Mobile Apps for Foot Measurement in Pedorthic Practice : Scoping Review
Table 6 : Assessment criteria for the measurement functionality of apps .
Measurement criteria Google Play Store ( n = 11 ), n (%) Apple App Store ( n = 15 ), n (%) Total ( N = 26 ), n (%) Foot length 6 ( 55 ) 7 ( 47 ) 13 ( 50 ) Foot width 6 ( 55 ) 5 ( 33 ) 11 ( 42 ) Foot arch ( medial ) height 1 ( 9 ) 2 ( 13 ) 3 ( 12 ) Foot instep girth 0 ( 0 ) 1 ( 7 ) 1 ( 4 ) Foot joint girth ( ball girth ) 0 ( 0 ) 3 ( 20 ) 3 ( 12 ) Short heel girth 0 ( 0 ) 0 ( 0 ) 0 ( 0 ) Long heel girth 0 ( 0 ) 0 ( 0 ) 0 ( 0 ) Heel width 0 ( 0 ) 2 ( 13 ) 2 ( 8 ) Shoe size 2 ( 18 ) 2 ( 13 ) 4 ( 15 ) Forefoot tilt 0 ( 0 ) 2 ( 13 ) 2 ( 8 )
3D foot model reconstruction
1 ( 9 ) 10 ( 67 ) 11 ( 42 )
study ’ s objective ). During the review , no star ratings for the apps SUNFeet , Ortholutions , AARA Orthotics , and Aqualeg were found , and thus these apps were excluded from the calculation of the total standard deviation .
Measurement Criteria for Apps
The key function of foot measurement apps is the measurement of foot dimensions so that the users are aware of the current condition of their feet . In accordance with the selected measurement criteria for foot measurement apps , we evaluated the comprehensiveness of the reviewed apps regarding the criteria . As shown in Table 6 , there was substantial variation in the number of foot dimensions measured by the apps . Table 6 provides a transformed view of the number of measurement items of apps as discussed in the Measurement-Specific Functionality subsection of the Methods section .
The general distribution of the measured foot dimensions of the reviewed apps was very low overall . From the total of 26 apps , only 50 % can measure foot length , 42 % can measure foot width , 15 % can determine shoe size for users , 12 % can measure foot instep height and ball girth , and 4 % can measure foot instep girth and heel width . Important dimensions that are crucial for the construction of shoes , insoles , and foot wedges ( eg , for bicycle pedals , saddles ) were missing from the measurement features offered by all of the reviewed apps . Most of the reviewed apps from Google Play Store were poor compared to those available from Apple App Store . However , since apps were excluded based on duplication across app stores and region-restriction criteria , this information should not be used to reflect the current state of platform-specific apps ( ie , Android devices have a lower variety of apps devised for foot measurement compared to iOS devices ).
Further evaluation of the measurement criteria showed that the maximum number of dimensions measured by a foot measuring app was five . No app measured more than half of the required foot measurement
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