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Papers and Presentations -- Lower-Limb Prosthetics
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2004
Hansen, A., Sam, M., Childress, D. (2004) The Effective Foot Length Ratio (EFLR) A Potential Tool for Characterization and Evaluation of Prosthetic Feet. Journal of Prosthetics and Orthotics, Vol. 16, No. 2, 41-45.

Hansen, A., Meier, M., Sam, M., Childress, D. (2004) A Step Ahead: Prosthetic alignment is made easier with a new computer system that has far-reaching implications. ADVANCE for Directors in Rehabilitation, February, 37-40.

Meier, M., Sam, M., Hansen, A., Childress, D. (2004) The Shape&Roll Prosthetic Foot (Part II): Field Testing in El Salvador. Medicine Conflict and Survival, Vol. 20, No. 4, 307-325.

Sam, M., Hansen, A., Childress, D. (2004) Characterization of Prosthetic Feet Used in Low-Income Countries. Prosthetics and Orthotics International, Vol. 28, 132-140.

Sam, M., Childress, D., Hansen, A., Meier, M., Lambla, S., Grahn, E., Rolock, J. (2004) The Shape&Roll Prosthetic Foot (Part I): Design and Development of Appropriate Technology for Low-Income Countries. Medicine Conflict and Survival, Vol. 20, No. 4, 294-306.

2003
Gard, S.A. and Konz, R.J. (2003). The Effect of a Shock Absorbing Pylon on the Gait of Persons with Unilateral Trans-Tibial Amputation. Journal of Rehabilitation Research and Development, 40(2), 109-124.

Hansen, A.H., Meier, M.R., Sam, M., Childress, D.S., Edwards, M.L. (2003) Alignment of Trans-tibial Prostheses Based on Roll-over Shape. Prosthetics and Orthotics International, Vol. 27, No. 2, 89-99.

2001
Sam, M., Hansen, A. H., Childress, D.S. (2001) Biomechanical Characterization of Prosthetic Feet: Results of the USMC E2 Foot. Internal Technical Report, #37, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2001) Biomechanical Characterization of Prosthetic Feet: Results of the Handicap International Prosthetic Foot. Internal Technical Report, #39, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2001) Biomechanical Characterization of Prosthetic Feet: Results of the ICRC Ethiopia Prosthetic Foot. Internal Technical Report, #40, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2001) Biomechanical Characterization of Prosthetic Feet: Results of the ICRC Geneva Prosthetic Foot. Internal Technical Report, #41, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

2000
Hansen, A.H., Childress, D.S., Knox, E.H. (2000) Prosthetic Foot Roll-over Shapes with Implications for Alignment of Trans-tibial Prostheses. Prosthetics and Orthotics International, Vol. 24, No. 3, 205-215.

Hansen, A. (2000) Research on Roll-Over Shape Alignment of Transtibial Prostheses is Directed at Development of a Clinical Aid. Capabilities: Communicating the Science of Prosthetics and Orthotics. Vol. 9, No. 3, 1-2 & 11.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the EB-1 Foot. Internal Technical Report, #29, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the Wooden Keel FUNTER Foot. Internal Technical Report, #30, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the Polypropylene Keel FUNTER Foot. Internal Technical Report, #31, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the ICRC Leaf Spring Prosthetic Foot. Internal Technical Report, #32, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the ICRC Mozambique Foot. Internal Technical Report, #33, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the CADEG Foot. Internal Technical Report, #34, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the Snelson Foot. Internal Technical Report, #35, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Sam, M., Hansen, A. H., Childress, D.S. (2000) Biomechanical Characterization of Prosthetic Feet: Results of the Jaipur Foot. Internal Technical Report, #36, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

1999
Hansen, A.H., "Direct Ultrasound Ranging System as an Alignment Tool for Trans-tibial Prostheses: A Case Study " Internal Technical Report, # 28, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory.

Michaud, S.B., Gard, S.A. and Childress, D.S., "A Preliminary Investigation of Pelvic Obliquity Patterns During Gait in Transtibial and Transfemoral Amputees" accepted for publication in the J. of Rehab. Research & Development, June 23, 1999.

1998
Hansen, Andrew H., "Direct Ultrasound Ranging System as an Alignment Tool for Trans-Tibial Prostheses: A Case Study (Internal Technical Report #28), Jan. 1998.

1997
Miller, L. A., Childress, D.S., "Analysis of a Vertical Compliance Prosthetic Foot," Journal of Rehabilitation Research and Development, Vol. 34, No. 1, pp. 55-62, January 1997.

1996
Gard, S., Childress, D., Uellendahl, J., "The Influence of Four-Bar Linkage Knees on Prosthetic Swing-Phase Floor Clearance," Journal of Prosthetics and Orthotics, Vol. 8, No. 2, pp. 34 - 40, April 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus : Results of the AFFA Foot ," Internal Technical Report Number 012, Northwestern University Rehabilitation Engineering Research Program, January 1996

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Carbon Copy II Foot," Internal Technical Report Number 013, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Carbon Copy III Foot," Internal Technical Report Number 014, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E. and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the College Park Foot and Ankle," Internal Technical Report Number 015, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Dynamic Foot," Internal Technical Report Number 016, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Dynamic Pro Foot," Internal Technical Report Number 017, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox,E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Flex-Walk Foot," Internal Technical Report Number 018, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Quantum Foot," Internal Technical Report Number 019, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Otto Bock SACH Foot," Internal Technical Report Number 020, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E. and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the SAFE II Foot," Internal Technical Report Number 021, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Seattle Foot," Internal Technical Report Number 022, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Seattle Lightfoot," Internal Technical Report Number 023, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using Specially Designed Testing Apparatus: Results of the Springlite Foot," Internal Technical Report Number 024, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the STEN Foot," Internal Technical Report Number 025, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

Knox, E., and Childress, D., "Biomechanical Characterization of Prosthetic Feet Using a Specially Designed Testing Apparatus: Results of the Steplite Strider Foot," Internal Technical Report Number 026, Northwestern University Rehabilitation Engineering Research Program and Prosthetics Research Laboratory, March 1996.

1995
Gard, S., Childress, D., and Uellendahl, J., An Investigation of teh Effect that the Hosmer UltraRoe Lite 4 - Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 008, Northwestern University Prosthetics Research Laboratory, 17 January 1995.

Gard, S., Childress, D., and Uellendahl, J., An Investigation of the Effect that the Hosmer VC-4 4-Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 009, Northwestern University Prosthetics Research Laboratory, 17 January 1995.

Gard, S., Childress, D., and Uellendahl, J., An Investigation of the Effect that the Ohio Willow Wood Pendulum Senior 4-Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 010, Northwestern University Prosthetics Research Laboratory, 17 January 1995.

Gard, S., Childress, D., and Uellendahl, J., An Investigation of the Effect that the USMC OHC 4-Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 011, Northwestern University Prosthetics Research Laboratory, 17 January 1995.

1994
Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation Of The Effect That The Otto Bock 3R36 Habermann 4 - Bar Linkage Knee (Most Stable Alignment) Has On Swing Phase Floor Clearance. Internal Technical Report Number 001, Northwestern University Prosthetics Research Laboratory, 5 December 1994.

Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation of the Effect that the Otto Bock 3R36 Habermann 4 - Bar Linkage Knee (Least Stable Alignment) has on Swing Phase Floor Clearance. Internal Technical Report Number 002, Northwestern University Prosthetics Research Laboratory, 5 December 1994.

Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation of the Effect that the Otto 3R23 Knee Disarticulation 4 - Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 003, Northwestern University Prosthetics Research Laboratory, 5 December 1994.

Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation of the Effect that the Otto Bock 3R70 (Most Stable Alignment) 4 - Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 004, Northwestern University Prosthetics Research Laboratory, 7 December 1994.

Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation of the Effect that the Otto Bock 3R70 (Least Stable Alignment) 4 - Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 005, Northwestern University Prosthetics Research Laboratory, 7 December 1994.

Gard, S.A., Childress, D.S., and Uellendahl, J.E., An Investigation of the Effect that the Otto Bock 3R60 4 - Bar Linkage Knee has on Swing Phase Floor Clearance. Internal Technical Report Number 006, Northwestern University Prosthetics Research Laboratory, 7 December 1994.

1990
Al-Turaiki, H. A., Foot Rotary Mechanism for the Modular Below-Knee Prostheses, J. of Prosthetics & Orthotics, Vol. 2, No 2, pp. 119-125, Winter, 1990.

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