Pain and walking as outcome evaluation after knee replacement

In a previous study, walking ability and pain were believed to be a more simple and accurate index for measuring outcome after knee replacement than the global scoring system proposed by the American Knee Society. In this study a common scale was calculated for this and two other measures. First the five-category pain severity scale was combined with walking ability, and then the five-category walking ability was combined with pain measured on a visual analogue scale. The visual analogue scale measure had a poor association with the other indexes but is recommended because it’s more informative and valid.