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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/)