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The Leg Activity measure (LegA)

The Leg Activity measure (LegA) is a measure of difficulty in passive and active function for application following focal rehabilitation intervention and in particular for spasticity (botulinum toxin and physical) interventions.  The active and passive sub-scales of the tool are treated as separate constructs, which nevertheless are related and are both important in the achievement of clinically relevant goals.  The LegA is therefore likely to have utility in practice for evaluation of spasticity intervention and other focal interventions such as task practice training for active function improvement.  The LegA is unique in addressing these constructs and being patient reported for evaluation of function in the ‘real life’ context. 


  • The LegA is a valid, reliable and responsive measure for the evaluation of treatment in leg spasticity and other focal interventions related to rehabilitation of the leg following neurological injury or damage.
  • Principal components analysis confirmed that the active and passive function and Impact on Quality of Life subscales forming three separate constructs. 
  • Construct validity was supported for ‘passive function’, ‘active function’ and ‘impact on quality of life’. 
  • Cronbach’s alpha was 0.86, 0.97 and 0.87 respectively for the scales. Item level test-retest agreement ranged from 91-97% (Kappa 0.75-0.95). 
  • Following treatment for spasticity (n=64), the Leg Activity measure ‘passive function’ and ‘impact on life’ scales were responsive to change. 
  • Principal components analysis confirmed the constructs and a unidimensional Rasch Partial Credit Model was subsequently established for each scale. Transformation to an interval scale was achieved. Using the ordinal-to-interval conversion tables, parametric statistical analysis may be used



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