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Muscle strength and range of motion in the knee joint are impacted following total knee replacement and anterior cruciate ligament surgery. As a result, the goal of this research is to design a rehabilitative device to improve knee joint muscle strength and range of motion. The global population of people with mobility disorders is growing, which increases the demand for rehabilitation and physiotherapy devices. Automated assistive tools and devices have shown to be extremely effective and necessary in the treatment of physical injuries and impairments. Physiotherapists might use android technology to remotely set the degrees of flexion/extension, the pace of movement, and duration. The Android application will also save the patient's exercise history and can convey the patient's input about his condition's progress to the physiotherapist.
The normal active knee range of motion is as follows: Knee Flexion ROM: 135 deg (completely bent), Knee Extension ROM: 0 degrees (totally straight). External Knee Rotation ROM: 30-40 deg, Internal Knee Rotation ROM: 10deg Normal passive knee ROM is as follows: Passive Knee Flexion ROM: up to 150deg, depending on leg size - the limit is the calf pushing towards the back of the thigh, Passive knee extension range of motion (ROM): up to 10deg hyperextension is deemed typical.