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.

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