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Table 1 Eligibility criteria

From: Acute flares of knee osteoarthritis in primary care: a feasibility and pilot case-crossover study

Inclusion criteria

Mode of ascertainment

 Male or female aged ≥ 40 years

GPSS

 Registered as a permanent resident with participating general practices

GPSS

 Recorded consultation for knee OA or knee OA-related joint symptoms in the last 2 years†

GPSS

 Access to an email account and to the Internet

PCRF

Exclusion criteria

 Known diagnosis of inflammatory arthropathy, spondyloarthropathy, or crystal arthropathy (e.g. rheumatoid arthritis, ankylosing spondylitis, reactive arthritis, systemic lupus erythematosus, gout, psoriatic arthritis)†

GPSS

 Recorded diagnosis of fibromyalgia†

GPSS

 Red flags: recent significant trauma to knees; acutely hot swollen joint

GPSS, PCRF

 Previous total knee arthroplasty or on waiting list for total knee arthroplasty

GPSS, PCRF

 Corticosteroid injection into the knee in the last 3 months

PCRF

 Surgery to either knee within the past 3 months

GPSS, PCRF

 Unable to complete questionnaires written in English via the study website

PCRF

 Vulnerable individuals (e.g. psychiatric illness, learning difficulties, dementia, terminal illness, and severe enduring mental ill health)

GPSS

  1. GPSS general practice search and screen, PCRF patient-completed reply form
  2. †Based on code lists (available at http://www.keele.ac.uk/mrr/morbiditydefinitions/)