Figure 3. Percent of elderly patients in severe pain before and after knee replacement surgery, by type of activity

77.4 percent were in severe pain when using stairs before replacement; 14.0 percent were in severe pain when using stairs after replacement; 58.5 percent were in severe pain when walking on flat ground before replacement; 5.8 percent were in severe pain when walking on flat ground after replacement; 52.6 percent were in severe pain when standing upright before replacement; 9.7 percent were in severe pain when standing upright after replacement; 24.3 percent were in severe pain when sitting or lying down before replacement; 4.3 percent were in severe pain when sitting or lying down after replacement; 30.4 percent were in severe pain at night in bed before replacement; and 6.3 percent were in severe pain at night in bed after replacement.

Source: Hawker G, Wright J, Coyte P, et al. Health-related quality of life after knee replacement. J Bone Joint Surg Am 1998;80(2):163-73.

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