Article Figures & Data
Figures
- Fig. 1
Anteroposterior and lateral views of prosthesis (XL-TDR).
- Fig. 2
Case example of 2-level lumbar arthroplasty showing dynamic X-rays at 36-month follow-up.
- Fig. 3
Clinical outcomes up to 36 months. Postoperative scores were statistically significantly better (P .05). (ODI, Oswestry Disability Index; VAS, visual analog scale.)
- Fig. 4
Case example of lateral disc revision showing 24-month follow-up images (top) and post-XLIF images (bottom).
- Fig. 5
Case example of grade IV heterotopic ossification. Contralateral bone formation is shown by the arrow. Fusion at the index level is evidenced by the dynamic X-rays.
Tables
- Table 1
A selective (non-comprehensive) list of some of the more relevant inclusion/exclusion criteria for the study
Inclusion criteria Age 18–60 y Symptomatic lumbar degenerative disease: magnetic resonance imaging–confirmed disc desiccation, loss of disc height, and bridging osteophytes Symptomatic level L1-2, L2-3, L3-4, or L4-5 Preoperative Oswestry Disability Index score ≥ 30 points Unresponsive to conservative treatment for > 6 mo or presence of progressive neurologic symptoms Willing and able to comply with requirements defined in protocol for duration of study Signed and dated informed consent form Exclusion criteria Prior lumbar fusion surgery at operative level Prior lumbar laminectomy at operative level Prior complete lumbar facetectomy at operative level Prior bilateral retroperitoneal surgery Radiographic signs of significant instability at operative level (> 3-mm translation, > 11° angulation different from adjacent level) Bridging osteophytes or absence of motion < 2° Radiographic confirmation of significant facet joint disease or degeneration Pars defect, facet abnormality, or other compromise of posterior elements Spondylolisthesis (greater than grade 1) Osteopenia, osteoporosis, or osteomalacia to a degree that spinal instrumentation would be contraindicated Body mass index > 40 Active local or systemic infection, including AIDS and hepatitis
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