title: Performance of Cervical Arthroplasty at a Pseudarthrosed Level of a MultiLevel Anterior Cervical Discectomy and Fusion: Case Report.
abstract: To present a conversion from an anterior cervical discectomy and fusion (ACDF) to cervical arthroplasty in a 40-year-old, active duty member and perform a review of the literature.
  
  
  
  A helicopter pilot in the U.S. Army underwent a three-level ACDF in 2010 at a nonmilitary institution for symptoms of bilateral upper-extremity radiculopathy. His symptoms resolved; however, per regulations, he was grounded. The patient recently presented at our clinic for evaluation of axial neck and intrascapular pain with radiographic evaluation revealing pseudarthrosis at C6-7 with segmental motion without facet joint degeneration. Surgery was performed to remove the existing allograft and replace it with an artificial disc, thus restoring a motion segment.
  
  
  
  Postoperative imaging reveals appropriate placement of the artificial disc and range of motion at C6-7 with the patient reporting improvement in neck pain. He has since been granted a waiver to return to active flight status.
  
  
  
  Revision of ACDF to arthroplasty is an exceedingly rare procedure with only two cases reported in the literature. Here, the authors demonstrate use of the procedure for a military career-specific application. When facet joint degeneration or ankylosis is absent, restoration of motion can successfully, and safely, be achieved.
authors.affiliation: Department of Neurosurgery, Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, MD 20889.
authors.forename: Joseph
authors.initials: J
authors.lastname: Spinelli
authors.affiliation: Department of Neurosurgery, Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, MD 20889.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Neal
authors.affiliation: Department of Neurosurgery, Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, MD 20889.
authors.forename: Michael K
authors.initials: MK
authors.lastname: Rosner
mesh_terms: D000328:Adult; D000401:Aircraft; D001168:Arthritis / Q000150:complications / Q000209:etiology; D001178:Arthroplasty / Q000379:methods / Q000592:standards*; D002574:Cervical Vertebrae / Q000002:abnormalities / Q000601:surgery*; D017586:Diskectomy / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008889:Military Personnel; D009333:Neck / Q000601:surgery; D019547:Neck Pain / Q000209:etiology; D000070356:Pilots; D011843:Radiculopathy / Q000601:surgery; D013123:Spinal Fusion / Q000009:adverse effects