The effect on gait kinematics with prefabricated Jalas® insoles compared to standard insoles
Authors
Johansen, Toke Hartmann ; Lassen, Lasse Engberg Treu
Term
4. semester
Education
Publication year
2016
Submitted on
2016-06-03
Pages
11
Abstract
This thesis examines whether prefabricated Jalas® insoles, selected via the company’s FootStopService (FSS) based on a static foot assessment, influence gait kinematics compared with standard insoles in running shoes, and whether FSS agrees with the Foot Posture Index (FPI), used here as the reference. Volunteers were assessed on FSS to receive high-, neutral-, or low-arch insoles; FPI was performed to classify foot type. During treadmill walking, dynamic plantar pressure was captured using an in-shoe pedar-X system under two randomized conditions: standard insoles and Jalas® insoles. Primary outcomes included total plantar pressure, center-of-pressure (CoP) distribution at the heel and forefoot, and stance time; the hypothesis was that Jalas® insoles would lower pressure, lengthen stance time, and shift CoP more laterally at the heel and more medially at the forefoot. Due to attrition and data errors, the final sample was very small. Results showed no significant differences between Jalas® and standard insoles in CoP distribution, stance time, or total plantar pressure. In contrast, FSS and FPI classifications diverged substantially: 45% were misclassified by FSS relative to FPI (p < 0.001), indicating that FSS could not be validated in this cohort. Overall, in this small sample, Jalas® insoles did not measurably alter pressure or timing parameters of gait versus standard insoles, and the static selection tool showed poor agreement with a clinically validated reference. Future work should rely on validated foot posture measures (e.g., FPI), consider adaptation periods and cross-over designs, and include larger, more homogeneous samples.
Denne opgave undersøger, om præfabrikerede Jalas®-indlægssåler, udvalgt via Jalas’ FootStopService (FSS) baseret på en statisk fodvurdering, påvirker gangkinematik sammenlignet med standardsåler i løbesko, og om FSS stemmer overens med Foot Posture Index (FPI), som blev brugt som reference. Frivillige blev testet på FSS for at få anbefalet høj-, neutral- eller lavsvangs-indlæg; FPI blev udført for at klassificere fodtypen. Under gang på løbebånd blev dynamisk plantarftryk målt med et i-sko pedar-X system ved to randomiserede betingelser: standardsåler og Jalas®-såler. Primære mål omfattede samlet plantarftryk, center-of-pressure (CoP)-fordeling ved hæl og forfod samt standsfase-tid; hypotesen var, at Jalas®-såler ville reducere tryk, forlænge standsfasen og flytte CoP mere lateralt på hælen og mere medialt på forfoden. På grund af frafald og datafejl endte studiet med en meget lille endelig stikprøve. Resultaterne viste ingen signifikante forskelle mellem Jalas®- og standard-indlæg i CoP-fordeling, standsfase-tid eller samlet plantarftryk. Derimod var der en betydelig uoverensstemmelse mellem FSS og FPI: 45% blev fejlklassificeret af FSS i forhold til FPI (p < 0,001), hvilket betyder, at FSS ikke kunne valideres i denne kohorte. Samlet set ændrede Jalas®-indlæg ikke målelige tryk- eller tidsparametre under gang sammenlignet med standardsåler i denne lille prøve, og det statiske udvælgelsesværktøj viste lav overensstemmelse med en klinisk valideret reference. Fremtidige studier bør anvende validerede fodpostur-mål (fx FPI), overveje tilvænningsperioder og cross-over design samt inkludere større og mere homogene deltagergrupper.
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Keywords