(来学网)腰椎椎管狭窄时,腰椎椎管前后径应小于 ( )
  • A.
    (来学网)10mm
  • B.
    (来学网)12mm
  • C.
    (来学网)13mm
  • D.
    (来学网)15mm
  • E.
    (来学网)16mm