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Radionuclide Bone Scintigraphy in Sports Injuries

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Radionuclide Bone Scintigraphy in Sports Injuries Radionuclide Bone Scintigraphy in Sports Injuries Hans Van der Wall, MBBS, PhD, FRACP,* Allen Lee, MBBS, MMed, FRANZCR, FRAACGP, DDU,† Michael Magee, MBBS, FRACP,* Clayton Frater, PhD, ANMT, BHSM,† Harindu Wijesinghe, MBBS, FRCP,‡ and Siri Kannangara, MBBS, FRACP†,§ Bone scintigraphy is one of the mainstays of molecular imaging. It has retained its relevance in the imaging of acute and chronic trauma and sporting injuries in particular. The basic reasons for its longevity are the high lesional conspicuity and technological changes in gamma camera design. The implementation of hybrid imaging devices with computed tomography scanners colocated with the gamma camera has revolutionized the technique by allowing a host of improvements in spatial resolution and anatomical registration. Both bone and soft-tissue lesions can be visualized and identified with greater and more convincing accuracy. The additional benefit of detecting injury before anatomical changes in high-level athletes has cost and performance advantages over other imaging modalities. The applications of the new imaging techniques will be illustrated in the setting of bone and soft-tissue trauma arising from sporting injuries. Semin Nucl Med 40:16-30 © 2010 Elsevier Inc. All rights reserved. he uptake characteristics of the bone-seeking radiophar- Scintigraphy is also capable of detecting bone bruising, an Tmaceuticals are highly conducive to the localization of acute injury resulting from direct trauma that leads to trabec- trauma to bone or its attached soft-tissue structures. Bone ular microfractures without frank cortical disruption.1 The scintigraphy has an inherently high contrast-resolution, greater force transmission involved in cortical fracture en- which enables the detection of the pathophysiology of sures early detection by three-phase scintigraphy. trauma at a nascent stage. Such changes precede structural Acute injury to the articular cartilage usually occurs in the abnormalities, and therefore can be detected earlier than knee or talar dome and may lead to osteochondral fractures. conventional radiology and with a similar temporal course to Repetitive or prolonged muscular action on bone that has not magnetic resonance imaging (MRI). Scintigraphy is an ideal accommodated to the applied stress may lead to stress frac- method for detecting complications, such as the chronic re- ture.2,3 Repeated stress can lead to periosteal resorption that gional pain syndrome (Reflex sympathetic dystrophy) and outstrips the rate of remodeling, weakening the cortex, and nonunion. The recent advent of hybrid imaging devices has resulting in fracture.4 Response to such injury is stereotypic allowed the coregistration of high contrast–resolution bone and characterized by hyperemia, formation of callus, and scintigraphy with the high spatial resolution of computed remodeling, thus leading to avid uptake of the scintigraphic tomography (CT), permitting a new imaging paradigm of agents. immense potential. Clinical Presentation Pathophysiology and Definitions Clinical presentation of fractures is almost always with pain Tissue damage is stereotypically characterized by hemor- that worsens with the intensity of activity. Eventually, pain rhage, necrosis, and calcification. These processes bind the can become so severe that activity will be completely cur- phosphate complexes used in scintigraphy with high affinity. tailed. Examination may reveal point tenderness or diffuse tenderness. Anatomical variants that may predispose to stress injuries, such as pes planus or spastic flat foot may be appar- *Concord Nuclear Imaging, Sydney, Australia. ent. The possibility of predisposing factors for reduced bone †Department of Nuclear Medicine, Concord Hospital, Sydney, Australia. mineral content should be elicited. ‡Department of Rheumatology, National Hospital of Sri Lanka, Sri Lanka. Studies have confirmed that regardless of the care with §Faculty of Medicine, Sydney University, Sydney, Australia. Address reprint requests to Hans Van der Wall, MBBS, PhD, FRACP, Con- which the history and examination is conducted, the average cord Nuclear Imaging, No. 4 Hospital Road, Concord West, NSW 2138, time for a firm diagnosis after sporting injury remains at Australia. E-mail: [email protected] approximately 16 weeks.5 16 0001-2998/10/$-see front matter © 2010 Elsevier Inc. All rights reserved. doi:10.1053/j.semnuclmed.2009.08.006 Radionuclide bone scintigraphy in sports injuries 17 Figure 1 Childhood injuries. (A) Fracture of scaphoid and radial growth plate injury (arrowhead) in a young soccer player who landed heavily on an outstretched left arm. (B, C) Avulsion of the ischial apophysis, sustained by a young hurdler who felt acute pain in the right buttock after coming out of the starting blocks. The fragment is significantly displaced in the plain film. Patterns and Prevalence a ϳ41% improvement in diagnostic accuracy over scintigra- phy alone.8 Specific results in musculoskeletal imaging re- of Injuries by Age and Site main to be assessed, particularly with outcome and cost- The incidence of stress fractures increases with age and ap- benefit data. It is noteworthy that a computerized search of proximately 75% occur before the age of 40 years.5 Nine the National Library of Medicine database under the search percent of fractures occur in children of age Ͻ15 years, 32% heading of SPECT/CT or hybrid imaging produced only 4 in the age group of 16-19 years, and 59% in patients older relevant publications from over 500 “hits.” There are no ex- than 20 years.6 In the pediatric population, pooled data in- isting published prospective studies examining pertinent sci- dicate that 51% occur in the tibia, 20% in the fibula, 15% in entific questions about this new technology in the musculo- the pars interarticularis, 3% in the femur, and 2% in the skeletal setting. metatarsals.7 In adults, 50% occur in the tibia and 14% in the metatarsals with Ͻ1% in the pars interarticularis. Approxi- mately 17% of fractures will be bilateral.5 Childhood Sporting Injuries Acute trauma or chronic stress may involve growth plate Imaging of Sporting Injuries injury as the physis is the weakest portion of the immature skeleton (Fig. 1A). Such injuries usually occur through the The natural history of imaging has a rhythm that is dictated zone of provisional calcification and although this zone heals by advances in technology and the affordability and availabil- well, extension into the germinal zones has the potential for ity of new devices. The history of imaging continues to evolve growth arrest.9 Included in this group of injuries is trauma to in parallel with technological advances that appear to have an the apophysis (Figs. 1B and C), a growth plate that does not ever-decreasing focal length to clinical implementation. contribute to longitudinal growth. Important sites of growth Thus, the simple plain radiograph was augmented by scin- plate injury are the distal radial and proximal humeral physis tigraphy in the 1970s, with the addition of x-ray CT by the in the upper limb and the distal femoral and distal tibial end of the decade. MRI revolutionized imaging of sporting physis in the lower limb. The most commonly affected ap- injuries in the late 1980s with its exquisite contrast resolution ophyses are located in the medial epicondyle (Little leaguer’s for soft-tissue injury. It supplanted bone scintigraphy, par- elbow), olecranon, coracoid, acromion, vertebrae, and ticularly as it detected injury with good spatial resolution and around the pelvis. The osteochondroses are a disparate group was able to detect soft-tissue injury and grade severity. A of disorders characterized by a number of eponyms, such as major shortcoming of MRI was in the imaging of cortical Kohler disease (navicular), Freiberg infraction (second meta- bone injury in which CT was more sensitive. This decade has tarsal head), and Sever disease (calcaneal apophysitis). Oth- seen the advent of hybrid imaging devices, combining CT ers include Osgood–Schlatter disease (tibial tubercle), Sind- with gamma cameras capable of single-photon emission ing-Larsen-Johansson disease (inferior pole of patella), and computed tomography (SPECT). Technological advances in Panner disease (capitellum). SPECT include statistical methods of reconstruction, attenu- ation and scatter correction, and collimator modelling, which have allowed significant improvements in spatial resolution. Injuries in the Lower Limb When these scintigraphic images are coregistered with CT data, the potential for accurate diagnoses is enhanced and the Ankle and Foot technique made more attractive for layman and referrer alike. The blood pool phase is critical in soft-tissue injuries as it shows Preliminary assessment of the hybrid modality has shown hyperemia in the affected structure with delayed uptake appar- 18 H. Van der Wall et al Figure 2 Peroneus brevis tendonitis. The blood pool image shows hyperemia in the distribution of the peroneus brevis tendon as it courses around the lateral malleolus (arrowhead). The delayed study shows increased uptake where the inflamed tendon is in close apposition with the bony structures around the lateral malleolus (arrowheads). ent in bony structures in close apposition as in Figure 2 (other activity in the distribution of the tendon has also been described examples include tibialis posterior tendinosis/medial malleo- with the peroneal tendons (Fig. 2).11 lus). Occasionally, soft tissues show increased uptake in the Impingement Syndromes delayed phase of the study
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