The study hypothesis is that the prevalence of obstructive sleep apnea in patients presenting for total knee or total hip arthroplasty is higher than generally suspected. The study will include just one arm and results will be compared to a literature control group. Participants referred for preoperative evaluation will be screened using a standard questionnaire. Those at high risk of obstructive sleep apnea will then undergo a formal overnight sleep study (polysomnography).

The study hypothesis is that the prevalence of obstructive sleep apnea in patients presenting for total knee or total hip arthroplasty is higher than generally suspected. The study will include just one arm and results will be compared to a literature control group, a study performed by Harrison et al. and published in the December 2003 issue of The Journal of Arthroplasty. Participants referred for preoperative evaluation will be screened using a standard questionnaire. Those at high risk of obstructive sleep apnea will then undergo a formal overnight sleep study (polysomnography). The Berlin questionnaire is being used for screening.

Inclusion Criteria:

• 18 years old and older
• Planned total hip or total knee arthroplasty
• Referral to the internal medicine preoperative evaluation clinic

Exclusion Criteria:

• None

Subjects are all patients referred to an academic internal medicicine preoperative evaluation clinic prior to hip or knee arthroplasty.

9 months

Serious and other (nonserious) adverse events were not collected.

Obstructive sleep apnea was diagnosed in only four patients due to a high rate of failure to undergo PSG by patients for whom it was indicated. A second major weakness is the use of a literature control group.