Two very common scales used in the assessment of patellofemoral pain syndrome are the anterior knee
pain scale and the lower extremity functional scale. There is only limited evidence regarding how specifically
reliable and meaningful these scales are when assessing the syndrome.The purpose of this study was to assess which
questions in both scales are suitable for patellofemoral pain syndrome patients.20 patients with patellofemoralpain
were recruited from the physiotherapy waiting list of the local hospital and asked to complete the anterior kneepain
scale and the lower extremity functional scale on two occasions at least one week apart. A general test-retest
reliability of the scales was measured in addition withtest-retest and internal consistency of each single question.
Finally,the questions markedas ‘no problem’ in both sessions were also measured. The total scores of the two scales
were found to be highly reliable. However, the anterior knee pain scale revealed five questions with moderate test
retest reliability, two questions with less internal consistency whilst it included three less meaningful questions. The
lower extremity functional scale showed four questions with moderate test retest reliability,one question with less
internal consistency andsix meaningless questions. This study agrees with previous research stating that there are
questions in both scales that can be considered meaninglessand less reliable and should probably be excluded or
replaced with other questions. The study provides useful information for the development of a more appropriate
patellofemoralpain syndrome scale or a modified anterior knee pain scale and lower extremity functional scale for
patellofemoralpain syndrome use only.