Postoperative diskitis: distinguishing early MR imaging findings from normal postoperative disk space changes.

Area of Science:

• Radiology
• Orthopedics
• Infectious Disease

Background:

• Postoperative changes after lumbar diskectomy can mimic early diskitis on MR imaging.
• Accurate differentiation is crucial for appropriate patient management and treatment.

Purpose of the Study:

• To identify distinct early magnetic resonance (MR) imaging findings differentiating postoperative diskitis from normal postoperative changes.
• To evaluate the utility of gadolinium enhancement in distinguishing these conditions.

Main Methods:

• A prospective study compared MR imaging findings in 15 asymptomatic patients post-lumbar diskectomy with 7 patients diagnosed with postoperative diskitis.
• Analysis focused on gadolinium enhancement patterns in vertebral bone marrow, disk space, and posterior anulus fibrosus.

Main Results:

• Gadolinium enhancement patterns varied between diskitis and asymptomatic groups.
• Vertebral bone marrow enhancement was seen in all diskitis patients vs. one asymptomatic patient.
• A triad of findings (vertebral bone marrow, disk space, and posterior anulus fibrosus enhancement) was specific for diskitis and absent in asymptomatic patients.

Conclusions:

• Gadolinium-enhanced MR imaging is valuable for distinguishing early postoperative diskitis from normal postoperative changes.
• Specific enhancement patterns, particularly the triad of findings, are highly suggestive of diskitis.
• Disk space and adjacent bone marrow changes post-diskectomy warrant careful evaluation for early diskitis.