Table 3. Risk factors.

Sherman et al 7	Patient age > 50 y, tourniquet time > 60 min
Armstrong et al 5	Administration of intra-articular corticosteroids, length of surgery
Armstrong and Bolding 6	Administration of intra-articular corticosteroids
Clement et al 14	Age,15–49 y; male; diabetic; morbidly obese; tobacco use; high-complexity procedure; in low-complex procedure: patient age < 50 y and male sex
Wyatt et al 15	White patients (univariate regression analysis); patient age > 40 y (univariate and multivariate regression analyses)
Yeranosian et al 11	Male sex, patient age < 60 y