Reconstruction of occluded pelvis markers during marker-based motion capture with industrial exoskeletons

• DOI: 10.1080/10255842.2024.2350592
• Publication Date: 2024-05-17T06:26:47Z
• Authors: Jasper Johns; A. Bender; U. Glitsch; L. Schmidt-Bleek; J. Dymke; C. Brandl; P. Damm; K. Heinrich
• Keywords: Motion Capture

Industrial back support exoskeletons are a promising solution to alleviate lumbar musculoskeletal strain. Due the complexity of spinal loading, evaluation EMG data alone has been considered insufficient assess their effects, and complementary kinematic dynamic required. However, acquisition marker-based kinematics is challenging with exoskeletons, as anatomical reference points, particularly on pelvis, occluded by exoskeleton structures. The aim this study was therefore develop validate method reliably reconstruct pelvic markers. movement six subjects, for whom markers could be placed while wearing an exoskeleton, were used test reconstructions compare them landmarks during lifting, holding walking. Two separate approaches reconstruction. One coordinate system based only (EXO), suggested in literature, our proposed adds technical marker region (LUMB) compensate any shifting between pelvis. Reconstruction EXO yielded average absolute linear deviation 54 mm ± 16 (mean 1SD) compared additional LUMB reduced mean deviations 14 7 1SD). Both methods values from literature expected variances due placement soft tissue artifacts. For 99% within defined threshold 24 ±9 91% outside.