The paper describes an innovative system designed to allow pre-operative measurements to be performed on the bed of immobilized or difficult to move patients, waiting for the implantation of orthopedic surgical devices. For this purpose, particular attention is paid to measuring the lengths of different bone segments in the clinical examination phase, where the presence of a measurement system capable of providing information about the three-dimensional setting of certain bone margins is needed, accompanied by an easy handling by the medical staff. After the design presentation, we develop an analytical study by determining the differential equations of the movement, simulating the position of the probe with the ROBOTICS toolbox from the MATLAB environment, as well as the time variation of the considered parameters, depending on the non-linear differential equation systems and the values obtained with ROBOTICS.

Keywords: Biomedical system, Measurement accuracy in orthopedics, Sliding measuring system