Morel-Lavallée lesion associated with pelvic trauma is best described as:

• A An avascular necrosis of the femoral head following acetabular fracture-dislocation
• B Haemorrhagic destruction of the sacroiliac joint with chronic low back pain
• C A closed degloving injury with seroma/haematoma between the deep fascia and subcutaneous tissue over the greater trochanter or pelvis ✓
• D Avulsion fracture of the ischial tuberosity

Explanation

A Morel-Lavallée lesion is a post-traumatic closed degloving injury caused by shear forces separating the hypodermis from the deep fascia, creating a potential space filled with haemolymphatic fluid, fat necrosis, and debris. It most commonly occurs over the greater trochanter and lateral thigh in pelvic/acetabular trauma. If unrecognised before surgery, it significantly increases wound complication and deep infection rates. Treatment: percutaneous drainage/sclerotherapy for small lesions; open debridement for large or chronic cavities.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.