title: Correlations among measures of knee stiffness, gait performance and complaints in individuals with knee osteoarthritis.
abstract: BACKGROUND
  Stiffness is a common complaint in individuals with knee osteoarthritis and is a component of the osteoarthritis diagnosis. Yet the relationship between stiffness and function is poorly understood and methods to quantify stiffness are limited.
  
  
  METHODS
  Using a cross-sectional observational design with 66 subjects with knee osteoarthritis, stiffness and damping coefficients were calculated from a relaxed knee oscillation procedure. Gait parameters were measured using an electronic walkway. Self-reported pain, stiffness, and function were measured with the Western Ontario and McMaster Osteoarthritis Index. Correlation and Alexander's normalized-t approximation analyses were used to assess associations among the variables. Subset analysis was performed on subjects with and without tibiofemoral joint crepitus.
  
  
  RESULTS
  Slight to moderate correlations existed between stiffness and damping coefficients and most gait parameters ((| r |=0.30-0.56; P<.05) and between Western Ontario and McMaster Osteoarthritis Index scores and all gait parameters (| r |=0.35-0.62; P<.05). The damping coefficient was only slightly associated with patient-rated Western Ontario and McMaster Osteoarthritis Index stiffness subscale scores. Subset analysis revealed significant correlations that differed between those with and without crepitus.
  
  
  CONCLUSIONS
  These findings suggest that laboratory measured stiffness and damping coefficients, Western Ontario and McMaster Osteoarthritis Index scores and gait-related measurements assess different aspects related to movement in individuals with knee osteoarthritis. Stiffness and damping coefficients may offer the ability to explain gait changes in the knee that are independent of a person's perceptions particularly in the early stages of the disease.
authors: Department of Physical Therapy, Arcadia University, Glenside, PA, United States. oatisc@arcadia.edu
authors: Carol A
authors: CA
authors: Oatis
authors: Edward F
authors: EF
authors: Wolff
authors: Margery A
authors: MA
authors: Lockard
authors: Lori A
authors: LA
authors: Michener
authors: Steven J
authors: SJ
authors: Robbins
mesh_terms: D018771:Arthralgia / Q000209:etiology / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D004548:Elasticity; D005260:Female; D005684:Gait; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009068:Movement; D020370:Osteoarthritis, Knee / Q000150:complications / Q000503:physiopathology*; D016474:Weight-Bearing