Molti casi di sciatalgie o cruralgie artrosiche, non discali, sono dovuti a restringimenti patologici dei recessi o dei forami. Le manifestazioni cliniche variano a seconda della causa, della sede, dell'estensione e dell'entità della stenosi.
Le stenosi del canale lombare possono essere presenti alla nascita o svilupparsi nel periodo evolutivo, in associazione ad altre anomalie scheletriche o in forma isolata, oppure possono essere la conseguenza di processi patologici acquisiti, soprattutto di tipo degenerativo-artrosico.
Le stenosi lombari sono classicamente divise in 3 gruppi a seconda della localizzazione anatomica nel canale centrale, nei recessi laterali o nei forami e possono interessare uno solo o tutti questi settori contemporaneamente.
La TC e la RM permettono un completo e preciso bilancio delle alterazioni ossee e delle parti molli in causa, con il contributo di ciascuna di esse alla stenosi ed alla sintomatologia.
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