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JournalofOrthopaedicSurgery2001,9(1):1–7 Natural history of lumbar disc hernia with radicular leg pain: Spontaneous MRI changes of the herniated mass and correlation with clinical outcome Eiichi Takada and Masaya Takahashi Department of Orthopaedic Surgery, Faculty of Medicine, University of Okayama, Okayama, Japan Kimio Shimada Department of Orthopaedic Surgery, Rousai Hospital, Okayama, Japan and the morphologic changes of the herniated mass were well correlated with the clinical outcome. ABSTRACT Key words: lumbar disc hernia, MRI , natural history A prospective sequential MRI study was done to investigate the morphologic changes of the lumbar disc hernia (LDH). We also studied the relationship between the MRI changes and the type of LDH and the clinical outcome. INTRODUCTION MRI was performed every 3 months from the onset for a maximum of 24 months in 42 patients with Lumbar disc hernia (LDH) is a common cause of low radicular leg pain and symptoms definitely diagnosed back pain and radicular leg pain. It is well known that as caused by LDH. The size of the herniated mass was the majority of LDH patients recover determined by the ratio of the anteroposterior diameter spontaneously.5,19,21 Since the advent of MRI, a of the spinal canal to the maximum diameter of the spontaneous decrease in the size of LDH masses has LDH mass on T2-weighted axial images. been reported. 1,6,11 Saal reported more than 50% The clinical outcome was evaluated as excellent, reduction in 82% of patients.20 Matsubara wrote about good, or poor depending on l