Fig. 3

Angle measurement and analysis of ROM by the data glove. The current spread angle between the little and the index finger, measured during the finger spread movement pattern (light blue area), results from the current alignment of the index and the little finger (blue arrows) (A). The current bending angle of the metacarpophalangeal (MCP) joint and the proximal interphalangeal (PIP) joint of the long fingers (light blue areas), results from the alignment of the different sensors during the fist opening movement pattern (B). During the opposition movement of the thumb, the angle to of the carpometacarpal (CMC) joint was determined. The orange arrow signifies the longitudinal alignment of the sensor at the first metacarpal bone in the so-called zero-degree position). The blue arrow indicates the longitudinal alignment of the first metacarpal bone in the current opposition position. In between, the current opposition angle of the CMC joint is illustrated (light blue area). C The maximum range of motion (ROM) is calculated based on the time-angle signal, exemplarily shown for a single movement during the fist opening movement pattern. The maximum angle was measured when forming a fully clenched fist (a). The minimum angle was measured when the long fingers were fully extended (b). The difference between these two points (a, b) is referred to as the delta (Δ)—angle (in °) and represents the maximum ROM (D). The rotation axis is always shown in red