First metatarsophalangeal joint synovial hypertrophy associated with vitamin D status in type 2 diabetes mellitus: An ultrasound-graded study

Figure 1 Schematic diagram of ultrasonographic semi-quantitative grading of synovial hypertrophy of the metatarsophalangeal joint. M: Metatarsal head; P: Proximal phalanx; SH: Synovial hypertrophy; A: The line connecting the apices; B: The horizontal line of the metatarsal head apex; a: The region between the articulating bones apices; b: The region from metatarsal head apex to diaphysis. For synovial hypertrophy (thickness 0.88 mm) in region b, using line A as the reference line, synovial hypertrophy will be judged as grade 2, and using line B as the reference line, it will be judged as grade 1.

Figure 2 Ultrasound characteristics of semi-quantitative grading of metatarsophalangeal joint synovial hypertrophy located in the region from metatarsal head apex to diaphysis. A: Mild synovial hypertrophy (1b); B: Moderate synovial hypertrophy (2b); C: Severe synovial hypertrophy (3b). M: Metatarsal head; P: Proximal phalanx; SH: Synovial hypertrophy; Dashed line: The horizontal line of the metatarsal head apex.