Averaged data of the control (white bars) and preoperative patients (gray bars) with regard to maximum grip aperture. (a) Maximum grip aperture (MGA). Maximum value of distance between the thumb and index finger during reach-to-grasp movements. (b) Time of maximum grip aperture (ToMGA). Time from movement initiation to time at which the MGA occurred. (c) Position of maximum grip aperture (PoMGA). The position at which the MGA occurred relative to the object.