References
- Waddell G, McCulloch JA, Kummel E, et al. Nonorganic physical signs in low-hack pain. Spine 1980, 5(2): 117–25
- Main CJ, Waddell G. Behavioral responses to examination: a reappraisal of the interpretation of “nonorganic signs.” Spine 1998; 23(21): 2367–71
Reference
- Mulvey JR. Differential diagnosis of patellofemoral pain syndrome. (Letter) Am Fam Physician 1994; 50(4): 768–71
Reference
- Skinner HB, ed. Current diagnosis and treatment in orthopedics. 1st ed. Norwalk, Conn: Appleton & Lange, 1995: 128