Meniscus degeneration is a common problem in the society and is a health problem that can be seen at any age and affects a large part of the population. The functions of the menisci are load bearing, load transfer, shock absorption and lubrication. Meniscus degeneration occurs as a part of the degenerative process of the knee joint and shows symptoms such as pain and instability in people, and these symptoms are associated with functional limitation. Treatment of meniscus degeneration can be classified as pharmacological, non-pharmacological and surgical treatment. Nonpharmacological treatment uses traditional physiotherapy and rehabilitation approaches such as patient education, exercise therapy, and various physiotherapy applications. Exercises used in the treatment of meniscus degeneration aim to reduce pain, provide joint range of motion, increase knee joint functions, protect muscle strength and joint proprioception. Thus, it is predicted that the participation of patients in social life will increase.

With the developing technology, telerehabilitation applications appear as an alternative approach to traditional physiotherapy approaches. Telerehabilitation provides access to patients by using information and communication technologies and provides rehabilitation services in this way. There are two types of telerehabilitation, synchronous and asynchronous rehabilitation. Applications that allow instant interaction via a webcam for synchronous rehabilitation, telephone or video conferencing connection. Asynchronous rehabilitation, on the other hand, can be defined as applications that transmit recorded video and audio recording data for later interpretation by a specialist. Studies on telerehabilitation are limited in the literature. There are no studies measuring the effectiveness of asynchronous and synchronous telerehabilitation in patients with meniscal degeneration. Especially under the conditions of the COVID-19 pandemic, patients cannot get an appointment for the physiotherapy service, the waiting time for treatment is prolonged, physiotherapy and rehabilitation services are costly, the patients have difficulty in reaching the physiotherapy service due to their geographical location, especially the patients who complain of lower extremity problems travel long distances and reach the rehabilitation unit in long hours. For this reason, the inability to get efficiency from physical therapy enabled us to conduct research on telerehabilitation.

Our study will include 60 patients diagnosed with meniscus degeneration in the Department of Physiotherapy and Rehabilitation of the Faculty of Health Sciences of Marmara University. Volunteers will be informed about the purpose of the study and the evaluations and treatments to be carried out, and their consent will be obtained by reading the 'Informed Volunteer Consent Form' and obtaining their signatures. The sample group and distribution will be determined as 30 asynchronous telerehabilitation groups and 30 synchronous telerehabilitation groups. Our study is a randomized controlled trial. Groups will be formed in a randomized manner and blinded study design will be used to evaluate outcome parameters. Patients beginning the rehabilitation program will be evaluated at the start of the study, at week 4, week 8, and week 16. Demographic information of the patients participating in the study will be obtained using the demographic data form. Visual Analogue Scale (VAS) for pain, WOMET index for functionality and quality of life, functionality with Lysholm Knee Scoring Scale and quality of life with Patient Generated Index (PGI) and Short Form-12 (SF-12) scales; Functional mobility Timed Up and Go Test (TUG), functional capacity 2 Minutes Walk Test (2 MWT), balance Balance Master, proprioception and muscle strength Isokinetic assessment device, lower extremity neuromuscular function level 30 sec Sit Up and 5 Sit \& Go performance tests will be evaluated with Our study will investigate the comparison of the effects of asynchronous and synchronous telerehabilitation programs on pain, functional limitation, muscle strength and quality of life in patients with meniscal degeneration.