Validation of joint angle measurements: comparison of a novel low-cost marker-less system with an industry standard marker-based system
Authors: Bahadori, S., Davenport, P., Immins, T. and Wainwright, T.W.
Journal: Journal of Medical Engineering and Technology
Volume: 43
Issue: 1
Pages: 19-24
eISSN: 1464-522X
ISSN: 0309-1902
DOI: 10.1080/03091902.2019.1599072
Abstract:Human motion tracking is widely used for the assessment of movement dysfunction in orthopaedic patients. Currently, most clinical motion analysis centres use marker-based three-dimensional (3D) systems as they are deemed to be the most accurate method. However, due to space, costs and logistics they are not available in many clinical settings. This study compared joint angles measured in functional tests using the novel low-cost Microsoft Kinect Perfect Phorm system with the established marker-based Nexus VICON system. When measuring right and left knee flexion, the average difference between the VICON and Kinect Perfect Phorm measurement was 13.2%, with a SD of 19.6. Both overestimation and underestimation of the joint angle was recorded in different participants. Although the average percentage difference during hip abduction tests was lower at −3.9%, the range of error was far greater (SD = 75). From this, it can be concluded that the level of accuracy presented in the new low-cost Kinect Perfect Phorm system is not yet suitable for clinical assessments. However, for general tests of performance, and for tracking cases where absolute accuracy is less critical, future versions of this software may have a place.
https://eprints.bournemouth.ac.uk/31008/
Source: Scopus
Validation of joint angle measurements: Comparison of a novel low cost marker-less system with an industry standard three-dimensional marker-based system
Authors: Bahadori, S., Davenport, P., Immins, T. and Wainwright, T.
Conference: International Society of Physical and Rehabilitation Medicine (ISPRM)
Abstract:Introduction/Background Human motion tracking is widely used for assessment of movement dysfunction in orthopaedic patients. Currently, most clinical motion analysis centres use marker based three-dimensional systems as they are deemed to be the most accurate method. However, due to space, costs and logistics they are not available in many clinical settings. This study compared joint angles measured in functional tests using the novel low-cost Microsoft Kinect Perfect-Phorm marker-less system with the established marker based Nexus VICON system.
Material and Method Ten unimpaired volunteers were fitted with 16 retroreflective markers in the positions specified by the Plug-in-Gait (PiG) lower limb marker set. Participants were asked to make three movements: standing, a squat action and a hip abduction action. The two measurement systems were used simultaneously to measure changes in joint angle. The collection of data from each participant was synchronised manually between each system. Average values for left and right knee flexion (for the squat task) and left hip abduction (for the hip abduction task) were obtained from each system as the average across the steady state, and the relative change between the standing and task sections used as the basis of comparisons of system performance. Results When measuring right and left knee flexion, the average difference between the VICON and Perfect-Phorm measurement was 13.2%, with a SD of 19.6. Both overestimation and underestimation of the joint angle was recorded in different participants. Although the average percentage difference during hip abduction tests was lower at -3.9%, the range of error was far greater (SD=75).
Conclusion From this, it can be concluded that the level of accuracy presented in the new low cost Perfect-Phorm marker-less system is not yet suitable for clinical assessments. However, for general tests of performance, and for tracking cases where absolute accuracy is less critical, future versions of this software may have a place.
https://eprints.bournemouth.ac.uk/31008/
Source: Manual
Validation of joint angle measurements: Comparison of a novel low cost marker-less system with an industry standard three-dimensional marker-based system
Authors: Bahadori, S., Davenport, P., Immins, T. and Wainwright, T.
Conference: 12th World Congress of the International Society of Physical and Rehabilitation Medicine.
Dates: 8-12 July 2018
Journal: Annals of Physical and Rehabilitation Medicine
Volume: 61S
Pages: e439
Publisher: Elsevier
ISSN: 1877-0657
https://eprints.bournemouth.ac.uk/31008/
Source: Manual
Validation of joint angle measurements: comparison of a novel low-cost marker-less system with an industry standard marker-based system.
Authors: Bahadori, S., Davenport, P., Immins, T. and Wainwright, T.W.
Journal: Journal of medical engineering & technology
Volume: 43
Issue: 1
Pages: 19-24
eISSN: 1464-522X
ISSN: 0309-1902
DOI: 10.1080/03091902.2019.1599072
Abstract:Human motion tracking is widely used for the assessment of movement dysfunction in orthopaedic patients. Currently, most clinical motion analysis centres use marker-based three-dimensional (3D) systems as they are deemed to be the most accurate method. However, due to space, costs and logistics they are not available in many clinical settings. This study compared joint angles measured in functional tests using the novel low-cost Microsoft Kinect Perfect Phorm system with the established marker-based Nexus VICON system. When measuring right and left knee flexion, the average difference between the VICON and Kinect Perfect Phorm measurement was 13.2%, with a SD of 19.6. Both overestimation and underestimation of the joint angle was recorded in different participants. Although the average percentage difference during hip abduction tests was lower at -3.9%, the range of error was far greater (SD = 75). From this, it can be concluded that the level of accuracy presented in the new low-cost Kinect Perfect Phorm system is not yet suitable for clinical assessments. However, for general tests of performance, and for tracking cases where absolute accuracy is less critical, future versions of this software may have a place.
https://eprints.bournemouth.ac.uk/31008/
Source: Europe PubMed Central
Validation of joint angle measurements: Comparison of a novel low cost marker-less system with an industry standard three-dimensional marker-based system
Authors: Bahadori, S., Davenport, P., Immins, T. and Wainwright, T.
Conference: 12th World Congress of the International Society of Physical and Rehabilitation Medicine (ISPRM)
Publisher: Annals of Physical and Rehabilitation Medicine, 61 (Supplement) e439
ISSN: 1877-0657
https://eprints.bournemouth.ac.uk/31008/
Source: BURO EPrints