Illustration of articular cartilage thickness and area measurements on a frontal tridimensional high resolution T1-weighted (T1 3D HR) image of the distal interphalangeal joint of a forefoot.

a. Individual measurements of articular cartilage thickness of the middle and distal phalanges, respectively, at 5 predetermined locations (abaxial and central aspects of medial and lateral condyles, and sagittal aspect). b. Individual measurements of articular cartilage areas from the middle and distal phalanges, respectively. c. Measurements of distal interphalangeal space thickness, combining articular cartilage from middle and distal phalanges (same locations as individual measurements in a). d. Measurement of distal interphalangeal space area, combining articular cartilage from middle and distal phalanges. Lateral is to the left.