Laminectomy: effects on postoperative technetium and gallium scintigraphy

Area of Science:

• Nuclear Medicine
• Surgical Oncology
• Orthopedic Surgery

Background:

• Laminectomy is a common spinal surgery.
• Postoperative complications can occur, including infection.
• Accurate diagnostic tools are crucial for early detection.

Purpose of the Study:

• To evaluate the utility of Technetium-99m diphosphonate (Tc-99m) bone scans in detecting postoperative changes after laminectomy.
• To compare the sensitivity of Tc-99m bone scans with Gallium-67 citrate (Ga-67) scans in identifying postoperative complications.

Main Methods:

• Patients undergoing laminectomy were assessed using Tc-99m diphosphonate bone scans within two weeks postoperatively.
• Scans were analyzed for abnormal uptake, and findings were compared to preoperative scans and clinical outcomes.
• A subset of patients also underwent Ga-67 citrate scanning for comparison.

Main Results:

• Tc-99m bone scans showed abnormalities in less than half of patients post-laminectomy, irrespective of surgical extent.
• Significant new uptake on Tc-99m scans, comparable to sacroiliac joints, was rare in patients with normal preoperative scans.
• Ga-67 citrate scans demonstrated abnormality in 89% of patients postoperatively, indicating higher sensitivity.

Conclusions:

• Tc-99m diphosphonate bone scans have limited sensitivity for detecting postoperative changes after laminectomy.
• Ga-67 citrate scans appear more effective in identifying postoperative complications, potentially aiding in the diagnosis of infection.