Comparing Reports Recorded by the Patients at the Time at Which They Feels Pain to What Patients Report at Monthly Visits to Assess Symptoms of Musculoskeletal Diseases.
Patients will be introduced to the use of a mobile application for their smartphone to record the Ecological Momentary Assessment (EMA). This app will ask the patients to assess their pain and function two times daily for 2 months.

After 1 month and at the end of the 2 months, follow-up visits will be performed and patients will be asked to retrospectively evaluate the pain that they suffered and the level of function they had during the last month.
- EligibilityCriteria: Inclusion Criteria:  Symptomatic patients Patients able to give informed consent and to follow the protocol of the study (i.e. able to use a smartphone) Patients >18 years BMI <35 and >18.5 Patients with a smartphone with Android or iOS as operative systems  Exclusion Criteria:  Patients unable to follow the protocol of the study (i.e. unable to use a smartphone, not owning a smartphone or unwilling to download or use the application) Patients with a diagnosis of a musculoskeletal injury but without symptoms Patients without a radiological examination confirming the diagnosis of musculoskeletal disease Patients with planned surgery in the following 60 days Pregnant or lactating woman Patients with other diseases causing pain in the involved joint (e.g. rheumatoid arthritis or other rheumatologic diseases). Surgical treatment in the last year and intra-articular injection in the last 6 months - HealthyVolunteers: No - Gender: All - MinimumAge: 18 Years - StdAgeList: Adult, Older Adult - StudyPopulation: patients with musculoskeletal chronic pain with a clinical and imaging diagnosis of an orthopaedic disease such as knee osteoarthritis, hip osteoarthritis, shoulder osteoarthritis, ankle osteoarthritis, rizoathrosis, meniscectomy treatment, rotator cuff tendinopathy, low-back pain, Achille tendinopathy, patellar tendinopathy,and tennis elbow. - SamplingMethod: Probability Sample