Clinical examinations are subjective and often show a low validity and reliability. Objective and highly reliable quantitative assessments are available in laboratory settings using 3D motion analysis, but these systems are too expensive to use for simple clinical examinations. Qinematic™ is an interactive movement analyses system based on the Kinect camera and is an easy-to-use clinical measurement system for assessing posture, balance and side-bending. The aim of the study was to test the test-retest the reliability and construct validity of Qinematic™ in a healthy population, and to calculate the minimal clinical differences for the variables of interest. A further aim was to identify the discriminative validity of Qinematic™ in people with low-back pain (LBP).
We performed a test-retest reliability study (n = 37) with around 1 week between the occasions, a construct validity study (n = 30) in which Qinematic™ was tested against a 3D motion capture system, and a discriminative validity study, in which a group of people with LBP (n = 20) was compared to healthy controls (n = 17). We tested a large range of psychometric properties of 18 variables in three sections: posture (head and pelvic position, weight distribution), balance (sway area and velocity in single- and double-leg stance), and side-bending.
The majority of the variables in the posture and balance sections, showed poor/fair reliability (ICC < 0.4) and poor/fair validity (Spearman <0.4), with significant differences between occasions, between Qinematic™ and the 3D–motion capture system. In the clinical study, Qinematic™ did not differ between people with LPB and healthy for these variables. For one variable, side-bending to the left, there was excellent reliability (ICC =0.898), excellent validity (r = 0.943), and Qinematic™ could differentiate between LPB and healthy individuals (p = 0.012).
This paper shows that a novel software program (Qinematic™) based on the Kinect camera for measuring balance, posture and side-bending has poor psychometric properties, indicating that the variables on balance and posture should not be used for monitoring individual changes over time or in research. Future research on the dynamic tasks of Qinematic™ is warranted.
Gadotti IC, Armijo-Olivo S, Silveira A, Magee D. Reliability of the craniocervical posture assessment: visual and angular measurements using photographs and radiographs. J Manip Physiol Ther. 2013;36(9):619–25. CrossRef
Granstrom H, Ang BO, Rasmussen-Barr E. Movement control tests for the lumbopelvic complex. Are these tests reliable and valid? Physiother Theor Pr. 2017;33(5):386–97. CrossRef
Yang Y, Pu F, Li Y, Li SY, Fan YB, Li DY. Reliability and validity of Kinect RGB-D sensor for assessing standing balance. IEEE Sensors J. 2014;14(5):1633–8. CrossRef
Microsoft. Kinect hardware 2018 [cited 2018 Accesssed 5 Jan]. Available from: https://developer.microsoft.com/en-us/windows/kinect/hardware.
Qinematic. 2018 [cited 2018 5 Jan]. Available from: http://Qinematic.com/.
Mokkink LB, Prinsen CA, Bouter LM, Vet HC, Terwee CB. The COnsensus-based standards for the selection of health measurement INstruments (COSMIN) and how to select an outcome measurement instrument. Braz J Phys Ther. 2016;20(2):105–13.
Shrout P, Fleiss J. Intraclass correlations: uses in assessing rater reliability. Psych Bul. 1979;86:420–8. CrossRef
Altman DG. Practical statistics for medical research. London: Chapman and Hall; 1991.
Clark RA, Pua YH, Fortin K, Ritchie C, Webster KE, Denehy L, et al. Validity of the Microsoft Kinect for assessment of postural control. Gait Posture. 2012;36(3):372–7.
Clark RA, Pua YH, Oliveira CC, Bower KJ, Thilarajah S, Mcgaw R, et al. Reliability and concurrent validity of the Microsoft Xbox one Kinect for assessment of standing balance and postural control. Gait Posture. 2015;42(2):210–3.
Gill J, Allum JH, Carpenter MG, Held-Ziolkowska M, Adkin AL, Honegger F, et al. Trunk sway measures of postural stability during clinical balance tests: effects of age. J Gerontol A Biol Sci Med Sci. 2001;56(7):M438–47.
Ruhe A, Fejer R, Walker B. The test-retest reliability of centre of pressure measures in bipedal static task conditions - a systematic review of the literature. Gait Posture. 2010;32(4):436–45.
Hodges PW, Moseley GL. Pain and motor control of the lumbopelvic region: effect and possible mechanisms. J Electromyogr Kines. 2003;13(4):361–70. CrossRef
Mokkink LB, Terwee CB, Patrick DL, Alonso J, Stratford PW, Knol DL, et al. The COSMIN checklist for assessing the methodological quality of studies on measurement properties of health status measurement instruments: an international Delphi study. Qual Life Res. 2010;19(4):539–49.
- Reliability and validity of a novel Kinect-based software program for measuring posture, balance and side-bending
Wilhelmus Johannes Andreas Grooten
- BioMed Central
Neu im Fachgebiet Orthopädie und Unfallchirurgie
e.Med Kampagnen-Visual, Mail Icon II