[Linearity and error correction of the Meyer/dal Ri hinge axis measurement system].

Measurement errors inherently related to the instrument and those due to external factors were analysed for the SAS hinge axis measurement system in conjunction with the digital recording system. An optical bench served as measurement apparatus. Linearity errors are substantially less than 0.1 mm and thus of no clinical relevance. A slight reduction in the size of the movement coordinates imaged with slight incongruences of the six measurement canals results from erroneous calibration. The recording system proves to be insusceptible to interference by external factors in practical application. The projection error correction we investigated experimentally was satisfactory. Merely the processing quality of the electrical wiring attached to the measuring foils was not fully satisfactory.