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Comparison of angular measurements by 2D and 3D gait analysis
Jönköping University, School of Health Science. Jönköping University, School of Health Science, HHJ, Dep. of Rehabilitation.
Jönköping University, School of Health Science. Jönköping University, School of Health Science, HHJ, Dep. of Rehabilitation.
(English)Student thesis
Abstract [en]

Abstract

Objective: To validate the use of a 2-dimensional video based system (Hu-m-an digitizing

software, HMA Technology Inc. Ontario, Canada), for measuring sagital plane knee and ankle

angles during gait analysis.

Design: Criterion-based, concurrent validation.

Participants: 18 persons without any gait disorders.

Method: The participants were subjected to simultaneous capture of their motion data with a digital

video camera filming in the sagital plane only, and a 3-dimensional optoelectronic motion capture

system (Qualisys Medical AB, Gothenburg, Sweden). The data was analyzed both using Hu-m-an

digitizing software (HMA Technology Inc. Ontario, Canada) and Visual 3D (C-motion Inc.,

Kingston, Canada) respectively.

Outcome: Relative angles for the knee and ankle.

Results: Significant difference was found between the systems for measuring ankle angles

(p<0,05). No significant difference was found for measuring knee angles at stance, but significant

differences was present during swing and at IC (p<0,05).

Even though significant differences were found, the correlation, between the two systems, was high

for the knee, and moderate to high for the ankle.

Conclusion: Hu-m-an digitizing software (HMA Technology Inc. Ontario, Canada) has been

demonstrated to be a promising tool for measuring 2-dimensional sagital plane knee and ankle

angles, but cannot be validated from this study alone.

Keywords: Gait measurement, validation, 2-dimensional analysis, 3-dimensional analysis,

digitizing, kinematics, joint angles.

Abstract [sv]

Sammanfattning

Målsättning: Att validera användningen av ett 2-dimensionellt videobaserat system (Hu-m-an

digitizing software, HMA Technology Inc. Ontario, Canada), för att mäta knä- och ankelvinklar i

sagittalplanet under gång.

Design: Criterion-based, concurrent validation.

Deltagare: 18 personer utan gångproblem.

Metod: Deltagarens rörelsemönster mättes av en digital videokamera som filmade i sagittalplanet

och av ett 3-dimensionellt optoelektroniskt rörelsesanalyssystem (Qualisys Medical AB,

Gothenburg, Sweden) samtidigt. Data analyserades genom att använda både Hu-m-an

digitaliseringsmjukvara (HMA Technology Inc. Ontario, Canada) och Visual 3D (C-motion Inc.,

Kingston, Canada).

Undersökta parametrar: Relativa vinklar för knä och ankel.

Resultat: Signifikant skillnad observerades mellan systemen vid mätning av ankelvinkeln (p<0,05).

Ingen signifikant skillnad observerades vid mätning av knävinklar i ståfasen, men signifikant

skillnad observerades i svingfasen och vid hälkontakt (p<0,05).

Även om det fanns en signifikant skillnad var korrelationen mellan de två systemen hög för knäet,

och moderat till hög för ankeln.

Konklusion: Hu-m-an digitaliseringsmjukvaran (HMA Technology Inc. Ontario, Canada) tyder på

att vara ett lovande verktyg för att mäta 2-dimensionella knä- och ankelvinklar i sagittalplanet, men

kan inte valideras enbart ifrån denna studie.

Nyckelord: Gång mätningar, validering, 2-dimensionel analys, 3-dimensionel analys, digitalisering,

kinematik, led vinklar.

Identifiers
URN: urn:nbn:se:hj:diva-6588OAI: oai:DiVA.org:hj-6588DiVA, id: diva2:113552
Presentation
(English)
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Available from: 2008-12-09 Created: 2008-10-21 Last updated: 2008-12-09Bibliographically approved

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