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Department of Orthopedics

Department of Orthopedics
 

Biomechanics Lab

Modeling, Testing, Fabrication, Evaluation


Baldini
Todd Baldini, MSc

Lab Manager - Todd Baldini, MSc

Located at the Anschutz Medical Campus of the University of Colorado - Denver, the Biomechanics Lab represents a facility unique in the Rocky Mountain Region. The state-of-the-art lab encompasses biomechanical testing, device fabrication and evaluation, surgical simulation, and computer modeling. The lab performs research in all areas of orthopaedic biomechanics. Additionally, strong collaborations exist between the Biomechanics Lab and other academic institutions (Colorado School of Mines, Colorado State University, University of Colorado – Boulder), and health care facilities (Children’s Hospital – Colorado, Denver Health).​​

Facilities

5,740 Sq. Ft. mixed laboratory, machine shop, and freezer space
2,200 Sq. Ft. mixed office and meeting space

Equipment

Custom Equipment
6-degree-of-freedom servo-pneumatic joint/spine simulator system

Laboratory Equipment
Instron Model #1321 Biaxial, hydraulically actuated load frame with Model 8500 Linear/Rotary Controller
Tekscan Dynamic Pressure Measurement System
MaxTRAQ 3D Motion Analysis System with two Sentech Cameras
Polariscope (for photoelastic stress and strain measurement)
Thin section saws (2)
Biro Butchers Bandsaw
Pentax Digital SLR camera

Surgical Equipment
Medtronic and Stryker Surgical Navigation Systems
Stryker Endoscopy Systems (2)
Stryker 2102 Drill
Stryker 2104 Reamer
Stryker 2106 Recip Saw
Stryker 2108 Sag Saw

Machine Shop
Bridgeport CNC Mill
Taig Desktop CNC Milling Machine
Lagun Mill
Hardinge Lathe
Sheldon Lathe
Taig Desktop Lathe
Drill press
Band Saws (2)
Famco Press
Grinder
Buffer
Delta Belt Sander 

Research projects include:

  • Evaluation of new hardware and surgical instruments to repair rotator cuff tears in cadaver models
  • Comparison of fracture fixation hardware in cadaver and Sawbones® models
  • Optimal repair of ACL injuries
  • Location of optimum flexion-extension axis in the human knee
  • Facet joint forces, pressures, and spine kinematics as a function of intervertebral disc injury and spinal instrumentation
  • Validation and assessment of surgical navigation systems
  • Comparison of standard vs. computer navigated techniques in minimally invasive total hip replacement
  • Evaluation of total knee replacement implants and ability to restore normal kinematics
  • Facet joint pressures as a function of spinal instrumentation
  • Computer assisted surgical planning

Graduate Students

Kelly Desens, M.S. (2008)
Engineering Systems, Colorado School of Mines
Thesis: In Vivo Prediction of Modular Component Sizing, Orientation, and Range of Motion, for Total Hip Arthroplasty

Anthony J. Babb, M.S. (2007)
Engineering Systems, Colorado School of Mines
Thesis; A Comparative Study of the Anteroposterior, Cylindrical, Posterior Condylar, and Transepicondylar Axes for Femoral Implant Positioning in Total Knee Arthroplasty

Sara L. Lewandowski, M.S. (2007)
Engineering Systems, Colorado School of Mines
Thesis; Development of a Pelvic Reference Frame for Image-Guided Computer-Assisted Total Hip Arthroplasty

Tara N. Holz, M.S. (2007)
Engineering Systems, Colorado School of Mines
Thesis; The Extensor Mechanism, Patellofermoral Contact Mechanics, and Kinematics of the Knee in Four Conditions; Healty, ACL Deficient, Implanted PCL Sparing and Sacrificing.

Katherine Peeke, M.S. (2007)
Engineering Systems, Colorado School of Mines
Thesis; Study of Alignment in Total Knee Arthroplasty Around a Single Flexion Axis Evaluated for Helical and Conical Axes

Heather E. Hoops, M.S. (2007)
Engineering Systems, Colorado School of Mines
Thesis; The Neruomuscular Response of the Lumbar Spine to Varying Rest Durations Between Cyclic Flexion Periods

Kerry Jones, M.S. (2006)
Engineering Systems, Colorado School of Mines
Thesis; Development of a Soft Tissue Analog for Use in Cadaveric Knee Brace Testing

Eric T. Hansen, M.S. (2004)
Engineering Systems, Colorado School of Mines, w/Prof. Shoureshi
Thesis; Development, Calibration, and Evaluation of a Telemetric Transducer for Patellofemoral Force Measurement in a Human Knee


Medical Students

Lisa Hamilton (2012/13) w/Dr. Burger

Cameron Barton (2012/13) w/Dr. Burger

Byron Ellis (2011) w/Dr. E. McCarty

Dana Rioux-Forker w/Dr. A. Vidal & Dr. E. McCarty

Shane Cook w/Dr. E. McCarty

Elise Hiza w/Dr. E. McCarty

John Henry Carlson w/Dr. S. Morgan & Dr. R. Koonce

Mark Winston w/Dr. D. Eckhoff

Clifton Hancock w/Dr. D. Eckhoff

Bradley Gustave w/Dr. D. Eckhoff

Shilo Gilbert w/Dr. D. Eckhoff

Craig Hogan w/Dr. D. Eckhoff

Ramin Alizadeh w/Dr. D. Eckhoff

Sean Geraghty w/Dr. D. Eckhoff

Josh Brauer w/Dr. D. Eckhoff

David Sloss w/Dr. D. Eckhoff

Cody Hartshorn w/Dr. D. Eckhoff

Edwin Bacz w/Dr. D. Eckhoff

Laura DiMatteo w/Dr. D. Eckhoff

Brian Tompkins w/Dr. D. Eckhoff


Undergraduate Students

Gabriel Peacher, B.S., Spanish, Trinity College

Kaydence Cowley, B.S., Engineering, Lafayette College

David Grabski, B.S., Engineering Physics, Colorado School of Mines

Kelly Desens, B.S., Engineering, Colorado School of Mines       

Kyle Smith, B.S., Engineering, Colorado School of Mines

Tara Doucette, B.S., Kinesiology, CU Boulder, w/Dr. Eckhoff

Kim Huelson, B.S., Mathematical and Computer Sciences, CSM

Laura Borgstede, B.S., Mechanical Engineering, Colorado State University

Luke Stumme, B.S., Engineering, Colorado School of Mines

Vanessa Ruedebusch, B.S., Mechanical Engineering, Denver University

Timothy Nicklas, B.S., Mechanical Engineering, CU Boulder

Sean Douherty, B.S., Mechanical Engineering, CU Boulder

Jennifer Cech, B.S., Mechanical Engineering, CU Boulder​​

Fellows

Jeffrey Brunelli, MD, (2011-2012) w/Dr. E. McCarty
Kevin Caperton, MD, (2011-2012) w/Dr. E. McCarty
Lucas Rylander, MD (2010-2011) w/Dr. E. McCarty
Jennifer Fitzpatrick, MD, w(2010-211) w/Dr. E. McCarty
Alfred Mansour, MD, (2010-2011) w/Dr. G. Georgopoulos (Children's Hospital Colorado)
James Barsi, MD, (2010-2011) w/Dr. G. Georgopoulos (Children's Hospital Colorado)
Shaun Traub, MD, w/Dr. E. McCarty
Chad Efird, MD, w/Dr. E. McCarty
Kevin McGee, MD, w/Dr. E. McCarty
Jason Oliviero, MD, w/Dr. E. McCarty
Kevin Honig, MD, w/Dr. E. McCarty
Brett Gibson, MD, w/Dr. E. McCarty
Brian Kerr, MD, w/Dr. E. McCarty
Dave Rabalais, MD, w/Dr. E. McCarty
KG Swan, MD, w/Dr. E. McCarty
Lance Snyder, MD, w/Dr. E. McCarty
Kazayoshi Gamada, PhD, (2003 – 2005)

Orthopaedic Residents

George Chaus, MD, (2011-2012) w/Dr. Hammerberg (Denver Health)
Adam Seidl, MD, (2011-2012) w/Dr. A. Vidal (Childern's Hospital Colorado)
Michal Taylor, MD, w/Dr. A. Vidal
Jon Bravman, MD, w/Dr. A. Vidal
Ryan Koonce, MD, w/Dr. S. Morgan
Hector Mejia, MD, w/Dr. M. Dayton
Laura DiMatteo, MD, w/Dr. S. Morgan
Roger Murkin, MD, w/Dr. S. Morgan
Monica Alberts, MD, w/Dr. S. Morgan
Kareem Sobky, MD, w/Dr. J. Wolf
Mike Repine, MD, w/Dr. S. Morgan​​​

Peer Reviewed Manuscripts

Correlation of Vertebral Strength Topography with 3-Dimensional Computed Tomography Structure.
Noshchenko A, Plaseied A, Patel VV, Burger E, Baldini T, Yun L.
Spine (Phila Pa 1976). 2012 Aug 3.

Are conventional reconstruction plates equivalent to precontoured locking plates for distal humerus fracture fixation? A biomechanics cadaver study.
Koonce RC, Baldini TH, Morgan SJ.
Clin Biomech (Bristol, Avon). 2012 Aug;27(7):697-701.

A biomechanical study on the effects of rib head release on thoracic spinal motion.
Yao X, Blount TJ, Suzuki N, Brown LK, van der Walt CJ, Baldini T, Lindley EM, Patel VV, Burger EL.
Eur Spine J. 2012 Apr;21(4):606-12.

Evaluation of spinal instrumentation rod bending characteristics for in-situ contouring.
Noshchenko A, Xianfeng Y, Armour GA, Baldini T, Patel VV, Ayers R, Burger E.
J Biomed Mater Res B Appl Biomater. 2011 Jul;98(1):192-200.

Nucleus Replacement Device Failure: A Case Report and Biomechanical Study.
Lindley EM, Jaafar S, Noshchenko A, Baldini T, Nair DP, Shandas R, Burger EL, Patel VV.
Spine (Phila Pa 1976). 2010 Oct 15;35(22):E1241-7

Thermomechanical Effects of Spine Surgery Rods Composed of Different Metals and Alloys.
Spine (Phila Pa 1976). 2010 Aug 25.

Facet Joint Biomechanics at the Treated and Adjacent Levels after Total Disk Replacement
Botolin, S.; Puttlitz, C.; Baldini, T.; Petrella, A.; Burger, E.; Abjornson, C.; Patel, V.

Spine (Phila Pa 1976). 2011 Jan 1;36(1):E27-32

Lindeque B, Baldini T, “A Biomechanical Comparison of Three Different Lateral Tibia Locking Plates.” Orthopedics. 2010 Jan 1;33(1):18-21

Baldini, T; Snyder, R; McCarty, E, Peacher, G; Bach, J, “Strength of Single vs Double Anchor Repair of Type II SLAP Lesions: A Cadaver Study.  Arthroscopy: The Journal of Arthroscopic and Related Surgery, 2009 Nov;25(11):1257-60

Swan, K; McCarty, E; Baldini, T,  Arthroscopic Suture Material and Knot Type: An Updated Biomechanical Analysis.”  The American Journal of Sports Medicine, (37) 1578-1585, August 2009

Sobky K, Baldini T, Thomas K, Bach J, Williams A, Wolf JM, “Biomechanical Comparison of Different Volar Fracture Fixation Plates for Distal Radius Fractures.”  Hand, 2008 Jun;3(2):96-101. Epub 2007 Sep 7

Eckhoff, D; Hogan, C; DiMatteo, L.; Robinson, M; Bach, J; Difference Between the Epicondylar and Cylindrical Axis of the Knee; Clinical Orthopaedics and Related Research, Vol 461, 2007, pp 238-244.

Robinson, M; Eckhoff, DG; Reinig, KD; Bagur, MM; Bach, JM; Variability of Landmark Identification in Total Knee Arthroplasty; . Clinical Orthopaedics and Related Research, Vol 442, 2006, pp 57-62.

Eilert, RE, Hill, K; Bach, J. "Greater Trochanteric Transfer for the Treatment of Coxa Brevis." Clinical Orthopaedics and Related Research, Vol 434, 2005, pp 92-101.

Eckhoff, DG; Bach, JM; Spitzer, VM; Reinig, KD; Bagur, MM; Baldini, TH; Flannery; NMP."Three-Dimensional Mechanics, Kinematics, and Morphology of the Knee Viewed in Virtual Reality." J. Bone Joint Surg. Am., Dec 2005, 87, pp. 71 - 80.

DiGioia, AM; Mor, AB; Jaramaz, B; Bach, JM; Accuracy and Validation for Surgical Navigation Systems.  American Academy of Orthopaedic Surgeons, American Association of Orthopaedic Surgeons, Bulletin, Vol 53, No 5, Oct 2005, 10-13.

Alizadeh RI, Eckhoff DG, Samson MM, Doucette TK, Hogan CA, Bach JM. "Axial and Rotational Alignment of the Leg." Biomed Sci Instrum, Vol. 40, 2004, pp.290-6.

Erickson, M.; Oliver, T.; Baldini, T.; Bach, J.M. "Biomechanical Assessment of Conventional Unit Rod Fixation Versus a Unit Rod Pedicle Screw Construct: A Human Cadaver Study." Spine, Vol 29, No. 12, 2004, pp 1314-1319.

Eckhoff, D.G.; Bach, J.M.; Spitzer, V.M.; Reinig, K.D.; Bagur, M.; Baldini, T; Rubenstein, D; Humphries, S. "3-D Morphology and Kinematics of the Distal Femur Viewed in Virtual Reality: Part II." Journal of Bone and Joint Surgery, Vol. 85-A, Supplement 4, 2003, pp. 97-104.

Eckhoff, D.G.; Dwyer, T.F.; Bach, J.M.; Spitzer, V.M.; Reining, K.D. "Three-Dimensional Morphology of the Distal Part of the Femur Viewed in Virtual Reality." Journal of Bone and Joint Surgery, Vol. 83-A, Supplement 2, Part I, 2001, pp. 43-50.

Bach, JM; Hull, ML. "Strain of the Anterior Cruciate Ligament Increases Linearly with Quadriceps Contraction." Skiing Trauma and Safety: Twelfth Volume, AS​TM STP 1345, R. Johnson, Ed., American Society for Testing and Materials, West Conshohocken, PA, 1999, pp. 94-104.

Peer Reviewed Abstracts

Pediatric Orthopaedic Society of North America’s (POSNA) Annual Meeting, 2012
Biomechanics of Two Physeal-Sparing ACL Reconstruction Techniques: A Cadaver Study
Sarah Sibbel, MD; Alfred Mansour, MD; Todd Baldini, MS; Pam Wolfe, MS; Michelle Wolcott, MD; Armando Vidal, MD

Pediatric Orthopaedic Society of North America’s (POSNA) Annual Meeting, 2012
Biomechanical comparison of augmented distal fixation of Fassier-Duval telescoping rods
Alfred Mansour, MD; James Barsi, MD; Todd Baldini, MS; Gaia Georgopoulos, MD

American Orthopaedic Society of Sports Medicine’s (AOSSM) Annual Meeting, 2012
Biomechanical Analysis of Femoral Suspensory Fixation Devices: A Practical Comparison
Jeffrey Brunelli, MD; Todd Baldini, MS; Lucas Rylander, MD; Byron Ellis, BS; Michal Taylor, MD; Monica Hawkins, PhD; Eric McCarty, MD

Western Orthopaedic Association Annual Meeting, 2010
Distal Humerus Fracture Fixation – Are Precontoured Locking Plates Biomechanically Superior to Conventional Reconstruction Plates?
Sanford and Darlene Anzel Award winner Koonce, R.; Baldini, T.; Carson, J.H.; Morgan, S.

Orthopaedic Research Society’s Annual Meeting, 2010

Patellofemoral Joint Contact Area During Quadriceps Loading in Intact, ACL Deficient and Implanted Knees
Holz, T.N.; Baldini, T.H.; Dayton, M.; Bach, J.M.

Orthopaedic Research Society’s Annual Meeting, 2009

Comparison of Locked and Non-Locked Plate Fixation in Osteoporotic and Normal Bone
Baldini, T; DiMatteo, L; Morgan, S; Williams, A; Phillips, G; Bach, J

Orthopaedic Research Society’s Annual Meeting, 2009

Difference between the Transepicondylar Line and Cylindrical Axis of the Knee Relative to the Femoral and Tibial Mechanical Axes
Winston, Mark; Hancock, Clifton; Bach, Joel; Davidson, Bradley; Baldini, Todd; Eckhoff, Donald

Orthopaedic Trauma Association Annual Meeting, 2007

A Biomechanical Comparison of the Stresses Generated During Insertion of an Antegrade Femoral Nail Using Two Different Insertion Points
Murken, R., Steven J Morgan, J.S., H Baldini, T.B., Williams, A., Smith, W., Bach, J.

Orthopaedic Research Society’s Annual Meeting, 2007

Accuracy of Image Based Computer Assisted Surgery in Acetabular Cup Placement for Supine Two Incision Total Hip Arthroplasty
Mejia H, Dayton MR, Baldini T, Peacher G, Williams A, Borchard K, Bach JM

37th Annual Meeting of the American Association for Hand Surgery, 2007
BIOMECHANICAL COMPARISON OF DIFFERENT VOLAR FRACTURE FIXATION PLATES FOR DISTAL RADIUS FRACTURES
Sobky, K., Baldini, T., Thomas, K., Bach, J, Wolf, J.

6th Biennial ISAKOS Congress, 2007
How Many Anchors are Necessary for Adequate Fixation of Simple Type II SLAP Lesions
McCarty EC, Snyder RL, Gines JL, Baldini TH, Bach JM

Orthopaedic Research Society’s Annual Meeting, 2006
Functional Flexion Axis of the Knee in 3-D Space
DiMatteo, L., Hogan, C., Eckhoff, D., Doucette, T., Rubinstein, D., Baldini, T., Bach, J.

The America Academy of Orthopaedic Surgeons Annual Meeting, 2006
The Effect of Screw Insertion Angle On Pullout Strength In A Locked Plate Model
Alberts, M., Morgan, S., Baldini, T., Repine, M., Bach, J.

The American Academy of Orthopaedic Surgeons Annual Meeting, 2006
3-D Morphology and Mechanics of the Knee Referenced in Computer-Assisted surgical Navigation

The American Academy of Orthopaedic Surgeons Annual Meeting, 2005
3-D Mechanics, Kinematics, and Morphology of the Knee Viewed in Virtual Reality
Eckhoff, D., Bagur, M., Flannery, N., Baldini, T., Reinig, K., Bach, J.

Orthopaedic Research Society’s Annual Meeting, 2004

Cylindrical Model for the Flexion-Extension (FE) Axis of the Knee

Orthopaedic Trauma Association’s 19th Annual Meeting, 2003
The Effect of Screw Insertion Angles on Pullout, Torsion, and Cantilever Bending Strength with an Internal Fixator with Locked Unicortical Screws
Repine, M., Morgan, S., Baldini, T., Bach, J.

The American Academy of Orthopaedic Surgeons Annual Meeting 2003, Scientific Exhibit

Three-Dimensional Morphology of the Distal Part of the Femur Viewed in Virtual Reality
Eckhoff, D., Bach, J., Spitzer, V., DiMatteo, L., Baldini, T., Flannery, N., Bagur, M., Reinig, K.

The American Academy of Orthopaedic Surgeons Annual Meeting 2002, Scientific Exhibit
Three-Dimensional Morphology of the Distal Part of the Femur Viewed in Virtual Reality
Eckhoff, D., Bach, J., Spitzer, V., Baldini, T., Reinig, K.

The American Academy of Orthopaedic Surgeons Annual Meeting 2002
Biomechanical Assessment of Conventional Unit Rod Fixation versus a Unit Rod/Pedicle Screw Construct: A Human Cadaver Study
Erickson, M., Oliver, T., Baldini, T., Bach, J.​​