Both imaging modalities give a high-diagnostic performance with a good degree of agreement between them, when made by specialized staff. Fetal MRI is a valuable complementary tool to detailed neurosonography which allows an evaluation of the normal brain maturation from the second trimester. It also offers a higher diagnostic performance for some congenital abnormalities such as cortical development or acquired lesions.

When Jacques Lisfranc served as a military surgeon in Napoleon's army, he described a quick forefoot amputation through the tarsometatarsal (TMT) joint to treat the extended dislocation that occurred when the foot was trapped in the stirrup falling from a horse. Although he did not describe any fracture or dislocation, many midfoot structures and injuries were subsequently named for Lisfranc including the TMT joint, the interosseous ligament between the first cuneiform bone and the base of the second metatarsal bone, and the spectrum of injuries along the TMT joints including their stabilizing ligamentous complexes. 1-3There are two different groups of injuries: those secondary to high-energy trauma, with fractures or fracture dislocation of the midfoot, and those secondary to low-energy trauma, with often subtle Lisfranc injuries or sprains. Lisfranc fractures and injuries are rare and frequently overlooked. Delayed diagnosis and treatment can lead to long-term pain and disability, secondary to early osteoarthritis (OA), flattening of the arch, chronic instability, and pain in the midfoot. 2,3Lisfranc injuries and fractures have been cited among the most common reasons for legal claims. The fact that these injuries may occur in the context of polytrauma and may be subtle explains why they are often overlooked. 4,5 Relevant AnatomyThe Lisfranc joint, or TMT joint, is the transition between the rigid midfoot and the relatively flexible forefoot, and structurally it supports the transverse arch of the foot. It includes the joints between the cuneiforms and cuboid with the bases of the five metatarsal bones. Stability is achieved together with the intervening ligamentous structures. These form three different biomechanical and synovial compartments. The medial column or first ray is formed by the first cuneiform (C1) and first metatarsal (M1) and covered by the medial synovial membrane. The intermediate or middle column consists of the second and third ray, formed by the second and third cuneiform (C2 and C3) with the corresponding second and third metatarsals (M2, M3); it is closely related to the cuneoscaphoid joint. The lateral column includes the cuboid, the fourth and fifth metatarsal (M4 and M5), comprising the fourth and fifth ray; its synovial membrane does AbstractThe Lisfranc joint is composed of the cuneiform bones and the cuboid and metatarsal bases, united by a synovial capsule and ligamentous complex. Familiarity with the anatomy is essential for image planning and for understanding injury patterns. The more important structures are the Lisfranc ligament and the plantar ligaments that can be visualized with MR, although careful attention to technique and orientation of scan planes is required for accuracy. A combination of conventional radiographs, computed tomography, and MR allow precise diagnosis of Lisfranc fractures, fracture dislocation, and subtle Lisfranc injuries to guide clinical management and surgical planning.

Müller-Weiss disease (MWD) is the result of a dysplasia of the tarsal navicular bone. Over the adult years, the dysplastic bone leads to the development of an asymmetric talonavicular arthritis with the talar head shifting laterally and plantarly, thus driving the subtalar joint into varus. From a diagnostic point of view, the condition may be difficult to differentiate from an avascular necrosis or even a stress fracture of the navicular, but fragmentation is the result of a mechanical impairment rather than a biological dysfunction.Standardized weight-bearing radiographs (anteroposterior and lateral views) of both feet are usually enough to diagnose MWD. Other imaging modalities such as multi-detector computed tomography and magnetic resonance imaging in early cases for the differential diagnosis can add additional details on the amount of cartilage affected, bone stock, fragmentation, and associated soft tissue injuries. Failure to identify patients with paradoxical flatfeet varus may lead to an incorrect diagnosis and management. Conservative treatment with the use of rigid insoles is effective in most patients. A calcaneal osteotomy seems to be a satisfactory treatment for patients who fail to respond to conservative measures and a good alternative to the different types of peri-navicular fusions. Weight-bearing radiographs are also useful to identify postoperative changes.

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