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Koga et al. Minimal laminectomy with the interlaminar approach for PELD

Removed width of SAP (mm) 3 4 4 3 3 1 2 3

Area of bone removal CM-UVL CM-UVL CM-UVL SAP, CM- LVL CM-UVL SAP, IAP SAP SAP, IAP SAP, IAP SAP CM-LVL SAP, CM- LVL SAP, CM- LVL

Mainly used instrument Drill Kerrison Drill Kerrison Kerrison Drill Kerrison Drill Drill Kerrison Kerrison Drill Kerrison

Grade of caudal migration‡ Low Low (-) Low Low (-) Low (-) (-) (-) High High Low

Concave of upper vertebral laminae† (-) (+) (-) (-) (-) (+) (-) (-) (+) (-) (+) (-) (+)

Width of interlaminal space (mm) 20 27 27 19 23 17 20 26 19 23 27 19 25

AP size ratio (MRI) 0.47 0.41 0.5 0.48 0.53 0.43 0.47 0.4 0.41 0.19 0.53 0.6 0.29 The boldfaced type in columns indicates the main reason for minimal laminectomy. *(+) Indicates recurrent lumbar disc herniation (LDH) case and (-) indicates fresh LDH cases; †(+) indicates LDH case with concave of upper vertebral laminae and (-) indicates LDH case without the concave; ‡(-) indicates LDH case revealed no caudal migration. BMI: body mass in

Table 2: Summary of the detailed features of the 13 cases with laminectomy
Type of MRI Ventral Ventral Ventral Ventral Ventral Ventral Shoulder Ventral Ventral Ventral Axilla Axilla Ventral

Recurrence* (+) (-) (-) (-) (+) (-) (-) (-) (-) (-) (-) (-) (-) and caudal directions and evacuated the LDH via the axilla without traction of the nerve root [Figure 4].

R/L L L L L R L L R R R L L R
Location Level L5/S1 L5/S1 L4/5 L5/S1 L5/S1 L5/S1 L5/S1 L5/S1 L5/S1 L5/S1 L5/S1 L4/5 L5/S1 and obtained useful information for selecting laminectomy with the ILA.

BMI 23.1 39.4 23.5 21.2 24.4 25.7 20.3 27.3 16.9 20.9 26.3 27.3 27.5

Gender F M M M M M M M M F M M M cephalic margin of the lower vertebral laminae

Age (years) 43 40 82 37 34 17 41 53 31 50 74 57 43 DISCUSSION

Case No. 1 2 3 4 5 6 7 8 9 10 11 12 13

60 Mini-invasive Surgery ¦ Volume 1 ¦ June 30, 2017