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[Articular complications in sickle cell-thalassemia after childhood. Diagnostic problems]
1I Cattedra di Radiologia, Università La Sapienza, Roma.
Insights
Drepanocytosis-thalassemia (DT) patients face osteoarticular issues like bone infarction and infection. Differentiating these conditions is crucial for effective treatment and preventing complications.
Area of Science:
- Hematology
- Orthopedics
- Radiology
Background:
- Osteoarticular complications are significant in drepanocytosis-thalassemia (DT).
- These include bone infarction (avascular necrosis) and infectious processes like septic arthritis and osteomyelitis.
- Early diagnosis is vital to prevent severe sequelae such as pathological fractures and chronic osteomyelitis.
Purpose of the Study:
- To highlight the diagnostic challenges in differentiating osteomyelitis (OM) from avascular necrosis (AVN) in DT patients.
- To propose a diagnostic protocol for early and accurate differentiation of these conditions.
- To evaluate the utility of bone scintigraphy and MR imaging.
Main Methods:
- Case report of four DT patients presenting with bone infarcts and osteomyelitis.
- Review of literature on osteoarticular complications in DT.
- Analysis of 99m-Tc-MDP bone scans and discussion of 99m-Tc colloid marrow scintigraphy and MR imaging.
Main Results:
- Roentgenographic features of AVN and acute OM can be similar, posing a diagnostic challenge.
- 99m-Tc-MDP bone scans showed increased uptake in both AVN and OM locations, lacking differential diagnostic value.
- 99m-Tc colloid marrow scintigraphy and MR imaging show promise for differential diagnosis.
Conclusions:
- Accurate differentiation between OM and AVN in DT is essential for appropriate management.
- A suggested protocol utilizes 99m-Tc colloid marrow scintigraphy for initial differentiation.
- MR imaging is identified as a highly promising future tool for definitive diagnosis.
Abstract:
The osteoarticular complications of drepanocytosis-thalassemia (DT) include: 1) bone infarction, or avascular necrosis (AVN), common at all ages; 2) acute septic arthritis and hematogenous osteomyelitis, that usually affect infants and children. Early diagnosis and treatment of the osteoarticular infectious complications is imperative, to maximize the chances of a favorable outcome, and to prevent the sequelae, ie pathological fractures, chronic osteomyelitis. Early roentgenographic features of involved areas are similar in acute osteomyelitis and in AVN--both of which cause painful bone crises, so as to make osteomyelitis (OM) a diagnostic challenge. Four cases of DT are reported. The patients, 17 to 37 years old, presented with bone infarcts. One of them (the youngest) had also multiple osteomyelitis of long bones. The 99m-Tc-MDP bone scans, performed only on the youngest patient, affected by OM, revealed increased uptake in both AVN and in OM locations, without differential diagnostic features. After a review of the literature, a diagnostic protocol is suggested, based on 99m-Tc colloid marrow scintigraphy for the early differential diagnosis between acute OM (normal or slightly-increased uptake), chronic OM (markedly increased uptake), and AVN (decreased uptake). Furthermore, MR imaging is stressed as the most promising tool, in the next future, for this kind of differential diagnosis.