The FAAM, short for Foot and Ankle Ability Measure, yields two subscales scored separately, never added. The sport one, on which return to play is decided, declares a threshold of 9 points while its own measurement noise is 12.3, and 18 in French. The calculator is right below.

The Sport subscale declares a clinically important difference of 9 points and a minimal detectable change of 12.3, in the same study. In French, the second rises to 18. The detail is below.

Figures taken from the studies listed at the end of this page, every value carrying its source where it is written. The questionnaire itself is not reproduced.

What the FAAM measures

The FAAM measures what the foot and ankle prevent, across twenty-nine items in two subscales: twenty-one for activities of daily living, eight for sport. Each subscale is scored out of 100 and a high score signals better function.

The point to take away first is that they never add up. The original publication gives them distinct thresholds, never a common one, and this page follows the same rule: the tool at the top yields two figures and refuses to make a third.

The instrument was built in 2005 by item reduction across 1,027 subjects, and it is today the most used measure of that region. Its full French version exists, validated in 2011 in 105 French-speaking patients, and a twelve-item French short form was validated in 2026 in 275 surgical patients.

A denominator that changes from patient to patient

This is the scoring rule most often misapplied, and it is simple once stated.

Each item is scored from 4, no difficulty, to 0, unable to do. But an item can also be marked 'not applicable', and it then leaves the calculation on both sides: it counts neither in the numerator nor in the denominator. The maximum possible is therefore four times the number of items actually scored, and not 84 or 32 by default.

The consequence is that a patient who leaves three sport items not applicable is scored out of 20 and not out of 32. Counting those items as zeros, which a spreadsheet does spontaneously, artificially lowers the score and makes the comparison with the next administration wrong. That is why the tool at the top of this page asks for the number of items scored, and not just the sum.

The sport threshold sits under the noise

Here is the point that should decide the use of the FAAM in athletes, and it comes from its own original publication.

That publication sets for the Sport subscale a minimal clinically important difference of 9 points, and a minimal detectable change at 95 % of 12.3 points. The threshold declared clinically important is therefore buried under the measurement noise of the same instrument, in the same study, on the same sample.

This is no accident. The French version measures 18 points of noise on that subscale, the Japanese 13.7, while the daily-activities subscale stays tight everywhere, at 5.7 then 7 then 6.8. Falling back on the latter to follow an athlete solves nothing: in healthy university athletes it is 100 out of 100 with no dispersion at all. The honest way out fits in one sentence: on the sport side of a French-speaking patient, more than 18 points of change are needed before speaking of progress.

The French version, and the short form

French speakers have two tools, and they do not serve the same moment.

The full French version was validated in 2011 in 105 patients of mean age 50.5 with varied chronic foot and ankle disorders, twenty-two of them retested two days apart. It is the one that gives the two noise figures to remember in French, 7 points and 18 points, along with the error of a single measurement, 8 and 10 points.

The twelve-item short form, validated in France in 2026 in 275 patients operated on for lateral ligament reconstruction, brings what the long version never gave: decision thresholds. A score of 78.1 out of 100 identifies chronic instability status with 81.3 % sensitivity and 85.4 % specificity, and 80.2 marks return to the sport played before the injury at six months. Both values belong to the short form and to that population: carrying them over to the long version would have no basis.

Three administration pitfalls

Adding the two subscales together

They share neither the number of items, nor the noise, nor the responsiveness. No study quoted here works on a total, and manufacturing one drowns the sport subscale, the only one still discriminating in athletes, in the one that hits a ceiling.

Counting a not-applicable item as a zero

A not-applicable item leaves the denominator. Counting it zero drags down the score of a patient who simply has no view on an activity they do not do, and the comparison from one session to the next becomes uninterpretable.

Concluding on ten sport points

Ten points exceed the so-called clinically important difference, 9, but stay below the minimal detectable change, 12.3 in English and 18 in French. That is the zone where the instrument allows no conclusion, and it is wide.

Frequently asked questions

What does FAAM stand for?

FAAM stands for Foot and Ankle Ability Measure. The questionnaire was published in 2005 by Martin et al. for musculoskeletal disorders of the foot and ankle.

How is the FAAM scored?

Twenty-nine items in two subscales, twenty-one for daily activities and eight for sport, scored from 0 to 4. You add the items answered and divide by four times their number: not-applicable items do not count.

How much change counts?

Seven points for daily activities and eighteen for sport in the French version. The so-called clinically important difference, 8 and 9 points, is smaller than the noise on the sport side.

Is there a French version?

Yes, validated in 2011 in 105 French-speaking patients, along with a twelve-item short form validated in France in 2026 in 275 ankle surgery patients.

What score allows return to sport?

The French short form gives 80.2 out of 100 for return to the sport played before the injury at six months, with 75.4 % sensitivity and 87.9 % specificity, in patients operated on for ligament reconstruction.

References

7 sources, PMIDs included

1. Martin RL, Irrgang JJ, Burdett RG, Conti SF, Van Swearingen JM. Evidence of validity for the Foot and Ankle Ability Measure (FAAM). Foot Ankle Int 2005;26(11):968-83. PMID 16309613. The original publication, which builds the instrument by item reduction across 1,027 subjects and sets its two subscales. It gives each its own thresholds, never a total: minimal detectable change of ±5.7 points for daily activities and ±12.3 for sport, clinically important differences of 8 and 9 points. That is where the sport side's problem is born.
2. Borloz S, Crevoisier X, Deriaz O, Ballabeni P, Martin RL, Luthi F. Evidence for validity and reliability of a French version of the FAAM. BMC Musculoskelet Disord 2011;12:40. PMID 21303520. The only published validation of the full French version, in 105 French-speaking patients of mean age 50.5, 22 of them retested. It confirms and widens the gap: minimal detectable change of 7 points for daily activities and 18 for sport. Its full text, open access, also details the variable-denominator scoring rule.
3. Uematsu D, Suzuki H, Sasaki S, Nagano Y, Shinozuka N, Sunagawa N, Fukubayashi T. Evidence of validity for the Japanese version of the foot and ankle ability measure. J Athl Train 2015;50(1):65-70. PMID 25310247. The third independent measurement of the noise, in 83 Japanese university athletes. It gives the same profile as the other two: ±6.8 points for daily activities against ±13.7 for sport. The gap between the two subscales is therefore not a translation accident.
4. Carcia CR, Martin RL, Drouin JM. Validity of the Foot and Ankle Ability Measure in athletes with chronic ankle instability. J Athl Train 2008;43(2):179-83. PMID 18345343. The study that closes the escape route. In healthy university athletes, the daily-activities subscale is 100 out of 100, with no dispersion at all: it no longer discriminates anything at that level of function. Falling back on it to follow an athlete leads nowhere.
5. Matheny LM, Clanton TO. Rasch Analysis of Reliability and Validity of Scores From the Foot and Ankle Ability Measure (FAAM). Foot Ankle Int 2020;41(2):229-36. PMID 31665926. The only Rasch analysis published on the original English version, in 456 patients operated on for the ankle. It examines the structure of the instrument where other studies settle for its coefficients.
6. Saliba I, Grimaud O, Fontanier V, Picot B, Khiami F, Rougereau G, Bohu Y, Lefevre N, Hardy A. Validity and reliability of the French version of the quick-FAAM (Q-FAAM-F) among patients undergoing anatomic ankle ligament reconstruction. J Exp Orthop 2026;13(1):e70644. PMID 41560968. The French validation of the twelve-item short form, in 275 patients operated on for lateral ligament reconstruction. It brings two thresholds no other reference gives: 78.1 out of 100 to identify chronic instability, and 80.2 for return to the sport played before the injury, at six months.
7. Sangeorzan BJ, Ledoux WR, Shofer JB, Davitt J, Anderson JG, Bohay D, Coetzee JC, Maskill J, Brage M, Norvell DC. Comparing 4-Year Changes in Patient-Reported Outcomes Following Ankle Arthroplasty and Arthrodesis. J Bone Joint Surg Am 2021;103(10):869-78. PMID 33983146. Retained for a precise reason: its abstract is the only one in this base to carry explicitly the 0 to 100 range of each subscale, across 517 participants. The bounds on this page come from it, and not from a third-party source.