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Implementation of a portable electronic system for providing pain relief to patellofemoral pain syndrome patients
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10.1063/1.3643769
/content/aip/journal/rsi/82/10/10.1063/1.3643769
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/10/10.1063/1.3643769

Figures

Image of FIG. 1.
FIG. 1.

(a) Normal patella position. (b) Dislocated patella position.

Image of FIG. 2.
FIG. 2.

Contraction times of VMO and VL when ascending stairs. Subjects in group A are healthy and those in group B suffer from PFPS.

Image of FIG. 3.
FIG. 3.

Contraction times of VMO and VL when descending stairs. Subjects in group A are healthy and those in group B suffer from PFPS.

Image of FIG. 4.
FIG. 4.

Graph showing the direction in which the quadriceps femoris muscles extend when stretching a leg.

Image of FIG. 5.
FIG. 5.

System structure.

Image of FIG. 6.
FIG. 6.

Electrical stimulation circuit.

Image of FIG. 7.
FIG. 7.

Stair-stepping routine.

Image of FIG. 8.
FIG. 8.

Footswitch is used as the triggering signal for electrical stimulation.

Image of FIG. 9.
FIG. 9.

Measured EMG waveforms of the VL and the VMO.

Image of FIG. 10.
FIG. 10.

Relativity diagram of measured EMG initial actions of the VL and the VMO of normal people and PFPS patients, obtained for the case when the subjects ascend stairs.

Image of FIG. 11.
FIG. 11.

Relativity percentage diagram of the measured EMGs of the VL and the VMO of normal people and PFPS patients, obtained for the case when the subjects descend stairs.

Image of FIG. 12.
FIG. 12.

Output waveform of electrical stimulation circuit.

Image of FIG. 13.
FIG. 13.

Relativity between the footswitch and the EMG signal.

Image of FIG. 14.
FIG. 14.

Relativity diagram of the measured EMG initial actions of the VL and the VMO of the PFPS patients, obtained for the case when the subjects ascend/descend stairs before and after treatment.

Image of FIG. 15.
FIG. 15.

Mean VAS scores for subjects with PFPS. Error bars refer to SDs for the VAS scores in each group over the 6-week intervention.

Image of FIG. 16.
FIG. 16.

Mean Kujala questionnaire for subjects with PFPS. Error bars refer to SDs for the Kujala questionnaire in each group over the 6-week intervention.

Tables

Generic image for table
Table I.

Measured EMG initial actions of the VL and the VMO of normal people and PFPS patients, obtained for the case when the subjects ascend stairs.

Generic image for table
Table II.

The measured EMGs of the VL and the VMO of normal people and PFPS patients, obtained for the case when the subjects descend stairs.

Generic image for table
Table III.

VAS scores for subjects with PFPS.

Generic image for table
Table IV.

Kujala questionnaire for subjects with PFPS.

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/content/aip/journal/rsi/82/10/10.1063/1.3643769
2011-10-03
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Implementation of a portable electronic system for providing pain relief to patellofemoral pain syndrome patients
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/10/10.1063/1.3643769
10.1063/1.3643769
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