CT Scan for Trochanteric Bursitis, Iliopsoas Tendinitis, and Abductor Tendon Pathology
CT is not the appropriate imaging modality for suspected trochanteric bursitis, iliopsoas tendinitis, or abductor tendon pathology—it is less sensitive for soft tissue evaluation and will likely miss these diagnoses.
Why CT is Inadequate
The ACR Appropriateness Criteria explicitly state that when extra-articular soft tissue abnormalities like tendonitis are suspected with normal radiographs, "CT is less sensitive for soft tissue evaluation" 1. This is a critical limitation because:
- Trochanteric bursitis involves fluid distension of the bursa between the iliotibial band and greater trochanter
- Iliopsoas tendinitis affects the tendon and surrounding soft tissues
- Abductor tendon pathology (gluteus medius/minimus) includes tendinosis, tears, and degenerative changes
While CT can occasionally demonstrate a distended trochanteric bursa as a low-attenuation lesion 2, this is an incidental finding and CT lacks the soft tissue resolution to reliably detect tendinopathy, partial tears, or early pathologic changes.
The Correct Imaging Approach
After normal radiographs, MRI or ultrasound should be the next imaging study—not CT 1.
MRI is the Gold Standard
- Highly sensitive and specific for detecting soft tissue abnormalities around the hip
- Visualizes iliopsoas bursitis, trochanteric bursitis, abductor tendinosis/tears, and calcific tendonitis
- Should generally be the first imaging technique after radiographs for suspected soft tissue pathology 1
- Does not require IV contrast in most cases
Ultrasound is an Excellent Alternative
- Targeted imaging specifically recommended for abductor tendinosis/trochanteric bursitis 1
- Can detect tendon matrix changes, calcium deposits, bursal distension, and tears 3
- Allows real-time dynamic assessment
- Useful for guiding diagnostic/therapeutic injections
- No radiation exposure
Clinical Pitfall
The common mistake is ordering CT when soft tissue pathology is suspected simply because it's a "cross-sectional" study. CT excels at bone detail but fails at soft tissue characterization. In the context of lateral hip pain with normal radiographs, proceeding to CT wastes time, exposes patients to radiation, and will likely require repeat imaging with MRI or ultrasound anyway.
Bottom Line
For suspected trochanteric bursitis, iliopsoas tendinitis, or abductor tendon pathology with normal radiographs, skip CT entirely and proceed directly to MRI or ultrasound 1. Ultrasound is particularly efficient if you have a specific clinical suspicion of abductor tendon or bursal pathology 1, 3.