Current Concepts of Contemporary Expandable Lumbar Interbody Fusion Cage Designs, Part 2: Feasibility Assessment of an Endplate Conforming Bidirectional Expandable Interbody Cage

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Figure 1
Illustration of procedure used to quantify implant deformation. (A) Alignment of coronal, axial, and sagittal planes according to the position of implant fiducials and creation of ellipses to find the center point of each marker. (B) Final placement of dimensional lines from which measurements were taken.
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Figure 2
Illustration of procedure used to quantify bone within graft window. (A) Original mask is created to select all bone. (B) Multiplanar reformatting (MPR) is aligned to match the orientation of the titanium shim of each device. (C) Mask is cropped based on the maximum dimension of the titanium shim to produce volumetric data. (D) Final mask showing bone within graft window.
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Figure 3
Representative examples of implant deformation showing mild (A, B), moderate (C, D), and pronounced (E, F) conformation to the disc space. (A, B) Anterior and posterior aspect of patient 1 left device showing 0.45-mm and 0-mm differences between medial and lateral height measurements. (C, D) Anterior and posterior aspect of patient 7 right device showing 1.71-mm and 0.75-mm differences between medial and lateral height measurements. (E, F) Anterior and posterior aspect of patient 2 left device showing 2.80-mm and 2.19-mm differences between medial and lateral height measurements.