Thumb Osteoarthritis Prognosis for Supported Self-managment

Background

Thumb base osteoarthritis occurs in 21-45% of the adult population over 40 and can cause severe pain and difficulty with essential everyday hand use. Guidelines recommend that those seeking care should receive education and exercises (supported self-management), and, if needed, splints. However, these guidelines are based on research reporting outcomes at three months or less, often excluding those with other hand conditions and co-morbidities. In these studies, self-management was found to provide pain relief for about half of study participants, with the remaining individuals not benefiting significantly in terms of pain at three months. Furthermore, there is no research on the patient's experience of care.

The aim of this study is to investigate, using a mixed methods approach the outcomes, prognosis, and experiences of care in patients receiving usual National Health Service (NHS) care which consists of a supported self-management programme, and to generate recommendations for optimising care for thumb base Osteoarthritis (OA). The design will be a prospective longitudinal cohort study linked with a qualitative interview and focus group study. Four NHS sites will recruit 150 people with symptomatic thumb base OA. The primary outcome is the AUSCAN hand pain scale, additionally baseline assessments will be carried out for measures of hand function, quality of life and known musculoskeletal prognostic factors. The study endpoint is six months. Outcome assessments will be conducted by postal/online questionnaire (as applicable) at three and six months. The qualitative and quantitative results from this study will be integrated and presented to a stakeholder group meeting, where participants will be guided to generate recommendations for future care.

Objectives

• To determine the 6-month outcomes (change in pain, hand function, participation in social roles and activities, and quality of life) in a cohort of patients with thumb base OA receiving supported self-management in specialist NHS services. And to estimate the proportion of those who respond after treatment.
• To evaluate patient experiences with care and determine what factors patients and clinicians perceive contribute to outcome (candidate prognostic factors).
• To investigate the association of prognostic factors with pain and function outcomes.
• To integrate qualitative and quantitative findings to generate recommendations for optimising current care.

STUDY DESIGN

This study is a mixed methods convergent parallel design, and is divided into three parts:

• Prospective cohort study in people with symptomatic thumb base OA receiving a supported self-management programme to provide 3- and 6-month outcome data; and record any subsequent stepped care provided according to existing guidelines.
• Qualitative Research: semi-structured interviews will describe the experience of care and explore patient perception of factors related to outcome, and a focus group will explore treating therapist perceptions of factors related to outcome.
• Stakeholder and PPIE meeting to discuss and disseminate the results with patients and clinicians and to generate recommendations for improving care for patients.

Inclusion criteria

• Symptomatic thumb base OA, confirmed with at least one of the following clinical signs:

• Hard tissue enlargement of the thumb carpometacarpal joint
• Squaring at the base of the thumb
• Crepitus on movement of the thumb carpometacarpal joint
• Positive adduction provocation test
• Positive extension provocation test
• Positive pressure shear test
• Pain on palpation of the dorso-radial aspect of the thumb carpometacarpal joint
• Able to give written informed consent.
• Available to attend Occupational Therapy/Physiotherapy/Hand Therapy sessions.

Exclusion criteria

• Currently receiving therapy care for thumb base OA.
• Fractures or significant injury or surgery to the wrist or hand on the included side in the previous 6 months.
• Previous surgery to the basal thumb joint on the included side.
• Red flags i.e., diagnosed rheumatic condition (gout, rheumatoid arthritis), progressive neurological signs, any acutely swollen hand joint, serious illness, or disease.
• Participants of any drug or medical device trial in the last 12 weeks.
• Recent steroid injection in their included basal thumb joint (2 months prior to baseline appointment).