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ABSTRACT: Comparison of 2 radiographic scoliosis classification systems by multiple surgeons.
Compare the reliability of Peking Union Medical College (PUMC) and Lenke scoliosis classification systems and analyze their differences.
The PUMC classification is a newly reported system based on radiographic measurements with recent popularity, while the Lenke classification is widely accepted worldwide in surgical design. Both these classification systems have their own individual characteristics, hence it is necessary to compare their reliability.
Five scoliosis surgeons independently evaluated and classified presurgical radiographs of 62 adolescent idiopathic scoliosis patients based on the PUMC and Lenke classification systems on 2 separate occasions. Radiographs were cleaned before each evaluation. Inter- and intraobserver reliabilities were quantified using Kappa statistics. Data were compared using chi2 analysis.
The PUMC classification's inter- and intraobserver percentage of agreement averaged to 91.0% (Kappa coefficient 0.896) and 90.2% (Kappa coefficient 0.892), respectively. While those of the Lenke curve type classification were 86.5% (Kappa coefficient 0.808) and 87.4% (Kappa coefficient 0.826). The PUMC classification from 10 individual measurements had 17 cases (27.4%) of disagreements, while in the Lenke curve type classification, 24 cases (38.7%) had disagreements. PUMC classification normally has discrepancies between type IIb, IIc, and IId, while Lenke classification has discrepancies in curve types 1 and 2. Out of 17 inconsistent PUMC curve type cases, 7 did not affect surgical fusion levels, while in the Lenke's only 2 out of 24 cases with discrepancies did not affect fusion range selection, with an obvious statistical difference.
The reliability of both PUMC classification and Lenke curve type classification were categorized as good-to-excellent. PUMC classification is relatively simple, with less confusion among inter- and intraobservers, with corresponding surgical fusion guidance and planning. The mismatch of curve classification had less influence on PUMC's fusion range selection than Lenke's.
Spine 11/2008; 33(22):E836-42. · 2.16 Impact Factor
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ABSTRACT: A prospective study.
Comparison study of radiologic and clinical outcomes, efficiency, and cost between anterior spinal fusion (ASF) and posterior spine fusion (PSF) in surgical treatment of moderate lumbar/thoracolumbar adolescent idiopathic scoliosis (AIS).
ASF and PSF indicated for lumbar and thoracolumbar adolescent idiopathic scoliosis surgical treatment have respective advantages and disadvantages. However, up until today, a related prospective AIS comparative study has rarely been reported.
Thirty-two cases in this prospective study with patients enrolled in either method A or B alternately in a sequence were divided into 2 groups. Group A underwent ASF with single solid rod and single screw constructs, and group B underwent PSF with segmental total pedicle screw system. Inclusion criteria were: (1) AIS diagnosis; (2) diagnosis classification as Lenke5CN type; (3) Cobb angles 35 degrees-60 degrees on anteroposterior view radiographs. Exclusion criteria were: (1) a history of spinal surgery; (2) age younger than 10 years; (3) Risser sign 0 degree; (4) lumbar/thoracolumbar kyphosis. All patients were observed with 2-year minimum follow-up (24-46 months). Clinical and radiologic outcomes of both groups A and B were analyzed.
Statistical t test or Mann-Whitney U test demonstrated no significant difference in preoperative age (P = 0.380), Risser sign (P = 0.733), magnitude (P = 0.936), flexibility (P = 0.815), apical vertebra rotation (AVR, P = 0.756), and apical vertebra translation (AVT, P = 0.355) of the lumbar/thoracolumbar curves, trunk shift (TS, P = 0.448), sagittal kyphosis from T5-T12 (P = 0.792) and sagittal lordosis from L1-L5 (P = 0.299). Average coronal correction of thoracolumbar/lumbar curves was 83% after surgery and 77% at follow-up in group A and 87% after surgery and 82% at follow-up in group B (P = 0.236 and P = 0.138). No significant differences were observed regarding correction of sagittal alignment, TS, AVT, AVR and hospitalization days on last follow-up between both groups (P > 0.05). No pseudarthrosis, reoperation, neurologic complications, infection, and no other problems were observed. Excellent clinical fusion results were present in all patients on their last follow-up. However, significant differences were evident in group A in regards to reduced operative time (P = 0.046), reduced estimated blood loss (P = 0.003), decreased blood transfusion (P = 0.006), reduced implants cost and hospitalization expenses (P = 0.000). Additionally, group A had shorter fusion levels than group B (p50 = 4 vs. p50 = 5, P = 0.003).
ASF versus PSF comparison in treating moderate lumbar/thoracolumbar AIS did not show significant differences in regards to safety or efficacy but demonstrated shorter fusion levels, reduced surgical trauma and costs in ASF.
Spine 10/2008; 33(20):2166-72. · 2.16 Impact Factor
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ABSTRACT: To evaluate the orthopedic effects of internal fixation of cervical pedicle screw on cervical spondylotic myelopathy with cervical kyphosis.
Seventeen patients with cervical spondylotic myelopathy with cervical kyphosis with the Cobb's angle >10 degrees underwent internal fixation of cervical pedicle screw. The patients were followed up for 13. 8 months. The Cobb's angle of cervical kyphosis was measured before operation, one week after-operation, and upon the final follow up. The neural function and cervical spine stability were evaluated using Japanese Orthopedic Association (JOA) scoring system.
The average preoperative Cobb's angle of cervical kyphosis was -16.1 degrees before operation, was -3.3 degrees one week after operation, and was -3.8 degrees at the final follow-up. Follow-up 6 months after operation and at the final follow up showed that the fused segments were stable. The JOA score improved by 5.2 +/- 1.6 (P < 0.05) with a mean JOA score improvement rate of 64. 3%. No neurovascular and instrumentation-related complications occurred.
Internal fixation of cervical pedicle screw is effective and safe in treatment of cervical spondylotic myelopathy with cervical kyphosis.
Zhonghua yi xue za zhi 06/2008; 88(21):1454-7.