NDLI: Development and clinical validation of an unobtrusive ambulatory knee function monitoring system with inertial 9DoF sensors

Content Provider	IEEE Xplore Digital Library
Author	Schulze, M. Calliess, T. Gietzelt, M. Wolf, K.H. Liu, T.H. Seehaus, F. Bocklage, R. Windhagen, H. Marschollek, M.
Copyright Year	2012
Description	Author affiliation: Inst. for Med. Inf., Braunschweig, Germany (Gietzelt, M.; Wolf, K.H.) \|\| Dept. of Orthopedic Surg., Hannover Med. Sch., Hannover, Germany (Calliess, T.; Seehaus, F.; Bocklage, R.; Windhagen, H.) \|\| Inst. for Med. Inf., Hannover, Germany (Schulze, M.; Liu, T.H.; Marschollek, M.)
Abstract	Patients suffering from end-stage knee osteoarthritis are often treated with total knee arthroplasty, improving their functional mobility. A number of patients, however, report continued difficulty with stair ascent and descent or sportive activity after surgery and are not completely satisfied with the outcome. State-of-the-art analyses to evaluate the outcome and mobility after knee replacement are conducted under supervised settings in specialized gait labs and thus can only reflect a short period of time. A number of external factors may lead to artificial gait patterns in patients. Moreover, clinically relevant situations are difficult to simulate in a stationary gait lab. In contrast to this, inertial sensors may be used additionally for unobtrusive gait monitoring. However, recent notable approaches found in literature concerning knee function analysis have so far not been applied in a clinical context and have therefore not yet been validated in a clinical setting. The aim of this paper is to present a system for unsupervised long-term monitoring of human gait with a focus on knee joint function, which is applicable in patients' everyday lives and to report on the validation of this system gathered during walking with reference to state-of-the-art gait lab data using a vision system (VICON Motion System). The system KINEMATICWEAR - developed in close collaboration of computer scientists and physicians performing knee arthroplasty - consists of two sensor nodes with combined tri-axial accelerometer, gyroscope and magnetometer to be worn under normal trousers. Reliability of the system is shown in the results. An overall correlation of 0.99 (with an overall RMSE of 2.72) compared to the state-of-the-art reference system indicates a sound quality and a high degree of correspondence. KINEMATICWEAR enables ambulatory, unconstrained measurements of knee function outside a supervised lab inspection.
Sponsorship	IEEE Eng. Medicine Biol. Soc.
Starting Page	1968
Ending Page	1971
File Size	704953
Page Count	4
File Format	PDF
ISBN	9781424441198
ISSN	1557170X
e-ISBN	9781457717871
DOI	10.1109/EMBC.2012.6346341
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Knee Sensors Joints Accelerometers Monitoring Legged locomotion Gyroscopes
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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