We found a strong level of evidence for a relationship between depression and knee pain , limited evidence for no relationship between anxiety and knee pain , and minimal evidence for no relationship between poor mental health and knee pain .
Conclusions Despite the heterogeneity of the included studies , these data show that depression plays a significant role in knee pain , and that a biopsychosocial approach to the management of this condition is integral to optimising outcomes for knee pain
Background While it is recognized that psychosocial factors are important in the development and progression of musculoskeletal pain and disability , no systematic review has specifically focused on examining the relationship between psychosocial factors and knee pain .
We aim ed to systematic ally review the evidence to determine whether psychosocial factors , specifically depression , anxiety and poor mental health , are risk factors for knee pain .
The PEDro scale is a valid measure of the methodological quality of clinical trials: a demographic study.
QUESTIONS Does the PEDro scale measure only one construct ie , the method ological quality of clinical trials ? What is the hierarchy of items of the PEDro scale from least to most adhered to ? Is there any effect of year of publication of trials on item adherence ? Are PEDro scale ordinal scores equivalent to interval data ? DESIGN Rasch analysis of two independent sample s of 100 clinical trials from the PEDro data base scored using the PEDro scale . RESULTS Both sample s of PEDro data showed fit to the Rasch model with no item misfit . The  PEDro scale item hierarchy was the same in both sample s , ranging from the most adhered to item r and om allocation , to the least adhered to item therapist blinding . There was no differential item functioning by year of publication . Original PEDro ordinal scores were highly correlated with transformed PEDro interval scores ( r = 0.99 ) . CONCLUSION The PEDro scale is a valid measure of the method ological quality of clinical trials . It is valid to sum PEDro scale item scores to obtain a total score that can be treated as interval level measurement and subjected to parametric statistical analysis
We found a strong level of evidence for a relationship between depression and knee pain , limited evidence for no relationship between anxiety and knee pain , and minimal evidence for no relationship between poor mental health and knee pain .
Conclusions Despite the heterogeneity of the included studies , these data show that depression plays a significant role in knee pain , and that a biopsychosocial approach to the management of this condition is integral to optimising outcomes for knee pain
Background While it is recognized that psychosocial factors are important in the development and progression of musculoskeletal pain and disability , no systematic review has specifically focused on examining the relationship between psychosocial factors and knee pain .
We aim ed to systematic ally review the evidence to determine whether psychosocial factors , specifically depression , anxiety and poor mental health , are risk factors for knee pain .