Article

The KOOS-PS represents a shortened version of the Knee Injury and
Osteoarthritis Outcome Score (KOOS) Function and Sport scales. Previous
investigations have not evaluated the KOOS-PS against performance measures or
self-report measures composed of items that assess a broad spectrum of ability
levels. OBJECTIVE: The purpose of this study was to compare the construct
validity of the KOOS Function and Sport subscales with a shorter version of the
measure (KOOS-PS). METHODS: Using a cross-sectional, observational design,
consecutive consenting patients diagnosed with knee osteoarthritis were recruited
at an assessment center visit to determine need for conservative or surgical
management. Participants completed the Lower Extremity Functional Scale (LEFS),
KOOS, Timed "Up & Go" Test, and Six-Minute Walk Test. A single function-sport
score (KOOS FunSportsum) and the KOOS-PS were abstracted from the KOOS. Pearson
correlation coefficients were compared between the reference standards' scores
(performance measures and LEFS) and KOOS scores. KOOS-PSraw scores were compared
with KOOS-PSRasch scores. RESULTS: Three hundred seventy-seven patients with a
mean age of 64.4 years (SD=10.5) participated. The correlation between
performance reference standard and KOOS-PSRasch scores was significantly lower
than with KOOS FunSportsum scores (mean difference in r=.08 [95% confidence
interval=.03, .11], z=4.45, P1<.001). A similar finding was observed with the
LEFS comparison. LIMITATIONS: The study sample did not consist of many patients
with mild or severe functional status limitations. CONCLUSIONS: For patients with
knee osteoarthritis, the KOOS-PS appears too restricted in item content to
provide a comprehensive estimate of lower extremity functional status level
relative to the KOOS Function and Sport subscales. Pursuit of a computer-adapted
test may be a productive direction for future inquiry.
CI - (c) 2014 American Physical Therapy Association.

Langue : ANGLAIS