정상 성인 족부 방사선 사진에서 족근 중족 관절 선열 형성 빈도 및 정상 변이

Normal Variation and Incidence of Coincided Alignment on Lisfranc Joint on Normal Foot Radiography

The tarsometatarsal joint complex is formed by articulation of the five metatarsal bases with the three cuneiform bones and the cuboid bone. Fracture-dislocation of tarsometatarsal area are difficult to recognize on standard radiographs. The exact diagnosis is occasionally delayed. As a result, improper treatment and late sequelae remains. We decided to make a study of patients with normal foot radiographs on 200 cases. Standard radiographic evaluation was used to study the normal variants of the foot and to evaluate the coincided alignment of the lisfranc joint. Accurate accessment on AP & lateral & $30^{\circ}$ oblique projection of radiographs are very adventageous & important, and next final outcome was detected. : 1. Coincided alignment below 1mm and unfolded lisfranc joint on AP projection was well visalized on 1st cuneiform-metatarsal lateral border and 2nd cuneiform-metatarsal medial border. 2. Coincided alignment below 1mm and unfolded lisfranc joint on oblique projection was well visualized on 2nd cuneiform-metatarsal lateral border and 3rd cuneiform-metatarsal medial border and 3rd cuneform-metatarsal lateral border. 3. More proximal location of 2nd lisfranc joint compared to another joint was 196 cases (98%). It is due to inceleration of 2nd metatarsal base between 3rd & 1st cuneiform. 4. 3rd lisfranc joint was volarward position compared to 2nd listranc on lateral projection at 191 cases (95.5%). It's due to anterior covexity of lisfranc joint. 5. Wide dorsal sided 2nd lisfranc is investigated at 189 cases (94.5%). Because of it. 2nd & 3rd lisfrances are mainly volar dislocated usually. 6. Notching on 5th metatarsal base is visible on 171 cases (85.5%). 7. 4th lisfranc joint had offset normally within $2\sim3mm$ at 98 cases (49%). 8. 5th Lisfranc joint had normally offset within $2\sim3mm$ at 99 cases (49.5%). 9. On lateral projection, slight dorsal location of cuneiform to metatarsal base is investigated at 82 cases (41%).