title: Association between knee pain and low back pain.
abstract: OBJECTIVE
  To evaluate the association between knee pain and lumbar disorders.
  
  
  METHODS
  The case-control study was conducted at Physical Medicine and Rehabilitation Department, Tabriz University of Medical Sciences, Iran, from December 2009 to March 2011, and comprised patients with primary complaint of knee pain. A separate group worked as controls. The coincidence of knee pain and lumbar disorders were assessed and compared between the two groups SPSS 15 was used for statistical analysis.
  
  
  RESULTS
  Of the 170 patients, 90(53%) were in the case group having 20(22.2%) males and 70(77.7%) females, and 80(47%) in the control group having 18(22.5%) males and 62(77.5%) females. The overall mean age was 46.9±8.9 (range: 25-61years). Age and gender difference between two groups was not significant (p>0.05 each). Lifetime prevalence of radicular, chronic and recurrent low back pain and its point prevalence in the case group were significantly higher than the control group (p<0.05 each). Range of movement of the lower limb and lumbar region in the case group was less than the controls (p<0.05). Local subcutaneous tissue oedema of the lumbar region was more prevalent in the case group (p<0.05). There was no significant difference in vertebral column posture between the two groups (p>0.05).
  
  
  CONCLUSIONS
  The relationship between lumbar and knee pain disorders should be considered in the assessment and management of patients with knee pain.
authors.affiliation: Research Center of Department of Physical Medicine and Rehabilitation, Faculty of Medicine, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Rahbar
authors.affiliation: Neurosurgery Department, Research Center of Department of Physical Medicine and Rehabilitation, Faculty of Medicine, Tabriz University of Medical Sciences, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Shimia
authors.affiliation: Research Center of Department of Physical Medicine and Rehabilitation, Faculty of Medicine, Iran.
authors.forename: Vahideh
authors.initials: V
authors.lastname: Toopchizadeh
authors.affiliation: Physiatry Department, Research Center of Department of Physical Medicine and Rehabilitation, Faculty of Medicine, Tabriz University of Medical Sciences, Iran.
authors.forename: Masud
authors.initials: M
authors.lastname: Abed
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D015897:Comorbidity; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D017116:Low Back Pain / Q000453:epidemiology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000453:epidemiology* / Q000503:physiopathology; D015995:Prevalence; D016059:Range of Motion, Articular
keywords: Knee pain, Low back pain, Lordosis.