| ObjectiveThrough comparing sectional anatomic specimen with MRI imaging , locating at the position of sagittalia, oblique coronal and oblique - axial plane of metatarsus including Lisfanc joint and Chopart joint, describe the configuration of special bones, joints and anatomic details linking with the ligament as well as the MRI imaging characters; find out the best displaying plane in all anatomic structure; accumulate the sectional anatomic data of metatarsus at the position of sagittalia, oblique coronal and oblique ?axial plane for the purpose of offering the definite morphologic foundation for imaging diagnosis of metatarsus pathologic changes.Materials and MethodsSelect fresh citizen's body and take 12 cases of broken main body of foot region, being abovelO cm from the ankle. According to the position of human body's lying on the back and keeping foot region at relax position, place and fix the specimen of foot region within the coin of limbs and trunk. Employing the features of special sign of fatty tissues displaying in MRI, use capsule vitamin E to have a body surface locating for all imaging plane of foot region specimen. Afterwards, have separately MR imaging at the position of sagittalia, oblique coronal and oblique - axial plane. According to the line of locating signsof capsule vitamin E, freeze the large part of foot region specimen. Then following the line on the surface of body, have a manufacture of all plane sectional specimens by electric band saw. After the treatment of sectional specimens, compare the record and MRI imaging.Results(1) Oblique - axial plane: on this plane, the arrangement of all metatarsal bones and the corresponding relation can be clearly displayed, and morphological features also can be observed. Especially the transverse arrangement of all metatarsus bone and its corresponding relation can be clear at a glance. For example, the end of the first and third under surface of metatarsal bone corresponding with medial, intermediate and lateral sphenoid bones, the fourth, fifth under surface of metatarsal bone corresponding with cuttefish bones and penetrating inside foot and lateral border, lateral margin Lisfranc joint can be clearly observed. Appearing as horizontal shape as "~" Chopart joint also can be displayed very well. The dividing line of forefoot, midfoot and metapedes can be clearly distinguished. Talonavicular joint, scaphoid bone and cuneonavicular joints which located on the back or among three cuneiform bones, interosseous cuneometatarsal joint locating between the lateral sphenoid bone and cuttefish bone call be clearly displayed in MR imaging and sectional anatomic specimen. Otherwise, most of ligaments of all parsis jointing with oblique - axial plane can be clearly demonstrated. Included; IMT ligaments, Interosseous intercuneiform ligaments, intercuneiform and cuttefish ligaments, TMT ligaments, Dorsal intercuneiform ligaments and etc. Especially Lisfranc ligaments can be displayed capitally, the full lengthof Lisfranc ligments can be recognized, showing as well - proportioned banded structure with low signs between Lateral surface of Medial cuneiform bones and second under surface of plantar metatarsal bones.(2) Plana Sagittalia: clearly indicate the relationship of plantar metatarsal bone and the corresponding tarsi, such as astragalus and foot navicular, foot navicular and intercuneiform as well as the relationship of the front of bone and cuboid. In the way of displaying the joints, it also can be observed that the joints formed by anterior and posterior position take advantages. Especially talocalcaneonavicular joint is best shown. The discriminating ligaments mainly include TMT ligaments, relying mainly on Dorsal TMT ligaments, Dorsal cuneona-vicular ligaments, intercuneiform ligaments and plantar ligaments of tarsus can be displayed. ( 3 ) Oblique - Coronal Plane: for angle of the section and major axis of metatarsal bone is 90?, the transect configuration of each short axis of midfoot is rather clear, being useful for s... |
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