Rates of adverse events after cervical arthroplasty mirror those of arthrodesis. Different patterns of adverse events occur including those related to any prosthetic devices such as subsidence, heterotrophic ossification, dislodgement, malposition, and infection. The use of proper indications, preoperative planning, and meticulous techniques can avoid the majority of these complications. Sizing and exact placement in the correct mechanical axis is essential and requires accurate biplanar fluoroscopic imaging. Further, spinal related events include clinical failure related to inadequate foramenal decompression and spinal cord injury. Compared with arthrodesis where residual foramenal stenosis may be tolerated, maintenance of motion by arthroplasty may cause loading in the uncus with further hypertrophy and persistent or recurrent symptoms. This is best prevented by assuring wide foramenal decompression at the time of arthroplasty. Spinal cord injury during implantation has not been reported. Wear of the bearing surfaces and formation of debris particles can cause loosening and prosthetic failure. This has not been reported as yet after cervical arthroplasty due to the relatively short time of follow-up for most devices. Two notable cases of apparent metal hypersensitivity causing formation of a pseudotumor have been seen after placement of a metal on metal cobalt-chrome prosthesis. The treatment of malpositioned or hardware-related events is by removal and arthrodesis usually not requiring corpectomy and fusion of other levels. Radiculopathy from foramenal stenosis at the index level site can be resolved with posterior microforamenotomy.
*Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, MO
†Nevada Neurosurgery, Reno, NV
§Spine Institute of Louisiana, Shreveport, LA
∥Department of Orthopaedic Surgery, Emory University, Atlanta, GA
¶Department of Orthopaedic Surgery and Rehabilitation, University of Wisconsin, Madison, WI
♯Indiana Spine Group, Indianapolis, IN
**Oregon Neurosurgery Specialists, Eugene, OR
‡Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea
Disclosures: Jacob M. Buchowski, MD, MS, Speakers bureau (Stryker) and Paid consultant (Stryker). Lali H. S. Sekhon, MD, Paid consultant (Medtronic, NuVasive) and Stock or Stock Options (Phygen, Kinetic Spine Technologies). Do-Heum Yoon, MD, None. Pierce D. Nunley, MD, Royalties (Biomet, LDR Spine, Osprey); Speakers bureau (NuVasive, K2M, TranS1); Paid consultant (NuVasive, K2M, TranS1); Research support (Biomet); and Stock or Stock options (K2M, Paradigm Spine, Amedica, Spineology). John G. Heller, MD, Royalties (Medtronic); Speakers bureau (Abbott, Medtronic); Paid consultant (Abbott, Medtronic); Unpaid consultant (BioCure); Research support (Abbott, Medtronic, Synthes); and Stock or Stock Options (Medtronic). Paul A. Anderson, MD, Royalties (Pioneer, Stryker); Paid consultant (Aesculap/B. Braun, Expanding Orthopedics, Medtronic, Spertec, Titan Surgical); and Stock or Stock Options (Pioneer, Spartec, Titan Surgical). Rick C. Sasso, MD, Royalties (Medtronic); Research support (Medtronic, Stryker, Smith and Nephew, AO Foundation, Cerapedics, and Lilly); and Stock or Stock options (Biomet). Robert J. Hacker, MD, None. K. Daniel Riew, MD, Royalties (Biomet, Medtronic, Osprey); Paid consultant (Biomet); Unpaid consultant (Synthes); Research support (Medtronic—terminated July 2009); and Stock or Stock options (Osprey, SpineMedica, Amedica, Expanding Orthopedics, Spineology, Spinal Kinetics, Nexgen Spine, Vertiflex, Benvenue, Paradigm Spine, PSD).
Address correspondence and reprint requests to Jacob M. Buchowski, MD, MS, Department of Orthopaedic Surgery, Washington University in St. Louis, 660 S. Euclid Ave., Campus Box 8233, St. Louis, MO 63110. E-mail: email@example.com