This study consists of a pre-established surgical preparation program in cooperation with physiotherapists or physical activity instructors, dieticians, psychologists, physical therapists and nurses.~This innovative program improves muscle strength, balance and walking of the study patients. It also allows for faster and better recovery of their physical fitness and intellectual abilities after surgery.~These interventions will be performed in day admission (DA) and at home and will consist of training, a diet program to strengthen the muscles and balance of the patients participating in the study.~Patients who agree to participate in the study will receive interventions for 6 weeks prior to surgery, partly in a day hospital and partly at home, including:~Muscle rehabilitation developed with a physiotherapist or physical activity instructor~Nutritional support (dietician at 1st, 3rd, and 6th day admission (DA), referring geriatrician)~Cognitive and physical stimulation Exergame (Genious Healthcare); with only cognitive exercises at home~Psychological support by a psychologist~Information in the form of videos on the main risks and important points to know and prepare before and after surgery~1 follow-up call per week made by the PRE4OS referent between each day admission (DA) to assess patient satisfaction, any limitations encountered, possible exercises at home, the occurrence of possible adverse effects~1 hour per week home adapted physical activity session by the Siel Bleu association
The main objective of this multicentric, prospective and interventional study is to assess the feasibility of multimodal prehabilitation in patients aged 75 years or older with surgical indication for coxarthrosis or severe gonarthrosis