title: Validity and reliability of a new assessment of lower-extremity dysfunction.
abstract: OBJECTIVE
  A 20-variable assessment system for evaluation of lower-extremity dysfunction has been constructed with special consideration of the needs of the physical therapist. The variables are classified into five subgroups: hip impairment, knee impairment, physical disability, social disability, and pain.
  
  
  METHODS
  One hundred five patients with osteoarthrosis of the hip and knee, all accepted for total joint replacement arthroplasty, were tested. The mean age of the patients was 69 years (SD = 9.0, range = 46-91).
  
  
  METHODS
  The original grouping of the variables was analyzed for content validity with a factor analysis. The results from a subgroup of 42 patients were tested for intertester reliability with the Goodman-Kruskal gamma coefficient.
  
  
  RESULTS
  The factor analysis indicated a factor solution consistent with the primary grouping except for two variables. The correlation between two independent physical therapists was .99 to 1.00 for different variables, indicating excellent intertester reliability.
  
  
  CONCLUSIONS
  In the authors' opinion, the new assessment system provides a reasonably valid, reliable, inexpensive, and easy-to-use measurement and fulfills the needs of the physical therapist for functional evaluation of the lower extremity.
authors.affiliation: Department of Physical Therapy, County Hospital, Eksjö, Sweden.
authors.forename: U
authors.initials: U
authors.lastname: Oberg
authors.forename: B
authors.initials: B
authors.lastname: Oberg
authors.forename: T
authors.initials: T
authors.lastname: Oberg
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000503:physiopathology; D010003:Osteoarthritis / Q000503:physiopathology*; D015207:Osteoarthritis, Hip / Q000503:physiopathology*; D016059:Range of Motion, Articular; D015203:Reproducibility of Results