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Mark W. Lenhoff



Mark Lenhoff has been working in the field of biomechanics and the in the Leon Root Motion Analysis Laboratory at HSS since 1989. He is extremely well versed in all aspects of motion capture, related instrumentation and software. He has programmed devices ranging from microcontrollers for wrist braces to industrial robots for joint mechanics testing.

In Mr. Lenhoff's role as chief engineer he oversees the technical and operational aspects of the laboratory, participates in research, and assists the clinical staff with testing. He collaborates with surgeons, scientists, therapists and believes that presenting technical topics to the clinical staff in an accessible manner is critical for the optimum performance of the laboratory.

His research interests include biomechanics and function of the musculoskeletal system. In addition he has an interest in the application of mobile technology to research, patient education and rehabilitation.



Chief Engineer, Hospital for Special Surgery

State Licensure



Publications by

Selected Publications

Lenhoff MW, Santner TJ, Otis JC, Peterson MG, Williams BJ, Backus SI. Bootstrap prediction and confidence bands: A superior statistical method for analysis of gait data. Gait Posture. 1999 Mar;9(1):10-7

Battaglia MJ, Lenhoff MW, Ehteshami JR, Lyman, S, Provencher MT, Wickiewicz TL, Warren RF. Medial Collateral Ligament Injuries and Subsequent Load on the Anterior Cruciate Ligament: A Biomechanical Evaluation in a Cadaveric Model, American Journal of Sports Medicine 2008

Solomon DJ, Lenhoff M, Wickiewicz T, Warren R, Pearle A. In Situ Force in the Anterior Cruciate Ligament and Knee Kinematics in the Partially and Completely Posterolateral Corner Deficient Knee. Arthroscopy, June 2006,Volume 22 , Issue 6 , e5 - e6

Mootanah R, Imhauser CW, Reisse F, Carpanen D, Walker RW, Koff MF, Lenhoff MW, Rozbruch SR, Fragomen AT, Dewan Z, Kirane YM, Cheah K, Dowell JK, Hillstrom HJ. Development and validation of a computational model of the knee joint for the evaluation of surgical treatments for osteoarthritis. Comput Methods Biomech Biomed Engin. 2014;17(13):1502-17. doi: 10.1080/10255842.2014.899588. Epub 2014 May 1. PMID: 24786914

Kraszewski AP, Osei DA, Garg R, Jang E, Hillstrom HJ, Lenhoff MW, Wolfe SW. The effect of wrist surgery on the kinematic consistency of joint axis reconstruction in a static posture. Journal of Orthopaedic Research; 33(9): 1341-1347, 2015. doi:10.1016/j.jhsa.2015.04.035

Page C, Backus SI, Lenhoff MW. Electromyographic activity in stiff and normal elbows during elbow flexion and extension. J Hand Ther. 2003 Jan-Mar;16(1):5-11.

Mootanah R, Song J, Lenhoff MW, Hafer JF, Backus SI, Gagnon D, Deland JT 3rd, Hillstrom HJ. Foot Type Biomechanics Part 2: are structure and anthropometrics related to function? Gait Posture. 2013 Mar;37(3):452-6. doi: 10.1016/j.gaitpost.2012.09.008. Epub 2012 Oct 26. PMID: 23107624

Wolff AL, Garg R, Kraszewski AP, Hillstrom HJ, Hafer JF, Backus SI, Lenhoff ML, Wolfe SW. Surgical Treatments for Scapholunate Advanced Collapse Wrist: Kinematics and Functional Performance. J Hand Surg Am. 2015 Aug;40(8):1547-53. doi: 10.1016/j.jhsa.2015.04.035. Epub 2015 Jun 17. PMID: 26092664

Hillstrom HJ, Garg R, Kraszewski A, Lenhoff M, Carter T, Backus SI, Wolff A, Syrkin G, Cheng R, Wolfe SW. Development of an anatomical wrist joint coordinate system to quantify motion during functional tasks. J Appl Biomech. 2014 Aug;30(4):586-93. doi: 10.1123/jab.2011-0094. Epub 2014 Mar 10. PMID: 24615208

Carter TI, Pansy BS, Wolff AL, Hillstrom HJ, Backus SI, Lenhoff MW, et al. Accuracy and reliability of three different techniques for manual goniometry for wrist motion: A cadaveric study. J Hand Surg Am. 2009 Oct;34(8):1422-8.

Garg R, Kraszewski A, Holbrrok S, Syrkin G., Hillstrom H, Backus S, Lenhoff M, Wolff A, Crisco J, Wolfe S. Wrist kinematic coupling and performance during functional tasks: Effects of constrained motion. Journal of Hand Surgery. 2014.

Backus SI, Tomlinson D, Vanadurongwan B, Lenhoff MW, Cordasco FA, Chehab E, et al. A spectral analysis of rotator cuff musculature electromyographic activity: Surface and indwelling. HSS Journal. 2011 Feb;7(1):21-8.


Chief Engineer, Hospital for Special Surgery

Industry Relationships

Industry Relationships

One of the goals of HSS is to advance the science of orthopedic surgery, rheumatology, and related disciplines for the benefit of patients. Research staff at HSS may collaborate with outside companies for education, research and medical advances. HSS supports this collaboration in order to foster medical breakthroughs; however, HSS also believes that these collaborations must be disclosed.

As part of the disclosure process, this website lists Research staff collaborations with outside companies if the Research staff member received any payment during the prior year or expects to receive any payment in the next year. The disclosures are based on information provided by the Research staff and other sources and are updated regularly. Current ownership interests and leadership positions are also listed. Further information may be available on individual company websites.

As of May 05, 2017, Dr. Lenhoff reported no relationships with healthcare industry.

By disclosing the collaborations of HSS Research staff with industry on this website, HSS and its Research staff make this information available to patients and the public, thus creating a transparent environment for those who are interested in this information. Further, the HSS Conflicts of Interest Policy does not permit payment of royalties on products developed by him/her that are used on patients at HSS.