Lumbar Spine Bone MRI: A Radiation-Free Approach Utilizing CT-Like Imaging for Diagnosing Pars Defects in the...

Area of Science:

• Radiology
• Orthopedics
• Medical Imaging

Background:

• Lumbar spondylolysis is a common cause of low back pain in adolescents.
• Computed tomography (CT) is often used to diagnose pars defects but involves ionizing radiation.
• There is a need for nonionizing imaging techniques to assess pars defects.

Purpose of the Study:

• To evaluate the quality of a synthetic bone MRI protocol using spoiled gradient recalled echo (SPGRE).
• To determine the utility of the SPGRE sequence in detecting lumbar pars defects in adolescent patients.
• To assess the usability of this MRI protocol for orthopedic surgeons and radiologists.

Main Methods:

• Retrospective cohort study of 30 adolescent patients with lumbar spondylolysis.
• Lumbar spine MRI at 3T including a 3D SPGRE sequence.
• Comparison with CT in 5 patients; image analysis by an orthopedic surgeon and radiologist using a Likert scale and interreader agreement calculation.

Main Results:

• Pars defects were identified in all 30 patients on SPGRE MRI.
• Excellent image quality was achieved (average score 4.53 ± 0.60).
• Substantial interrater agreement (Gwet AC2 = 0.79) was observed between the orthopedic surgeon and radiologist.

Conclusions:

• The synthetic bone MRI protocol using SPGRE is a viable nonionizing alternative to CT for diagnosing pars defects.
• The SPGRE sequence provides sufficient image quality for effective assessment by clinicians.
• This MRI protocol can aid orthopedic surgeons and radiologists in managing adolescent back pain.