Publications (4)6.51 Total impact
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Article: Intraarticular abnormalities in overhead athletes are variable.
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ABSTRACT: The cause of shoulder pain and dysfunction in the overhead athlete can be variable. Several studies illustrate the wide variety of lesions seen at the time of arthroscopy in overhead athletes who require surgery but it is unclear whether these differ by sport. We examined overhead athletes with shoulder dysfunction to determine (1) the range of arthroscopically visualized shoulder abnormalities with specific attention to the posterosuperior glenohumeral joint and the rotator cuff; and (2) the relationship of sport type to these abnormalities. We reviewed our institution's database for professional and collegiate athletes in overhead sports who, from 1996 through 2010, had diagnostic shoulder arthroscopy for insidious, nontraumatic, persistent pain and inability to participate in their sport. A descriptive analysis of the arthroscopic findings from 51 consecutive patients (33 males, 18 females; mean age, 25 years; range, 15-59 years) was done. We analyzed the arthroscopic findings with respect to sport using analysis of variance and Fisher's exact test. There was a wide range of superior labrum, posterosuperior glenoid, and rotator cuff abnormalities. Overall, the most frequent abnormalities were posterosuperior glenohumeral joint changes. Swimmers had fewer intraarticular abnormalities than baseball players. We found a wide spectrum of intraarticular abnormalities in the shoulder of overhead athletes with shoulder pain requiring surgery. Additional study is needed to determine whether these abnormalities or combinations relate to specific athletic movements. Level IV, retrospective case series. See Guidelines for Authors for a complete description of levels of evidence.Clinical Orthopaedics and Related Research 11/2011; 470(6):1552-7. · 2.53 Impact Factor -
Article: An injectable method for noninvasive spine fusion.
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ABSTRACT: Bone morphogenetic proteins (BMPs) induce bone formation but are difficult to localize, and subsequent diffusion from the site of interest and short half-life reduce the efficacy of the protein. Currently, spine fusion requires stripping, decortications of the transverse processes, and an autograft harvest procedure. Even in combination with BMPs, clinical spinal fusion has a high failure rate, presumably because of difficulties in localizing sufficient levels of BMP. The goal was to achieve reliable spine fusion through a single injection of a cell-based gene therapy system without the need for any surgical intervention. Eighty-seven immunodeficient (n=44) and immune-competent (n=43) mice were injected along the paraspinous musculature to achieve rapid induction of heterotopic ossification (HO) and ultimately spinal arthrodesis. Immunodeficient and immune-competent mice were injected with fibroblasts, transduced with an adenoviral vector to express BMP2, along the paraspinous musculature. Bone formation was evaluated via radiographs, microcomputed tomography, and biomechanical analysis. ew bridging bone between the vertebrae and the fusion to adjacent skeletal bone was obtained as early as 2 weeks. Reduction in spine flexion-extension also occurred as early as 2 weeks after injection of the gene therapy system, with greater than 90% fusion by 4 weeks in all animals regardless of their genetic background. Injection of our cell-based system into the paraspinous musculature induces spinal fusion that is dependent neither on the cell type nor on the immune status. These studies are the first to harness HO in an immune-competent model as a noninvasive injectable system for clinically relevant spinal fusion and may one day impact human spinal arthrodesis.The spine journal: official journal of the North American Spine Society 02/2011; 11(6):545-56. · 2.90 Impact Factor -
Article: Assessing mechanical integrity of spinal fusion by in situ endochondral osteoinduction in the murine model.
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ABSTRACT: Historically, radiographs, micro-computed tomography (micro-CT) exams, palpation and histology have been used to assess fusions in a mouse spine. The objective of this study was to develop a faster, cheaper, reproducible test to directly quantify the mechanical integrity of spinal fusions in mice. Fusions were induced in ten mice spine using a previously described technique of in situ endochondral ossification, harvested with soft tissue, and cast in radiolucent alginate material for handling. Using a validated software package and a customized mechanical apparatus that flexed and extended the spinal column, the amount of intervertebral motion between adjacent vertebral discs was determined with static flexed and extended lateral spine radiographs. Micro-CT images of the same were also blindly reviewed for fusion. Mean intervertebral motion between control, non-fused, spinal vertebral discs was 6.1 +/- 0.2 degrees during spine flexion/extension. In fusion samples, adjacent vertebrae with less than 3.5 degrees intervertebral motion had fusions documented by micro-CT inspection. Measuring the amount of intervertebral rotation between vertebrae during spine flexion/extension is a relatively simple, cheap (<$100), clinically relevant, and fast test for assessing the mechanical success of spinal fusion in mice that compared favorably to the standard, micro-CT.Journal of Orthopaedic Surgery and Research 01/2010; 5:58. -
Article: Allopurinol-induced DRESS syndrome in an adolescent patient.
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ABSTRACT: A 16-year-old male patient, with a history of essential hypertension enrolled in an experimental drug protocol using allopurinol, presented to our emergency department with a 10-day history of fever. Initial laboratory evaluation revealed leukocytosis, eosinophilia, and transaminitis. After extensive work-up and exclusion of infectious and oncologic etiologies, the diagnosis of allopurinol-induced drug reaction and eosinophilia with systemic symptoms syndrome was carried out. The patient responded to administration of IV methylprednisolone, with complete resolution of symptoms and improvement of laboratory abnormalities. This case represents the first report of allopurinol-induced drug reaction and eosinophilia with systemic symptoms syndrome in a pediatric patient.Pediatric Dermatology 10/2009; 27(3):270-3. · 1.07 Impact Factor
Top co-authors
Top Journals
Institutions
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2011
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Johns Hopkins University
- Department of Orthopaedic Surgery
Baltimore, MD, USA
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2009–2010
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Baylor College of Medicine
- Department of Pediatrics
Houston, TX, USA
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