Navigated Transtubular Extraforaminal Decompression of the L5 Nerve Root at the Lumbosacral Junction: Clinical Data, Radiographic Features, and Outcome Analysis

Table 2

Summary of the radiographic measurements of the intertransversal space at the L4/5 and L5/S1 level as well as of the optimal angle of approach at the axial level.

	Mean	Min	Max	SD
Intertransversal space L4/5^†	21.6	16.2	25.4	2.8
Intertransversal space L5/S1^†	10.5	3	15.4	3.9
Angle of approach	21°	14°	26°	21

Interrater reliability = 0,71 indicating substantial agreement between the two raters (P. Stavrinou and C. Kabbasch).
^†Measurements in millimeter (mm).