Diagnostic Approach for Acute Hip Hematoma

Initial Imaging Approach for Hip Pain/Trauma

The American College of Radiology recommends that the standard initial imaging for acute hip pain or trauma should include an anteroposterior (AP) view of the pelvis with a cross-table lateral view of the symptomatic hip, allowing for optimal detection of both hip and pelvic fractures, which often occur concomitantly 1, 3
Including the pelvis view provides the crucial benefit of comparing the affected hip with the contralateral asymptomatic side, which is essential for accurate diagnosis 3

Despite being the first-line imaging, radiographs have limitations in sensitivity and specificity, with approximately 10% of proximal femoral fractures not identified on initial radiographs, highlighting the need for further imaging if clinical suspicion remains high 3
If radiographs are negative but clinical suspicion for fracture remains high, the American College of Radiology recommends MRI without IV contrast as the next imaging study, due to its near 100% sensitivity for proximal femoral fracture detection 1, 4

According to the American College of Radiology, ultrasound does not play a role as the initial imaging in hip fracture detection, due to its poor specificity (only 65%) for fracture detection, even when performed by experienced sonographers 1, 2, 5
While ultrasound can detect trauma-related changes such as joint effusion with high sensitivity, it cannot comprehensively evaluate the bones and soft tissues of the pelvis, making it an inadequate primary diagnostic tool 2

The American College of Radiology recommends beginning with standard radiographs: AP view of pelvis and cross-table lateral of the symptomatic hip, followed by MRI without IV contrast if radiographs are negative but clinical suspicion remains high 3, 4, 5

Relying solely on ultrasound for diagnosis of hip trauma can lead to missed fractures and potentially altered treatment decisions, as it has limited sensitivity and specificity for fracture detection 2
Failing to obtain proper orthogonal radiographic views can lead to missed fractures, emphasizing the importance of thorough initial imaging 3
Delays in diagnosis and treatment are associated with increased complications, length of hospital stay, and mortality, highlighting the need for prompt and accurate diagnosis 3