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.

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

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.