Article Figures & Data
Figures
- Figure 1
Motion segment with lamina removed. (A) Posterior view of functional posterior longitudinal ligament (fPLL); includes thickened posterior annulus fibrosis and posterior longitudinal ligament. (B) Posterior to anterior view. (C) Anterior to posterior view.
- Figure 2
Test protocol. Flexion-extension, lateral bending, and axial rotation tests (± 1.5 Nm) were performed at all protocol steps. Abbreviations: PLL, posterior longitudinal ligament; fPLL, functional PLL.
- Figure 3
Technique to resect functional posterior longitudinal ligament (PLL) without prosthesis removal. (A) Needle insertion. (B) Wire inserted through ligamentum flavum, looped around functional PLL (fPLL), and passed back through needle. (C) Wire around PLL with total disc arthroplasty in place. (D) After PLL is cut. (E) Posttest confirmation of PLL resection.
- Figure 4
Flexion-extension (FE) load displacement of C5-C6 (A) and C6-C7 (B) segments at all protocol steps demonstrating range of motion (ROM) and segmental stiffness. Abbreviations: TDA, total disc arthroplasty; PLL, posterior longitudinal ligament.
- Figure 5
(A) C5-C6 and C6-C7 anterior and posterior disc heights for all protocol steps. (B) C5-C6 and C6-C7 segmental wedge angles for all protocol steps. *P ≤ .05, **P ≤ .01). Abbreviations: TDA, total disc arthroplasty; PLL, posterior longitudinal ligament.
- Figure 6
Range of motion (ROM) for all protocol steps: (A) C5-C6 ROM in flexion-extension (FE), lateral bending (LB), and axial rotation (AR) tests. (B) C6-C7 ROM in FE, LB, and AR tests. (C) C5-C6 ROM in flexion and extension. (D) C6-C7 ROM in flexion and extension. *P ≤ .05, **P ≤ .01. Abbreviations: TDA, total disc arthroplasty; PLL, posterior longitudinal ligament.
- Figure 7
(A) Flexion stiffness of C5-C6 and C6-C7 for relevant protocol steps. (B) C5-C7 flexion-extension range of motion (ROM) of intact, 1-level total disc arthroplasty (TDA) (posterior longitudinal ligament [PLL] resection) and 2-level TDA (PLL resection). *P ≤ .05, **P ≤ .01.
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