Accuracy of Femur Angles Estimated by IMUs During Clinical Procedures Used to Diagnose Femoroacetabular Impingement

Author

McGinnis, Ryan S. ; Cain, Stephen M. ; Sui Tao ; Whiteside, David ; Goulet, Grant C. ; Gardner, Elizabeth C. ; Bedi, Asheesh ; Perkins, Noel C.

Author_Institution

Dept. of Mech. Eng., Univ. of Michigan, Ann Arbor, MI, USA

Volume

62

Issue

6

fYear

2015

fDate

Jun-15

Firstpage

1503

Lastpage

1513

Abstract

We present a novel method for quantifying femoral orientation angles using a thigh-mounted inertial measurement unit (IMU). The IMU-derived femoral orientation angles reproduce gold-standard motion capture angles to within mean (standard deviation) differences of 0.1 (1.1) degrees on cadaveric specimens during clinical procedures used for the diagnosis of Femoroacetabular Impingement (FAI). The method, which assumes a stationary pelvis, is easy to use, inexpensive, and provides femur motion trajectory data in addition to range of motion measures. These advantages may accelerate the adoption of this technology to inform FAI diagnoses and assess treatment efficacy. To this end, we further investigate the accuracy of hip joint angles calculated using this methodology and assess the sensitivity of our estimates to skin motion artifact during these tasks.

Keywords

biomechanics; bone; medical disorders; patient diagnosis; IMU-derived femoral orientation angle; cadaveric specimen; femoral orientation angle quantification; femoroacetabular impingement diagnosis; femur angle accuracy; femur motion trajectory data; hip joint angle accuracy; motion capture angle; skin motion artifact; thigh-mounted inertial measurement unit; Accelerometers; Accuracy; Educational institutions; Gravity; Hip; Joints; Pelvis; Femoroacetabular Impingement; Femoroacetabular impingement (FAI); Hip Angles; Inertial Measurement Unit; hip angles; inertial measurement unit (IMU);

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.2015.2392758

Filename

7012056