Morel–Lavallée lesion associated with pelvic/acetabular fractures is best described as:
- A Open fracture of the pelvis with visceral contamination
- B Avulsion of the greater trochanter with fluid tracking along the IT band
- C Closed degloving injury causing separation of subcutaneous fat from the deep fascia with accumulation of haematoma and lymph fluid ✓
- D Retroperitoneal abscess from bowel perforation
Correct answer: C. Closed degloving injury causing separation of subcutaneous fat from the deep fascia with accumulation of haematoma and lymph fluid
Explanation
A Morel–Lavallée lesion is a closed internal degloving injury in which shearing forces separate the hypodermis from the underlying deep fascia, creating a potential space filled with blood, lymph, and liquefied fat. It most commonly occurs over the greater trochanter and iliac crest in pelvic trauma. MRI is the gold-standard for diagnosis (T2-bright fluid collection). Failure to recognise and drain this lesion before ORIF risks deep wound infection and implant failure.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.