Research Topics
| Tony S KellerSummaryAffiliation: University of Vermont Country: USA Publications
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Detail Information
Publications
Prediction of osteoporotic spinal deformityTony S Keller
Department of Mechanical Engineering, University of Vermont, Burlington, Vermont 05405 0156, USA
Spine (Phila Pa 1976) 28:455-62. 2003..A biomechanical model was developed from full-spine lateral radiographs to predict osteoporotic spinal deformity in elderly subjects...- In vivo transient vibration assessment of the normal human thoracolumbar spineT S Keller
Department of Mechanical Engineering, University of Vermont, Burlington, VT 05405, USA
J Manipulative Physiol Ther 23:521-30. 2000..The objective of this study was to quantify the mobility characteristics (dynamic stiffness and mechanical impedance) of the normal human thoracolumbar spine with a transient vibration analysis technique... - Influence of spine morphology on intervertebral disc loads and stresses in asymptomatic adults: implications for the ideal spineTony S Keller
Department of Mechanical Engineering, University of Vermont, 33 Cochester Avenue, Burlington, VT 05405 0156, USA
Spine J 5:297-309. 2005..Sagittal profiles of the spine have been hypothesized to influence spinal coupling and loads on spinal tissues... - Force-deformation response of the lumbar spine: a sagittal plane model of posteroanterior manipulation and mobilizationTony S Keller
Department of Mechanical Engineering, University of Vermont, 119C Votey Building, Burlington VT 05405 0156, USA
Clin Biomech (Bristol, Avon) 17:185-96. 2002..To develop a mathematical model capable of describing the static and dynamic motion response of the lumbar spine to posteroanterior forces... - A prospective study on CT scan outcomes after conservative decompression surgery for lumbar spinal stenosisR Gunzburg
Centennial Clinic, Antwerp, Belgium
J Spinal Disord Tech 16:261-7. 2003..The CT scan canal measures used in this study cannot be advocated for evaluation of outcome in conservative lumbar spinal canal decompression... - Vertebroplasty and kyphoplasty affect vertebral motion segment stiffness and stress distributions: a microstructural finite-element studyTony S Keller
Department of Mechanical Engineering, University of Vermont, Burlington 05405 0156, USA
Spine (Phila Pa 1976) 30:1258-65. 2005..The mechanical behavior of a thoracic motion segment following cement augmentation was studied using the finite-element method... - Assessment of trunk function in single and multi-level spinal stenosis: a prospective clinical trialTony S Keller
Department of Mechanical Engineering, University of Vermont, 201 Votey Building, Burlington, VT 05405 0156, USA
Clin Biomech (Bristol, Avon) 18:173-81. 2003..To clarify the biomechanical indicators of single- and multi-level stenosis and to determine the biomechanical outcome of selective conservative decompression... - A rigid body model of the dynamic posteroanterior motion response of the human lumbar spineTony S Keller
Department of Mechanical Engineering, University of Vermont, Burlington, VT 05405, USA
J Manipulative Physiol Ther 25:485-96. 2002.... - Neuromechanical characterization of in vivo lumbar spinal manipulation. Part I. Vertebral motionTony S Keller
Department of Mechanical Engineering, University of Vermont, Burlington, USA
J Manipulative Physiol Ther 26:567-78. 2003..Our findings demonstrate that PA, ML, and AX spinal motions are coupled and dependent on applied force and contact point... - Finite element modeling of trabecular bone damageVictor Kosmopoulos
Department of Mechanical Engineering, University of Vermont, Burlington, VT 05405-0156, USA
Comput Methods Biomech Biomed Engin 6:209-16. 2003..The iterative computational approach presented provides a methodology to study trabecular bone damage, and should provide researchers with a computational approach to study bone fracture and repair and to predict vertebral fragility... - Posture-dependent isometric trunk extension and flexion strength in normal male and female subjectsTony S Keller
Musculoskeletal Research Laboratory, Department of Mechanical Engineering, University of Vermont, Burlington, Vermont 05405-0156, USA
J Spinal Disord Tech 15:312-8. 2002..The baseline trunk isometric strength data provided by this study should help clinicians to use strength testing more precisely and specifically in prevention and diagnosis of patients at risk for back disorders... - Dynamic dorsoventral stiffness assessment of the ovine lumbar spineTony S Keller
Department of Mechanical Engineering, University of Vermont, 119C Votey Building, Burlington, VT 05405 0156, USA
J Biomech 40:191-7. 2007..The results indicate that changes in mechanical excitation frequency and animal body mass modulate DV spinal stiffness... - Three-dimensional vertebral motions produced by mechanical force spinal manipulationTony S Keller
Musculoskeletal Research Foundation, Florida Orthopaedic Institute, Temple Terrace, Fla, USA
J Manipulative Physiol Ther 29:425-36. 2006..The aim of this study was to quantify and compare the 3-dimensional intersegmental motion responses produced by 3 commonly used chiropractic adjusting instruments... - An infrared system for monitoring Drosophila motility during microgravityMark S Miller
Department of Mechanical Engineering, University of Vermont, Burlington, VT 05405, USA
J Gravit Physiol 9:83-91. 2002..DIMMS is also lightweight, compact, and power efficient. DIMMS has been flight tested onboard NASA's KC-135 reduced gravity research aircraft and a Nike-Orion sounding rocket... - Posture-dependent trunk extensor EMG activity during maximum isometrics exertions in normal male and female subjectsA L Roy
University of Vermont, Department of Mechanical Engineering, 33 Colchester Avenue, 119 Votey Building, Burlington, VT 05405-0156, USA
J Electromyogr Kinesiol 13:469-76. 2003..Our findings indicate that appropriate postural normalization of trunk extensor EMG activity is necessary for studies where submaximal trunk exertions are performed over a range of upright postures... - Electromyographic analysis of a human powered stepper cycle during seated and standing ridingM S Miller
Mechanical Engineering Department, University of Vermont, Burlington, VT 05405, USA
J Electromyogr Kinesiol 11:413-23. 2001..Individuals able to perform vastis lateralis and medialis intensive activities, such as the concentric portion of a squat or using a stepping machine (Stair Master), should be able to comfortably ride the Step 'n Go at low power levels... - Mechanical properties of open-cell foam synthetic thoracic vertebraeAmy E Johnson
Department of Mechanical Engineering, The University of Vermont, Burlington, VT, USA
J Mater Sci Mater Med 19:1317-23. 2008..Synthetic open-cell foam vertebrae offer researchers an alternative to human vertebral bone for static and dynamic biomechanical experiments, including studies examining the effects of cement injection... - A biomechanical model of the lumbar spine during upright isometric flexion, extension, and lateral bendingD C Guzik
Department of Mechanical Engineering, University of Vermont, Burlington, USA
Spine (Phila Pa 1976) 21:427-33. 1996..Vertebral strength estimates based upon vertebral density appear to be useful for validation of model force predictions... - Clinical and psychofunctional measures of conservative decompression surgery for lumbar spinal stenosis: a prospective cohort studyR Gunzburg
Centennial Clinic, Antwerp, Belgium
Eur Spine J 12:197-204. 2003..Our findings indicate that, even in a highly organic disorder such as spinal stenosis, illness behavior plays an important role in predicting surgical outcome... - Predicting trabecular bone microdamage initiation and accumulation using a non-linear perfect damage modelVictor Kosmopoulos
Hopital Orthopedique de la Suisse Romande, Avenue Pierre Decker 4, CH 1005 Lausanne, Switzerland
Med Eng Phys 30:725-32. 2008..The model introduced in this paper establishes a history of microdamage evolution in both the pre- and post-yield regions... - Intervertebral disc degeneration reduces vertebral motion responsesChristopher J Colloca
Department of Kinesiology, Biomechanics Laboratory, Exercise and Sport Science Research Institute, Arizona State University, Tempe, AZ, USA
Spine (Phila Pa 1976) 32:E544-50. 2007..A prospective in vivo experimental animal study... - Center of rotation affects abduction range of motion of reverse shoulder arthroplastySergio Gutiérrez
Musculoskeletal Research Foundation, Florida Orthopaedic Institute, Temple Terrace, FL 33637, USA
Clin Orthop Relat Res 458:78-82. 2007..Superiorly, abduction was limited by impingement on the acromion. A positive linear correlation was found between abduction range of motion and center of rotation offset relative to the glenoid... - Spinal manipulation reduces pain and hyperalgesia after lumbar intervertebral foramen inflammation in the ratChristopher J Colloca
J Manipulative Physiol Ther 30:76; author reply 77. 2007 - Modeling the onset and propagation of trabecular bone microdamage during low-cycle fatigueVictor Kosmopoulos
Hopital Orthopedique de la Suisse Romande, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
J Biomech 41:515-22. 2008..Furthermore, the model is consistent with previous numerical fatigue simulations indicating that microdamage to a small number of trabeculae results in relatively large specimen modulus reductions and rapid failure... - Hierarchy of stability factors in reverse shoulder arthroplastySergio Gutiérrez
University of South Florida, College of Engineering, Chemical and Biomedical Engineering, Tampa, FL 33637, USA
Clin Orthop Relat Res 466:670-6. 2008..Similar results were predicted by a mathematical model, suggesting the stability was determined primarily by compressive forces generated by muscles... - Muscular contributions to dynamic dorsoventral lumbar spine stiffnessTony S Keller
Florida Orthopaedic Institute, 13020 North Telecom Parkway, Temple Terrace, FL, USA
Eur Spine J 16:245-54. 2007..These results indicate that the dynamic mechanical behavior of the ovine spine is modulated by muscle stimulation, and suggests that muscle contraction plays an important role in stabilizing the lumbar spine... - Spinal manipulation force and duration affect vertebral movement and neuromuscular responsesChristopher J Colloca
Biomechanics Laboratory, Exercise and Sport Research Institute, Department of Kinesiology, Arizona State University, Tempe, AZ, USA
Clin Biomech (Bristol, Avon) 21:254-62. 2006..Previous study in human subjects has documented biomechanical and neurophysiological responses to impulsive spinal manipulative thrusts, but very little is known about the neuromechanical effects of varying thrust force-time profiles... - Comparison of dynamic posteroanterior spinal stiffness to plain film radiographic images of lumbar disk heightChristopher J Colloca
New York Chiropractic College, Seneca Falls, NY, USA
J Manipulative Physiol Ther 26:233-41. 2003.... - Neuromechanical characterization of in vivo lumbar spinal manipulation. Part II. Neurophysiological responseChristopher J Colloca
State of the Art Chiropractic Center, Pheonix, AZ, USA
J Manipulative Physiol Ther 26:579-91. 2003..These findings suggest that intersegmental motions produced by spinal manipulation may play a prominent role in eliciting physiologic responses... - Biomechanical and neurophysiological responses to spinal manipulation in patients with lumbar radiculopathyChristopher J Colloca
State of the Art Chiropractic Center, Phoenix, AZ 85044, USA
J Manipulative Physiol Ther 27:1-15. 2004..The purpose of this study was to quantify in vivo vertebral motions and neurophysiological responses during spinal manipulation... - Active trunk extensor contributions to dynamic posteroanterior lumbar spinal stiffnessChristopher J Colloca
Department of Kinesiology, Atizona State University, Tempe, AZ, USA
J Manipulative Physiol Ther 27:229-37. 2004.... - Anterior thoracic posture increases thoracolumbar disc loadingDeed E Harrison
Ruby Mountain Chiropractic Center, 123 Second Street, Elko, NV, 89801, USA
Eur Spine J 14:234-42. 2005..In conclusion, anterior trunk translation in the standing subject increases extensor muscle activity and loads and stresses acting on the intervertebral disc in the lower thoracic and lumbar regions... - Comparison of mechanical force of manually assisted chiropractic adjusting instrumentsChristopher J Colloca
Neuromechanical Innovations, L L C, USA
J Manipulative Physiol Ther 28:414-22. 2005..To quantify the force-time and force-delivery characteristics of six commonly used handheld chiropractic adjusting devices... - Prevention of hip lag screw cut-out by cement augmentation: description of a new technique and preliminary clinical resultsMarek Szpalski
Centre Hospitalier Moliere Longchamp, 21 avenue Coghen, B 1180 Brussels, Belgium
J Orthop Trauma 18:34-40. 2004..Potentially, this bis-GMA-based composite may reduce the frequency of cut-out complications by enhancing bone-implant interface... - Hydraulic strengthening affects the stiffness and strength of cortical boneMichael A K Liebschner
Department of Bioengineering, Rice University, Houston, TX 77005, USA
Ann Biomed Eng 33:26-38. 2005..A generalized power law model is proposed to account for the fact that HS in cortical bone exhibits an upper and lower asymptotic bound and is bi-modal in terms of strain-rate... - Evaluation of abduction range of motion and avoidance of inferior scapular impingement in a reverse shoulder modelSergio Gutiérrez
Florida Orthopaedic Institute Research Foundation, Temple Terrace, FL 33637, USA
J Shoulder Elbow Surg 17:608-15. 2008..Neck-shaft angle had the largest effect on inferior scapular impingement, followed by glenosphere position. This information may be useful to the surgeon when deciding on the appropriate reverse implant...