Prediction of long-term clinical outcome in patients with lumbar spinal stenosis
- 501 Downloads
The natural course of lumbar spinal stenosis (LSS) fluctuates and is not necessarily progressive. The aim of this study was to explore the predictors of clinical outcome in patients with LSS that might eventually help to optimise the therapeutic choices.
A group of 56 patients (27 men, 29 women, median age 55; range 31–72 years) with clinically symptomatic mild-to-moderate LSS were re-examined after a median period of 88 months and their clinical outcomes classified as satisfactory (34 patients, 60.7 % with stable or improved clinical status) or unsatisfactory (22 patients, 39.3 % for whom clinical status deteriorated). A wide range of demographical, clinical, imaging and electrophysiological entry parameters were evaluated as possible predictors of clinical outcome.
Unlike the demographical, clinical and imaging variables, certain electrophysiological parameters were significantly associated with unsatisfactory outcomes. There was a significantly higher prevalence of pluriradicular involvement detected by EMG in patients with unsatisfactory outcome than those with satisfactory outcome (68.2 vs. 32.3 %; p = 0.035). Patients with unsatisfactory outcome had more frequent bilateral abnormalities of the soleus H-reflex (50.0 vs. 14.7 %; p = 0.015) and lower mean H-reflex amplitude. Multivariate logistic regression proposed two variables as mutually independent predictors of unsatisfactory outcome: EMG signs of pluriradicular involvement (OR = 3.72) and averaged soleus H-reflex amplitude ≤2.8 mV (OR = 2.87).
Satisfactory outcomes were disclosed in about 61 % of the patients with mild-to-moderate LSS in a 7-year follow-up. Electrophysiological abnormalities, namely the presence of pluriradicular involvement and abnormalities of the soleus H-reflex, were predictive of deterioration of clinical status in these patients.
KeywordsLumbar spinal stenosis Electromyography Outcome Natural course Prognosis
Lumbar spinal stenosis
Oswestry disability index
Numerical rating scale
Magnetic resonance imaging
Receiver operating characteristic
- 2 .
- 7.Malmivaara A, Slätis P, Heliövaara M, Sainio P, Kinnunen H, Kankare J, Dalin-Hirvonen N, Seitsalo S, Herno A, Kortekangas P, Niinimäki T, Rönty H, Tallroth K, Turunen V, Knekt P, Härkänen T, Hurri H, Finnish Lumbar Spinal Research Group (2007) Surgical or nonoperative treatment for lumbar spinal stenosis? A randomized controlled trial. Spine 32:1–8PubMedCrossRefGoogle Scholar
- 16.Mičánková Adamová B, Voháňka S (2009) The results and contribution of electrophysiological examination in patients with lumbar spinal stenosis. Scr Med (Brno) 82(1):38–45Google Scholar
- 20.Adamova B, Bednarik J, Smardova L, Moravcova E, Chvatalova N, Prokes B, Kadanka Z (2000) The association between cervical and lumbar spinal canal stenosis (in Czech). Ces Slov Neurol Neurochir 5:261–267Google Scholar