responses were analyzed for consensus (> 70%), near consensus (60-69%), and no consensus/variability (< 60%) for MCGR contraindication. RESULTS 56 surgeons of 173 invited (32%) completed the first survey, and 64 (37%) completed the second survey. Responders had a mean of over 15 years in practice (range 1-45) with over 6 years of experience with using MCGR (range 2-12). 71.4% of respondents agreed that patient size characteristics should be considered as contraindications, including BMI (81.3%) and spinal height (84.4%), although a specific BMI range or a specific minimum spinal height were not agreed upon. Among surgeons who agreed that skin and soft tissue problems were contraindications (78.6%), insufficient soft tissue (98%) and skin (89%) to cover MCGR were specified. Among surgeons who reported curve stiffness as a contraindication (85.9%), there was agreement that this curve stiffness should be defined by clinical evaluation (78.2%) and by traction films (72.3%). Among surgeons who reported sagittal curve characteristics as contraindications, hyperkyphosis (95.3%) and sagittal curve apex above T3 (70%) were specified. Surgeons who indicated the need for repetitive MRI as a contraindication (79.7%) agreed that image quality (72.9%) and not patient safety (13.6%) was the concern. In the entire cohort, consensus was not achieved on the following factors: patient age (57.4%), medical comorbidities (46.4%), etiology (53.6%), and coronal curve characteristics (58.9%). CONCLUSION Surgeon consensus suggests that MCGR should be avoided in patients who have insufficient spinal height to accommodate the MCGR, have potential skin and soft tissue inadequacy, have too stiff a spinal curve, have too much kyphosis, and require repetitive MRI, particularly of the spine. Future data-driven studies using this framework are warranted to generate more specific criteria (e.g. specific degrees of kyphosis) to facilitate clinical decision making for EOS patients. LEVEL OF EVIDENCE Level V-expert opinion.
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Affiliation(s)
- Hiroko Matsumoto
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA. .,Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, 10032, USA.
| | - Rishi Sinha
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA
| | - Benjamin D Roye
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA.,Division of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY, 10032, USA
| | - Jacob R Ball
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA
| | - Kira F Skaggs
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA
| | - Jaysson T Brooks
- Scottish Rite for Children/UT-Southwestern, Dallas, TX, 75219, USA
| | - Michelle C Welborn
- Department of Orthopaedic Surgery, Shriner's Hospital for Children Portland, Portland, OR, 97229, USA
| | - John B Emans
- Department of Orthopedic Surgery, Boston Children's Hospital, Boston, MA, 02115, USA
| | - Jason B Anari
- Division of Orthopaedics, Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | | | - Behrooz A Akbarnia
- San Diego Spine Foundation, San Diego, CA, 92121, USA.,Department of Orthopaedic Surgery, University of California San Diego School of Medicine, La Jolla, CA, 92093, USA
| | - Michael G Vitale
- Department of Orthopedic Surgery, Columbia University Irving Medical Center, New York, NY, 10032, USA.,Division of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY, 10032, USA
| | - Robert F Murphy
- Department of Orthopaedics, Medical University of South Carolina, Charleston, SC, 29492, USA
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Shaw KA, Welborn MC, Matsumoto H, Parent S, Sachwani N, El-Hawary R, Skaggs D, Newton PO, Blakemore L, Vitale M, Samdani A, Murphy JS. To tether or fuse? Significant equipoise remains in treatment recommendations for idiopathic scoliosis. Spine Deform 2022; 10:763-773. [PMID: 35316524 DOI: 10.1007/s43390-022-00497-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/05/2022] [Indexed: 11/27/2022]
Abstract
PURPOSE Vertebral body tethering (VBT) continues to grow in interest from both a patient and surgeon perspective for the treatment of scoliosis. However, the data are limited when it comes to surgeon selection of both procedure type and instrumented levels. This study sought to assess surgeon variability in treatment recommendation and level selection for VBT versus posterior spinal fusion (PSF) for the management of scoliosis. METHODS Surgeon members of the Pediatric Spine Study Group and Harms Study Group were queried for treatment recommendations and proposed upper instrumented vertebra (UIV) and lower instrumented vertebra (LIV) selection for PSF and VBT based on 17 detailed clinical vignettes. Responses were subdivided in each clinical vignette according to surgeon experience and treatment recommendations with assessment of intra-rater reliability. Binomial distribution tests were used to establish equipoise, selecting p < 0.10 to indicate the presence of a treatment choice with consensus set > 70% agreement. For treatment choice, responses were assessed first for consensus on the decision to proceed with PSF or VBT. RESULTS Thirty-five surgeons with varied experience completed the survey with 26 surgeons (74%) completing the second follow-up survey. Overall, VBT was the recommended treatment by 47% of surgeons, ranging by clinical vignette. Consensus in treatment recommendation was present for 6 clinical vignettes including 3 for VBT and 3 for PSF, with equipoise present for the remaining 11. Of the 17 vignettes, 12 demonstrated moderate intra-observer reliability including the 3 consensus vignettes for VBT. Sanders stage ≤ 3 and smaller curve magnitude were related with VBT recommendation but neither age nor curve flexibility significantly influenced the decision to recommend VBT. Surgeons with high VBT volume, ≥ 11 VBT cases/year, were more likely to recommend VBT than those with low volumes (0-10 cases per year (p < 0.0001)). High VBT volume surgeons demonstrated consensus in VBT recommendation for Lenke 5/6 curves (75% mean recommendation). High VBT volume surgeons had a significantly higher VBT recommendation rate for Lenke 1A, 2A curves (71.8% vs 48.0%, p = 0.012), and Lenke 3 curves (62% vs 26.9%, p = 0.023). Equipoise was present for all vignettes in low volume surgeons. In addition, high VBT volume surgeons trended toward including more instrumented levels than low VBT volume surgeons (7.17 vs 6.69 levels). CONCLUSION Significant equipoise is present among pediatric spine surgeons for treatment recommendations regarding VBT and PSF. Surgeon-, patient-, and curve-specific variables were identified to influence treatment recommendations, including surgeon experience, curve subtype, deformity magnitude, and skeletal maturity. This study highlights the need for continued research in identifying the optimal indications for VBT and PSF in the treatment of pediatric spinal deformity.
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Affiliation(s)
- K Aaron Shaw
- Department of Orthopaedic Surgery, Dwight D. Eisenhower Army Medical Center, Fort Gordon, GA, USA
| | - Michelle C Welborn
- Department of Spine Surgery, Shriners Hospital for Children Portland, Portland, OR, USA
| | - Hiroko Matsumoto
- Department of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital of New York, New York, NY, USA
| | - Stefan Parent
- Department of Orthopaedic Surgery, Hospital Ste-Justine (HSJ), Montreal, QC, Canada
| | - Numera Sachwani
- Department of Pediatric Orthopaedic Surgery, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Ron El-Hawary
- Department of Orthopaedic Surgery, IWK Health Centre, Halifax, NS, Canada
| | - David Skaggs
- Department of Orthopaedics, Cedars-Sinai, Los Angeles, CA, USA
| | - Peter O Newton
- Department of Pediatric Orthopaedic Surgery, Rady Children's Hospital, San Diego, CA, USA
| | - Laurel Blakemore
- Department of Pediatric Orthopaedic Surgery, Pediatric Specialists of Virginia, Merrifield, VA, USA
| | - Michael Vitale
- Department of Pediatric Orthopaedic Surgery, New York-Presbyterian Morgan Stanley Children's Hospital of New York, New York, NY, USA
| | - Amer Samdani
- Department of Neurosurgery, Shriners Hospital-Philadelphia, Philadelphia, PA, USA
| | - Joshua S Murphy
- Department of Pediatric Orthopaedic Surgery, Children's Healthcare of Atlanta, Atlanta, GA, USA.
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Roye BD, Fields MW, Matsumoto H, Sponseller P, Pérez-Grueso FJS, Boachie-Adjei O, Hammerberg K, Welborn MC, Vitale MG. The Association Between the Utilization of Traction and Postoperative Complications Following Growing Rod Instrumentation for Early-onset Scoliosis. J Pediatr Orthop 2020; 40:e798-e804. [PMID: 32658160 DOI: 10.1097/bpo.0000000000001628] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Preoperative and/or intraoperative traction have been proposed as adjunctive methods to limit complications associated with growth-friendly instrumentation for early-onset scoliosis (EOS). By gradually correcting the deformity before instrumentation, traction can, theoretically, allow for better overall correction without the complications associated with the immediate intraoperative correction. The purpose of this multicenter study was to investigate the association between preoperative/intraoperative traction and complications following growth-friendly instrumentation for EOS. METHODS Patients with EOS who underwent growth rod instrumentation before 2017 were identified from 2 registries. Patients were divided into 2 groups: preoperative traction group versus no preoperative traction group. A subgroup analysis was done to compare intraoperative traction only versus no traction. Data was collected on any postoperative complication from implantation to up to 2 years postimplantation. RESULTS Of 381 patients identified, 57 (15%) and 69 (18%) patients received preoperative and intraoperative traction, respectively. After adjusting for etiology and degree of kyphosis, there was no evidence to suggest that preoperative halo traction reduced the risk of any complication following surgical intervention. Although not statistically significant, a subgroup analysis of patients with severe curves demonstrated a trend toward a markedly reduced hardware failure rate in patients undergoing preoperative halo traction [preoperative traction: 1 (3.1%) vs. no preoperative traction: 11 (14.7%), P=0.083]. Nonidiopathic, hyperkyphotic patients treated with intraoperative traction were 61% less likely to experience any postoperative complication (P=0.067) and were 74% (P=0.091) less likely to experience an unplanned return to the operating room when compared with patients treated without traction. CONCLUSIONS This multicenter study with a large sample size provides the best evidence to date of the association between the use of traction and postoperative complications. Our results justify the need for future Level I studies aimed at characterizing the complete benefit and risk profile for the use of traction in surgical intervention for EOS. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
| | | | | | - Paul Sponseller
- Department of Orthopedic Surgery, The Johns Hopkins University, Baltimore, MD
| | | | | | - Kim Hammerberg
- Motion Analysis Laboratory, Shriners Hospitals for Children, Chicago, IL
| | - Michelle C Welborn
- Department of Orthopaedic Surgery, Shriner's Hospital for Children Portland, Portland, OR
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