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KMID : 1040920210060020090
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Journal of Minimally Invasive Spine Surgery and Technique
2021 Volume.6 No. 2 p.90 ~ p.97
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MRI Study to Evaluate Anatomic Oblique Lumbar Interbody Fusion Corridor in Indian Population
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Gajjar Sharvil
Jhala Amit Chandrakant
Kiri Shivam
Mistry Manish
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Abstract
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Objective: The anatomic corridor is defined by different studies in the western population but the exact corridor for the Indian population is never been studied. Objective of the study was to define anatomical corridor for preoperative assessment of Oblique Lumbar Interbody Fusion (OLIF) in the Indian population.
Methods: We selected imaging data from 180 adults (90 males and 90 females) who underwent MRI. The windows studied at L1-2 to L4-5 levels were vascular window, bare window, psoas major window, and operative window. The bare window was further analysed by dividing it into three groups. Group 1 with no window, group 2 with 0 to 5 mm window, and group 3 with more than 5 mm. Statistical analysis was carried out by unpaired t-test.
Results: The bare window was largest at L1-2 (1.29 ± 0.53 cm) and smallest at L4-5 (0.79 ± 0.52 cm). The psoas major window was largest at L3-4 (1.24±0.38 cm) and smallest at L1-2 (0.45±0.47 cm). The operative window was largest at L3-4 (2.4±0.47 cm) and smallest at L4-5 (1.72 ± 0.67 cm). In 10.56% of patients at L4-5, there was no bare window and OLIF cannot be performed in these patients.
Conclusion: Bare window gradually decreases from L12 to L45 levels. In the majority of patients at L12, L23, and L34 there is adequate bare window and OLIF can be safely performed. In 10.56% of patients, the bare window for performing OLIF does not exist at L45 and OLIF may not be feasible in these patients.
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KEYWORD
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Oblique lumbar interbody fusion, Oblique corridor, Bare window, Anatomical corridor
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