Gyroscan nt intera 1.5 t

The operative time required for the anterior procedure, intraoperative blood loss, and clinical outcome were investigated. Clinical outcome was evaluated using the Japanese Orthopaedic Association (JOA) score, and visual analog scales 5,8,10 for low-back pain, gluteal and lower limb pain, and gluteal and lower limb numbness.
Lumbar MRI (Philips Gyroscan NT Intera 1.5 T) was performed before surgery. Using axial T2-weighted MR images obtained at the central level of the intervertebral disc, the distance (P) between the posterior margin of the intervertebral disc and posterior border of the psoas major muscle was divided by the anteroposterior diameter (D) of the intervertebral disc to calculate the psoas position (PP%): PP% = P/D × 100 (Fig. 3). Cases in which the posterior border of the psoas major muscle went over the center of the intervertebral disc (PP% ≥ 50%) were defined as rising psoas sign-positive. Patients were divided into those with pre-dissection thresholds measured using the dilator electrode of ≤ 10 mA and > 10 mA. 19 Femoral pain/ numbness and muscle weakness on the approach side that continued for 1 week or longer after surgery were regarded as neurological complications induced by the approach. The correlation between the duration of these neurological symptoms and PP% was investigated.