The goal of this clinical trial is to facilitate the implementation of PROMs-based care for patients with axial spondyloarthritis.

The main questions it aims to answer are:

• What are the barriers, facilitators and strategies to implement PROMs-based care?
• Can the PROMise algorithm successfully review and postpone appointments of eligible patients?
• How feasible is PROMs-based care in patients with axial spondyloarthritis?

Researchers will implement PROMs-Based care and see if PROMs-Based care is feasible and understand patient's opinions on PROMs-Based care implemented.

Participants will:

• Be randomized to either receive intervention (PROM-based care) or control (usual care). Randomisation means assigning you to one of two groups by chance, like tossing a coin or rolling dice.
• That receive PROMs-based care, will be sent PROMs questionnaires that ask them about their health conditions via SMS at a regular interval of 4 months.
• Have their appointments postponed by 4 months, if the PROMise algorithm with specific thresholds (with overview from the rheumatology care team) assess their condition as stable through their blood test results and PROMs questionnaire.
• Have a cap of 12 months between physician visits.

Inclusion Criteria:

• diagnosed with axial spondyloarthritis according to the 2009 ASAS Classification Criteria of AxSpA
• has been receiving care in Singapore General Hospital for at least 6 months
• aged 21 years and above

Exclusion Criteria:

• Bath Ankylosing Spondylitis Disease Activity Index score of >4