关键词: 跖板, 2-5跖趾关节, 影像解剖, MRI, 超声

Abstract:

Objective　To study and measure morphological feature of less plantar plates by MRI and ultrasound, and improve the understanding of its value on clinical diagnosis.    Methods   Nineteen fresh-frozen human cadaveric foot specimens (seventy-six less plantar plates) were scaned by MRI and ultrasound. The imaging morphology of less plantar plates was observed；the length, width, central thickness and lateral thickness of less plantar plate were measured.　Results　The planter plate was showed distinctly with Proton density and was smooth and curvilinear in MRI images. In addition, the planter plate was scanned dynamically and flexibly in ultrasound, showing slightly echoic band. The length of the less plantar plates in MRI was (18.36±1.30) mm，(17.88±0.89) mm, (16.67±1.22) mm，and (14.26±1.11) mm; The width in MRI was (10.98±0.71) mm，(10.10±2.21) mm，(10.07±0.52) mm，and (9.07±0.65) mm; The lateral thickness in MRI was (2.07±0.13) mm，(2.05±0.12) mm，(1.87±0.22) mm，and (1.79±0.24) mm; The central thickness in MRI was (1.34±0.16) mm，(1.32±0.14) mm，(1.13±0.14) mm, and (1.05±0.13) mm. The less plantar plates of length in ultrasound was (17.05±1.31) mm, (16.98±1.12) mm, (15.77±1.80) mm，and (12.18±1.38) mm; The width in ultrasound was (12.19±0.74) mm，(11.63±0.79) mm, (11.08±0.77) mm，and (10.44±0.86) mm; The lateral thickness in MRI was (1.83±0.17) mm, (1.76±0.21) mm, (1.61±0.27) mm, and (1.48±0.21) mm; The central thickness in MRI was (1.14±0.14) mm，(1.06±0.15) mm, (1.04±0.15) mm, and (0.94±0.12) mm. The measuring results of less plantar plates in MRI and ultrasound were different and the parameter differences were statistically significant (P<0.05).　Conclusions　Both MRI and ultrasound can show the planter plates distinctly and they play an important role for examination of plantar plates.

Key words:  Plantar plate, Lesser metatarsophalangeal joint, Imaging anatomy, MRI, Ultrasound