Musculoskeletal ultrasonography: Clinical applications
- George AW Bruyn, MD, PhD
George AW Bruyn, MD, PhD
- Department of Rheumatology
- MC Groep hospitals, Lelystad, the Netherlands
Ultrasonography (US), sometimes referred to as ultrasound imaging or sonography, is an imaging modality that utilizes reflected pulses of high-frequency (ultrasonic) sound waves to assess soft tissues, cartilage, bone surfaces, and fluid-containing structures. Ultrasonographic imaging, once the sole province of radiologists, is becoming more widely available in rheumatology clinics and other ambulatory and emergency settings. However, the widespread use of US by clinicians who diagnose and treat musculoskeletal disorders has been hampered by questions related to the reliability, validity, standardization, methodology, and the ability to detect changes over time. Technical aspects of musculoskeletal ultrasonography, the validity and reliability of image acquisition, and interpretation in rheumatic disorders, primarily in patients with rheumatoid arthritis, are addressed in detail separately. (See "Musculoskeletal ultrasonography: Nomenclature, technical considerations, validation, and standardization".)
The use of US to assess patients with rheumatic diseases in the clinic was fostered by the development of compact real-time US systems in the 1980s. Synovitis of the knee was the earliest musculoskeletal disorder assessed ultrasonographically in the clinic . Ultrasonographic assessment of synovitis of the small joints of the hands in patients with rheumatoid arthritis followed by a decade , aided by the availability in the 1990s of high-resolution transducers that made detailed assessment of superficial structures feasible.
Selected clinical applications of musculoskeletal US are discussed here. An overview of imaging modalities and guidelines for selecting imaging studies (eg, plain film radiography, computed tomography [CT], magnetic resonance imaging [MRI], and US) for musculoskeletal problems are presented separately. (See "Imaging techniques for evaluation of the painful joint" and "Imaging evaluation of the painful hip in adults" and "Radiologic evaluation of the painful shoulder in adults".)
Diagnostic imaging is only one element in the assessment of patients with musculoskeletal symptoms. The clinical approach to such patients, including, in most instances, suggestions regarding the role of diagnostic imaging in their assessment, is discussed in the topics that deal with the initial evaluation of patients presenting with pain in various parts of the body. Examples include shoulder pain, hip pain, and knee pain. (See "Evaluation of the patient with shoulder complaints" and "Evaluation of the adult with hip pain" and "Approach to the adult with unspecified knee pain".)
For the musculoskeletal ultrasonographer, the selection of anatomic structures to image and the planes in which two-dimensional ultrasonography (US) is performed is primarily complaint-driven. Standardized scans and disease-specific protocols for imaging are alternative approaches that are used in certain settings.
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- ACQUIRING IMAGES
- Complaint-driven image selection
- Standardized scanning
- Disease-specific scanning
- ULTRASONOGRAPHY FOR SPECIFIC DISORDERS
- Tendons, ligaments, and muscles
- - Normal tendon and muscle
- - Abnormal tendon and muscle
- - Shoulder tendons
- - Finger tendons
- - Wrist tendons
- - Achilles tendon
- - Enthesitis
- - Subdeltoid-subacromial bursa
- - Olecranon bursa
- - Baker's cyst
- Peripheral nerves
- - Bone
- - Bone erosions
- - Synovitis
- - Cartilage
- Additional ultrasound resources