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We describe a clinical procedure for assessing knee pain: 10 standardised movements of the knee are made (4 active and 6 passive), and the subject's behavioural response to each is scored by the assessor on a 0–3 scale. The total score is the Pain Index of the Knee (PIK). We report investigations of repeatability, inter-assessor agreement, and validity of components of the PIK compared with VAS ratings...
The PIPER (Prompting Intensity of Pain Electronic Recorder) is a compact data-logging device, easily worn by a subject. It emits audible beeps at pre-programmed times, prompting the subject to enter a pain rating by button press. Ratings are stored, for later down-loading. We report two studies suggesting that PIPER pain ratings have good reliability, and good validity assessed against the VAS...
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