Table 1 Participant timeline

Timepoint in months

− 3^¼ to − 6^¼

− 3 to − 6

− 1^½ to − 4^½

0 to − 3

0*

0

¼

3

6

12

Enrolment

 Patient information and consent

x

 Informed consent collection

x

 Validation of inclusion and exclusion criteria

x

 Randomization

x

Interventions

 Organize rehabilitation

x

 Rehabilitation checkpoint

x

x

x

x

x

 Needling (with PRP or Saline)

x

Assessment

 Clinical evaluation

x

x

 Elbow echography

x

x

x

x

x

 Demographics

x

 Rehabilitation efficacy assessment

x

x

 Primary outcome assessment

x

 Clinical outcome assessment

x

x

x

x

x

x

x

 Concomitant therapy, surgery

x

x

x

x

x

x

x