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J Korean Radiol Soc. 2005 Nov;53(5):381-386. English. Original Article.
Choi YS , Kim SM , Lee KT , Young KW , Bae SJ , Ahn JM , Shin MJ .
Department of Radiology, Eulji Hospital, Eulji University School of Medicine, Korea.
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea.
Department of Orthopedic Surgery, Eulji Hospital, Eulji University School of Medicine, Korea.
Department of Radiology, Samsung Medical Center, Sungkyunkwan University, Korea.

PURPOSE: To define the radiological features of the naviculo-medial cuneiform coalition. MATERIALS AND METHODS: This study examined 35 feet from 25 patients (mean age 26 years) with a naviculo-medial cuneiform coalition. The images were analyzed retrospectively with regard to irregular articular surface, subchondral sclerosis, subchondral cyst, beak-like spur, the change in joint space, bony fusion seen on plain radiographs (n=35) and CT (n=14), and the histological type of coalition on MRI (n=3). The extent of joint involvement was also evaluated. RESULTS: Of the 35 feet, plain radiographs and/or CT showed an irregular articular surface in 34 (97.1%), subchondral sclerosis in 30 (85.7%), a subchondral cyst in 29 (82.9%), a beak-like spur in 23 (65.7%), a narrowing of the joint space in 24 (68.6%) and no bony fusions (0%). The T1-weighted images revealed low signal intensity, and the T2-weighted fast spin-echo and gradient images revealed high signal intensity in the three feet with a cartilaginous coalition. The coalition involved the plantar part of the joint in all 35 feet. CONCLUSION: The characteristic radiological features of a naviculo-medial cuneiform coalition include an irregular articular surface with possible secondary degenerative changes in the plantar margin of the joint, non-osseous type.

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