Trauma of the wrist

Area of Science:

• Orthopedics and Sports Medicine
• Radiology and Medical Imaging

Background:

• Plain radiographs are the primary diagnostic tool for wrist injuries but have limitations in detecting certain conditions.
• Nondisplaced fractures, early avascular osteonecrosis, and stress fractures are often not visible on initial radiographic imaging.
• Wrist instability evaluation traditionally relies on radiographs, stress views, and fluoroscopy.

Purpose of the Study:

• To highlight the diagnostic utility of magnetic resonance (MR) imaging in evaluating complex wrist injuries.
• To compare the efficacy of MR imaging against plain radiographs and other modalities for specific wrist pathologies.
• To establish MR imaging as a key second-line diagnostic procedure for indeterminate wrist injuries.

Main Methods:

• Review of diagnostic imaging modalities for wrist injuries, focusing on the role of plain radiography and MR imaging.
• Comparison of sensitivity and specificity of different imaging techniques for conditions like occult fractures, avascular osteonecrosis, and stress fractures.
• Evaluation of MR imaging's capability in visualizing soft tissues, including wrist ligaments and the triangular fibrocartilage complex.

Main Results:

• MR imaging enables early diagnosis of radiographically occult fractures, surpassing the sensitivity of follow-up radiographs.
• It provides high sensitivity and specificity for early-stage post-traumatic avascular osteonecrosis, unlike less specific scintigraphy or later-stage radiographs.
• MR imaging effectively demonstrates stress fractures and aids in assessing non-union or pseudarthrosis, offering direct visualization of wrist ligaments and the triangular fibrocartilage complex for instability evaluation.

Conclusions:

• MR imaging is the preferred modality for specific challenging wrist injuries, including occult fractures, early avascular osteonecrosis, and stress fractures.
• It offers superior diagnostic capabilities compared to radiographs and scintigraphy for these conditions.
• MR imaging serves as an essential second-step diagnostic procedure when initial radiographic evaluation of wrist injuries is inconclusive.