J Korean Orthop Assoc.  2004 Oct;39(6):629-635.

Analysis of Correction Loss after Pedicle Subtraction Osteotomy in Patients with Sagittal Imbalance: Radiologic Aspects

• Kim WJ
• Kang JW
• Kim KH
• Park KY
• Jung YH
• Jeong HJ
• Choy WS

Abstract

PURPOSE
To validate the surgical principles by analyzing the cause of a correction loss after pedicle subtraction osteotomy in patients with a sagittal imbalance in the radiological aspects, retrospectively. MATERIALS AND METHODS: Forty cases were analyzed radiographycally according to the presence (Group A) or absence (Group B) of the lower mobile segment and anterior column support performed (Group A2) or not (Group A1), respectively. RESULTS: The overall correction loss of the total fused part appeared to increase in group A (p=0.025) and the degree of lordosis of the osteotomy site showed an almost zero correction loss in group A and B. No statistic difference of the correction loss of the upper segment of the osteotomy site between the two groups was found (p=0.138). The correction loss of the lower segment of osteotomy site increased statistically more in goup A (p=0.014). The correction loss in group A occurred more in the lower segment than in the upper segment and the correction loss of the lower segment in group A1 appeared to have a better correlation than group A2 (p=0.012). CONCLUSION: Correction loss occurs at the intervertebral disc of the mobile segment. It is considered desirable to have anterior column support to all lower segment of the osteotomy site, because the correction loss increases more in the lower segment than in the upper segment.

Keyword

Pedicle subtraction osteotomy; Correction loss; Anterior column support

MeSH Terms

Animals
Humans
Intervertebral Disc
Lordosis
Osteotomy*
Retrospective Studies