Der Kieler Arthrograph - Ein Gerät zur Aufzeichnung der aktiven und passiven Schultergelenksbeweglichkeit

The authors describe a new method for measuring the flexibility of the shoulder. They have designed a device consisting of two electrical goniometers to measure the horizontal and the vertical position of the humerus. A computer registers these signals, calculates the region of mobility as a sperical segment centered to the shoulder joint (caput humeri)