Does an MRI of One Hip Include the Groin Region?
Yes, an MRI of the hip typically includes the groin region on that side, as standard hip MRI protocols are ordered as "MRI pelvis and affected hip" which encompasses both the hip joint and surrounding pelvic/groin structures. 1
Standard MRI Hip Protocol Coverage
The ACR Appropriateness Criteria consistently refer to hip MRI as "MRI Pelvis and Affected Hip" rather than just "MRI Hip" alone 1. This nomenclature reflects that the standard imaging field of view includes:
- The hip joint itself (femoral head, acetabulum, labrum)
- The pelvis (including pubic rami, sacrum, ischium)
- The groin soft tissues (adductor tendons, iliopsoas, rectus abdominis)
- Proximal femur
Clinical Rationale for Inclusive Coverage
The groin region must be included because patients with hip pain frequently have concomitant pelvic and groin pathology. The ACR guidelines explicitly state that "patients with clinically suspected proximal femur fracture often have fractures of the pelvis, including the sacrum and pubic rami" 1. This principle extends beyond fractures to all hip pathology.
Key Anatomical Considerations
MRI is specifically valuable for evaluating groin-related structures that cause hip/groin pain 2:
- Pubic symphysis and pubic rami (75-85% of athletes show pubic findings on MRI) 3
- Adductor longus and rectus abdominis aponeurosis (athletic pubalgia/sports hernia)
- Iliopsoas tendon and bursa
- Rectus femoris origin
- Hamstring attachments
Practical Imaging Protocol
When ordering an MRI for hip evaluation, the standard protocol automatically includes the groin because:
- Field of view extends from iliac crests to mid-femoral shaft - this inherently captures all groin structures
- Coronal sequences visualize the entire pelvis - showing bilateral pubic rami, adductor origins, and symphysis
- Axial sequences through the hip - include anterior groin musculature and posterior structures
Common Pitfall to Avoid
Do not order "MRI hip" expecting only the joint itself - this may result in inadequate coverage. Instead, ensure the order specifies "MRI pelvis and hip" or communicate with radiology that groin evaluation is needed if there's concern about limited protocols at your institution.
When Groin Coverage is Especially Critical
The groin region evaluation becomes particularly important when 2, 4, 5:
- Pain is poorly localized between hip and groin
- Athletic patients with activity-related pain (soccer, hockey, running)
- Suspected athletic pubalgia or sports hernia
- Adductor or iliopsoas pathology is considered
- Negative radiographs but persistent symptoms
MRI demonstrates 96.7% of symptomatic and 95.6% of asymptomatic athletes have at least one finding in the hip/groin region, with pubic (75-85%), labral (70-78%), and chondral (54-60%) findings most common 3. This high prevalence of findings emphasizes why comprehensive imaging including the groin is standard practice.