What is the FAOS?

FAOS was developed to assess the patients opinion about a variety of foot and ankle-related problems.

FAOS has this far been used in patients with lateral ankle instability, Achilles tendinosis, and plantar fasciitis.

FAOS content is based on the Knee injury and Osteoarthritis Outcome Score (KOOS), content validity was confirmed by 213 patients with ankle instability.

FAOS consists of 5 subscales; Pain, other Symptoms, Function in daily living (ADL), Function in sport and recreation (Sport(Rec), and foot and ankle-related Quality of Life (QOL). The last week is taken into consideration when answering the questionnaire. Standardized answer options are given (5 Likert boxes) and each question gets a score from 0 to 4. A normalized score (100 indicating no symptoms and 0 indicating extreme symptoms) is calculated for each subscale. The result can be plotted as an outcome profile.

FAOS is patient-administered, the format is user friendly, and takes about 10 minutes to fill out.

FAOS is self-explanatory and can be administered in the waiting room or used as a mailed survey.

FAOS has been used in patients 20-60 years old.

FAOS reliability has been confirmed in patients with lateral ankle instability (see User's Guide).

FAOS responsiveness has been confirmed in patients undergoing treatment for Achilles tendinosis (see User's Guide) and plantar fasciitis (work in progress).