Precision and repeatability of the Optotrak 3020 motion measurement system

States, Rebecca A.; Pappas, Evangelos

doi:10.1080/03091900512331304556

Cited by 57 publications

(53 citation statements)

References 20 publications

(33 reference statements)

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“…The system has been reported to have minimal measurement error and good precision, along with excellent repeatability. 32 Two seconds of position data corresponding to the most stable range of the 6 second output (between 2 and 4 seconds with less than 5% variation in the output signal) were extracted for each trial. 33 Two upper cervical angles, UCA 1 and UCA 2, were calculated.…”

Section: Methodsmentioning

confidence: 99%

Reliability and validity of cervical position measurements in individuals with and without chronic neck pain

Dunleavy

Neil

Tallon

et al. 2014

Journal of Manual & Manipulative Therapy

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Objectives: The cervical range of motion device (CROM) has been shown to provide reliable forward head position (FHP) measurement when the upper cervical angle (UCA) is controlled. However, measurement without UCA standardization is reflective of habitual patterns. Criterion validity has not been reported. The purposes of this study were to establish: (1) criterion validity of CROM FHP and UCA compared to Optotrak data, (2) relative reliability and minimal detectable change (MDC 95 ) in patients with and without cervical pain, and (3) to compare UCA and FHP in patients with and without pain in habitual postures. Methods: (1) Within-subjects single session concurrent criterion validity design. Simultaneous CROM and OP measurement was conducted in habitual sitting posture in 16 healthy young adults. (2) Reliability and MDC 95 of UCA and FHP were calculated from three trials. (3) Values for adults over 35 years with cervical pain and age-matched healthy controls were compared. Results: (1) Forward head position distances were moderately correlated and UCA angles were highly correlated. The mean (standard deviation) differences can be expected to vary between 1.48 cm (1.74) for FHP and 21.7 (2.46)u for UCA. (2) Reliability for CROM FHP measurements were good to excellent (no pain) and moderate (pain). Cervical range of motion FHP MDC 95 was moderately low (no pain), and moderate (pain). Reliability for CROM UCA measurements was excellent and MDC 95 low for both groups. There was no difference in FHP distances between the pain and no pain groups, UCA was significantly more extended in the pain group (P,0.05). Discussion: Cervical range of motion FHP measurements were only moderately correlated with Optotrak data, and limits of agreement (LOA) and MDC 95 were relatively large. There was also no difference in CROM FHP distance between older symptomatic and asymptomatic individuals. Cervical range of motion FHP measurement is therefore not recommended as a clinical outcome measure. Cervical range of motion UCA measurements showed good criterion validity, excellent test-retest reliability, and achievable MDC 95 in asymptomatic and symptomatic participants. Differences of more than 6u are required to exceed error. Cervical range of motion UCA shows promise as a useful reliable and valid measurement, particularly as patients with cervical pain exhibited significantly more extended angles.

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Section: Methodsmentioning

confidence: 99%

Reliability and validity of cervical position measurements in individuals with and without chronic neck pain

Dunleavy

Neil

Tallon

et al. 2014

Journal of Manual & Manipulative Therapy

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“…Each IRED's position was captured by optoelectronic cameras (Optotrak 3010, Northern Digital, sampling rate 100 Hz). The Optotrak 3D measuring system has outstanding precision and excellent reliability [28]. Offline, missing samples were interpolated using a five-point algorithm and the data were lowpass filtered at 8 Hz.…”

Section: Data Acquisitionmentioning

confidence: 99%

Dopamine replacement therapy does not restore the ability of Parkinsonian patients to make rapid adjustments in motor strategies according to changing sensorimotor contexts

Tunik

Feldman

Poizner

2007

Parkinsonism & Related Disorders

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The ability of dopamine replacement to restore rapid motor adjustments in Parkinson's disease was investigated. Medicated and non-medicated patients performed finger-to-nose movements while simultaneously bending the trunk forward, without vision. Trunk motion was blocked unexpectedly, necessitating rapid adjustments in arm trajectories. Patients exhibited irregular hand paths, plateaus in hand velocity, and prolonged movement times which were significantly greater in perturbed trials. Medication improved kinematics but perturbation-induced disturbances persisted and did not approximate the levels of non-perturbed trials nor those of controls. Dopaminergic replenishment in Parkinson's disease may therefore have limited restorative benefits for rapid context-specific motor control.

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“…The cervical pain caused by extreme postural positions including forward head postures and upper cervical extension angle [27][28][29]. The use of cervical vertebra traction has increased as a part of rehabilitation medicine.…”

Section: Resultsmentioning

confidence: 99%

Precision and repeatability analysis of a motion analysis system for traction therapy

Park¹,

Subramaniyam²,

Min³

et al. 2018

IJET

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Neck pain or cervical pain is most common in individuals who are all working in seated postures for prolonged period of time, example computer users. The pain caused by extreme postural positions including forward head postures and extension angle maintained in cervical. The use of cervical vertebra traction therapy has increased as a part of rehabilitation medicine. However, lack of usability standard in this traction therapy i.e., the exact instructions on how to choose the traction force and location are unclear. To fix this issue, first, the cervical spine traction system analysing the change of cervical spine depending on the traction location has been investigated. Motion analysis systems are widely used to measure the changes in the body part movement. However, the precision and repeatability of motion analysis systems are not much studied. In this paper, the precision and repeatability of a three-dimensional (3D) motion analysis system (i.e., NDI's Optotrak Certus (OC)) is evaluated with developed 3D robot for traction therapy as an application example. The 3D robot quantitated the accuracy and precision of the system regarding angle and distance. Angle and distance among markers showed good agreement between measurements, and comparable measures of precision reported. Experimental results demonstrate a measure of precision and repeatability for the movement of the patients on the cervical traction system; hence the repeatability was satisfactory.

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Precision and repeatability of the Optotrak 3020 motion measurement system

Cited by 57 publications

References 20 publications

Reliability and validity of cervical position measurements in individuals with and without chronic neck pain

Reliability and validity of cervical position measurements in individuals with and without chronic neck pain

Dopamine replacement therapy does not restore the ability of Parkinsonian patients to make rapid adjustments in motor strategies according to changing sensorimotor contexts

Precision and repeatability analysis of a motion analysis system for traction therapy

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