TY - JOUR T1 - Patients Can Provide a Valid Assessment of Quality of Life, Functional Status, and General Health on the Day They Undergo Knee Surgery AU - Lack, Dorothea Z. Y1 - 2008/08/01 N1 - JO - The Journal of Bone & Joint Surgery SP - 1783 EP - 1783 VL - 90 IS - 8 N2 - I read with interest the article "Patients Can Provide a Valid Assessment of Quality of Life, Functional Status, and General Health on the Day They Undergo Knee Surgery" (2008;90:264-70), by Bryant et al. As a psychologist, it seems likely to me that the demand characteristics of the situation on the day of surgery would overwhelm a patient's judgment about quality of life, functional status, and general health. Demand characteristics include concern about the surgeon's opinion, wanting to please the surgeon, and wanting to be seen as a "good" patient. Factors like these have been demonstrated to influence responses and were first reported by Rosenthal as early as 19761. SN - 0021-9355 M3 - doi: UR - http://dx.doi.org/ ER -