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MR Imaging of the Diabetic Foot

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MR Imaging of the Diabetic Foot MR Imaging of the Diabetic Foot Eoghan McCarthy, MD, William B. Morrison, MD, Adam C. Zoga, MD* KEYWORDS MR imaging Diabetic foot Osteomyelitis Septic arthritis Neuropathic osteoarthropathy Ulcer Abscess KEY POINTS Osteomyelitis occurs from direct inoculation in most cases, and identification of a skin defect should be the first step in evaluation of all diabetic feet. T2 hyperintensity and T1 hypointensity are required for the diagnosis of osteomyelitis. T2 hyperin- tensity on its own likely represents osseous stress response. Osteomyelitis tends to occur distal to the tarsometatarsal joints and in the malleoli and calcaneus. Neuropathic osteoarthropathy tends to be centered at the Lisfranc, Chopart, or metatarsophalan- geal joints. Imaging findings suggestive of superimposed infection in neuropathic osteoarthropathy are ghosting of bones (indistinct on T1, but present on T2 or T1 postcontrast studies), disappearance of subchondral cysts, and greater-than-expected fluid collections. INTRODUCTION/CLINICAL PRESENTATION ischemia. This ischemia is worsened by coexisting vascular risk factors, including smoking, hyperten- Diabetic patients develop injury and progressive sion, and hyperlipidemia. It is often refractory to diseases of the foot from numerous sources, revascularization of the larger vessels because including disease of the peripheral nervous, of the extent of microvessel disease. Diabetes vascular, and immune systems. There is frequently also inhibits the activity of polymorphonuclear significant overlap between these issues, with leukocytes, reducing cellular immune responses. one-third of all diabetic patients having a mixed 2 1 Collagen and keratin formation is also impaired. neuropathic-ischemic foot ulcer. Sensory, motor, The primary role of imaging is to identify and delin- and autonomic nervous system problems arise in eate the sequelae of these systemic processes, the setting of chronic hyperglycemia. Sensory including soft tissue infection, abscess formation, neuropathy results in the inability to adapt to me- osteomyelitis, and the neuropathic joint. Prompt chanical stresses with resultant soft tissue ulcera- identification and accurate diagnosis are impor- tion and articular structural disruption. Autonomic tant for limb-sparing treatment planning.3 neuropathy deregulates perspiration, skin temper- ature, and arteriovenous shunting resulting in IMAGING THE DIABETIC FOOT excessive callus formation and skin cracking. Mo- tor neuropathy results in intrinsic muscle dysfunc- The first-line examination of the diabetic foot is con- tion or, less commonly, a single nerve defect, most ventional radiographs, which should be performed frequently involving the common peroneal nerve. in at least 3 planes and optimally 4. Relevant radio- Diabetic patients have both large and small vessel graphic findings that should be observed include The authors have nothing to disclose. Division of Musculoskeletal Imaging, Department of Radiology, Jefferson Medical College, Thomas Jefferson University, 132 South 10th Street, Suite 1096A, Philadelphia, PA 19107, USA * Corresponding author. E-mail address: [email protected] Magn Reson Imaging Clin N Am - (2016) -–- http://dx.doi.org/10.1016/j.mric.2016.08.005 1064-9689/16/Ó 2016 Elsevier Inc. All rights reserved. mri.theclinics.com 2 McCarthy et al soft tissue swelling, radiopaque foreign bodies, the subcutaneous soft tissues. For these se- cortical disruption/destruction, periostitis, joint in- quences, traditional spin echo is ideal; but multi- congruity, arterial calcification, and prior amputa- echo acquisitions with a short echo train are tion. Radiographs can also be a beneficial adjunct adequate. Fat suppressed, fast spin echo/turbo in the evaluation of complex midfoot disruption. spin echo T2-weighted images are used to eval- However, radiographs are insensitive to early oste- uate for edema and fluid signal. A short tau inver- omyelitis and notoriously underestimate the extent sion recovery (STIR) sequence is recommended of osseous infection.4 Ultrasound may be used to in at least one plane (generally sagittal) to mitigate evaluate soft tissue processes, such as abscess potential near field homogeneity artifacts. Non- formation and tenosynovitis, and to locate radiolu- contrast examinations are almost always diag- cent foreign bodies. However, this modality is nostic; given the great frequency of renal disease limited in evaluating underlying bone and is also in diabetic patients, contrast is rarely adminis- extremely user dependent. Triple phase bone scans tered. When necessary and feasible, precontrast that should be positive on all 3 phases (angio- and postcontrast fat-suppressed, T1-weighted, graphic, blood pool, and delayed) in the setting of fast gradient-echo sequences can be used to bet- osteomyelitis are sensitive for osseous activity but ter delineate sinus tracts and abscess cavities and not specific.5,6 Scintigraphic studies may be posi- to identify devitalized/necrotic tissue.11,12 Dy- tive in other processes with high bone turnover, namic contrast runs can be helpful in some cases, such as injury and neuropathic osteoarthropathy, as the rate of enhancement can be measured and and even osseous stress response.7 Labeled white compared between normal tissues and devitalized blood cell scans have an increased sensitivity over tissues. To date, 1.5 T is still considered the imag- bone scans; but the major limitation of nuclear med- ing standard. Imaging at 3 T offers theoretic ad- icine is the poor anatomic resolution, thus limiting vantages, with shorter imaging times and/or the usefulness of these studies as a preoperative higher resolution; but it is also prone to more arti- road map.8 MR imaging has emerged as the domi- facts and signal homogeneity issues. nant imaging modality in the assessment of the dia- betic foot, particularly the infected diabetic foot. It MR IMAGING FINDINGS AND DIAGNOSTIC has high sensitivity (90%) and specificity (83%) for CRITERIA IN THE DIABETIC FOOT the diagnosis of osteomyelitis.9,10 Furthermore, it Soft Tissue Edema, Cellulitis has the added benefit of providing good anatomic definition, allowing it to serve as an appropriate Skin thickening and edema (T1 hypointensity and road map for surgical resection. T2 hyperintensity) are findings found in both soft tissue edema and cellulitis. Enhancement on post- contrast imaging is a characteristic feature of MR IMAGING SCAN PROTOCOLS cellulitis. Furthermore, skin thickening and edema The MR imaging examination should be tailored to in the vicinity of soft tissue ulcer or abscess should the site of suspected abnormality. The authors raise suspicion of focal cellulitis rather than bland divide the diabetic foot examination into either soft tissue edema. the ankle, including the ankle and hindfoot, or the Callus, Ulcer foot, including the midfoot and forefoot. This desig- nation allows for focused, smaller field-of-view im- Callus is a focal, masslike infiltration of the subcu- aging for the precise area of concern. Late-model taneous fat, seen as hypointense T1 and intermedi- multichannel ankle/foot receiver coils can provide ate T2 signal.13 Callus enhances on T1-weighted high-resolution imaging from the ankle through postcontrast imaging.14 Typical locations for callus the forefoot with a single acquisition, but prescrip- formation include beneath the first and fifth meta- tion of imaging planes becomes difficult in this sce- tarsal heads and the distal phalanx of the hallux in nario. Most commercial payers still accept foot and the forefoot. In the midfoot, callus forms deep to ankle MR imaging examinations as distinct proced- the cuboid in patients with rocker bottom defor- ures; there are distinct Current Procedural Termi- mities and at the heel in the hind foot.15,16 Chronic nology codes: 73,718 and 73,720. The field of friction at the site of callus can lead to the formation view for either examination can easily be tailored of overlying adventitial bursitis, which appears as a to the location of clinical concern. thin, linear, T2 fluid collection.13 Ulcers typically As a standard protocol, with the use of dedi- result from the breakdown of callus. Identifiable cated extremity receiver coils, 2 sets of acquisi- skin defects and heaped margins will allow differ- tions are obtained in each plane. T1-weighted entiation of these two entities (Fig. 1). Unlike callus, non–fat-suppressed imaging is performed in at ulcers are T2 hyperintense. This high T2 signal is least 2 planes to evaluate the bone marrow and secondary to granulation tissue at the base and Download English Version: https://daneshyari.com/en/article/5727849 Download Persian Version: https://daneshyari.com/article/5727849 Daneshyari.com.
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