DOS Kongressen 2014 ·
169
Clinical correlation of the SRS-Schwab
Classification with HRQOL measures in a
prospective non-US cohort of ASD patients
Dennis Hallager Nielsen, Lars Valentin Hansen, Casper Rokkjær Dragsted,
Martin Gehrchen, Benny Dahl
Dept. of Orthopaedic Surgery, Rigshospitalet
Background:
The SRS-Schwab adult spinal deformity (ASD) classification sys-
tem is considered an important communication tool for spine surgeons as it sum-
marizes the complex pathology of ASD in four coronal curve types with three
sagittal modifiers (PI-LL, PT and SVA). The cut-off values separating level 0
from + have been proposed to predict severe disability defined by an Oswestry
Disability Index (ODI) of more than 40. The clinical correlations of the classifica-
tion system have only been evaluated using US ASD patients.
Purpose / Aim of Study:
The aim of the present study was to assess the
clinical correlations of the sagittal modifiers with various HRQOL measures in a
prospective, consecutive non-US cohort of ASD patients.
Materials and Methods:
Between March and August 2013 a total of 112 ASD
patients aged >18 years having sufficient long standing X-rays taken at our
out-patient clinic completed VAS scores for back pain, ODI, SRS22r, EQ5D and
SF36 questionnaires. 14 patients were excluded due to predefined criteria. For
each sagittal modifier the variation of score means/ranks across levels 0, + and
++ was assessed with one-way ANOVA/Kruskal-Wallis test.
Findings / Results:
98 patients were included with a median age of 64 years
(range 18-85). 64% were female, and 49% had a history of previous deformity
surgery. We found a significant variation for SF36 physical component sum-
mary (PCS) scores across the levels of all modifiers. Significant variation was
also found for SRS22r total score across PI-LL and PT levels, EQ5D and VAS for
back pain across PI-LL and SVA levels and ODI across SVA levels.
Conclusions:
We showed that the SRS-Schwab classification modifiers are able
to classify patients according to the SF36 PCS and various other HRQOL mea-
sures in a non-US cohort of ASD patients.
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