A physical therapist will be able to determine the ideal angles of rotation for an individual patient, and then direct the patient to the appropriate setting, at which point both parties can be confident that the exercises are being done correctly and without overexertion. The ring is adjusted by sliding it up and down the elastic band to the desired location. The other three locations allow for varying rotation guidance and can be adjusted to approximately 10, 20, and 30 degrees (Figure 1b). The lowest position touches the floor and provides complete stability when the patient is sitting on the ball (Figure 1a). The ring adjusts to four locations on the ball.
Our final prototype design is an adjustable ring that fits securely around an exercise ball using an elastic band.
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