We are interested in knowing whether you are having any difficulty at all with the activities listed below because of your lower limb problem for which you are currently seeking attention. Please provide an answer for each activity.

Scale:

0 = Extreme difficulty or unable to perform activity

1 = Quite a bit of difficulty

2 = Moderate difficulty 

3 = A little bit of difficulty 

4 = No difficulty

Today, do you or would you have any difficulty at all with:

Office Use Only

Scoring instructions:

The columns on the scale are summed to get a total score. The maximum score is 80.

Interpretation of scores

• The lower the score the greater the disability.
• The minimal detectable change is 9 scale point.
• The minimal clinically important difference is 9 scale points.
• % of maximal function = (LEFS score) / 80 * 100

Performance:

• The potential error at a given point in time was +/- 5.3 scale points.
• Test-retest reliability was 0.94.
• Construct reliability was determined by comparison with the SF-36. The scale was found to be reliable with a sensitivity to change superior to the SF-36. Lower Extremity Functional Scale (LEFS) 

Source: Binkley JM, Stratford PW, Lott SA, Riddle DL. The Lower Extremity Functional Scale (LEFS): scale development, measurement properties, and clinical application. North American Orthopaedic Rehabilitation Research Network. Phys Ther. 1999 Apr;79(4):371-83.