Novel application of a Wii remote to measure spasticity with the pendulum test: Proof of concept

• Fair to strong correlation of measurements between Wii and electrogoniometer.
• Small and steady differences between the Wii and the electrogoniometer.
• Both Wii and electro-goniometer can identify spastic limbs (p < .0001*).
• High reliability in quantifying spasticity using critical spastic measure.

BackgroundThe pendulum test is a standard clinical test for quantifying the severity of spasticity. In the test, an electrogoniometer is typically used to measure the knee angular motion. The device is costly and difficult to set up such that the pendulum test is normally time consuming.ObjectiveThe goal of this study is to determine whether a Nintendo Wii remote can replace the electrogroniometer for reliable assessment of the angular motion of the knee in the pendulum test.MethodsThe pendulum test was performed in three control participants and 13 hemiplegic stroke patients using both a Wii remote and an electrogoniometer. The correlation coefficient and the Bland–Altman difference plot were used to compare the results obtained from the two devices. The Wilcoxon signed-rank test was used to compare the difference between hemiplegia-affected and nonaffected sides in the hemiplegic stroke patients.ResultsThere was a fair to strong correlation between measurements from the Wii remote and the electrogoniometer (0.513 < R2 < 0.800). Small but consistent differences between the Wii remote and electrogoniometer were identified from the Bland–Altman difference plot. Within the hemiplegic stroke patients, both devices successfully distinguished the hemiplegia-affected (spastic) side from the nonaffected (nonspastic) side (both with p < .0001*). In addition, the intraclass correlation coefficient, standard error of measurement, and minimum detectable differences were highly consistent for both devices.ConclusionOur findings suggest that the Wii remote may serve as a convenient and cost-efficient tool for the assessment of spasticity.