This case report describes the process and outcome of an intervention where illness perceptions (IPs)
were targeted in order to reduce limitations in daily activities. The patient was a 45-year-old woman
diagnosed with posttraumatic secondary osteoarthritis of the lateral patella-femoral cartilage of the right
knee. At baseline, the patient reported maladaptive IPs on the Brief Illness Perception Questionnaire
Dutch Language Version and limitations in walking stairs, cycling and walking. Fewer limitations in daily
activities are hypothesized by changing maladaptive IPs into more favourable IPs. In this case report,
discussing maladaptive IPs with the patient was the main intervention. A participatory decision making
model was used as a design by which the maladaptive IP were discussed. Six out of eight maladaptive IPs
changed favourably and there was a clinically relevant decrease in limitations of daily activities. The
Global Perceived Effect was rated as much improved