A motion tracking system is a technology that captures movement from an object or person. These systems can use various types of sensors and methods to collect data on the position, speed, and direction of movement of key points on the object. They are used in fields such as military, entertainment, sports, and medical rehabilitation applications. Currently, the analysis, monitoring, and evaluation of patient movements during rehabilitation are often assessed through manual observation by healthcare personnel or by using expensive motion recording systems. This study proposes and develops a simple, compact, and low-cost measurement system designed to be attached to the patient for assessing the lower limb rehabilitation progress of stroke patients. To verify the accuracy of the developing device, it was mounted on a stand and its position was precisely controlled using a Step Motor. The accuracy of the device was compared with the Encoder values. The measurement error results, evaluated in both static and dynamic conditions, indicate that the quality of the developing device is highly accurate and meets the requirements for human motion measurement devices. Therefore, it can be suggested that the recording system shows promise as a reliable tool and a potential solution for evaluating the lower limb rehabilitation progress of stroke patients, pending further validation through human trials in future studies.