title: Heterotopic ossification associated with myelopathy following cervical disc prosthesis implantation.
abstract: This case report presents a 37-year-old man with clinical signs of myelopathy almost 9 years after implantation of a Bryan disc prosthesis (Medtronic Sofamor Danek, Memphis, TN, USA) for C5/C6 soft disc herniation. As demonstrated on MRI and CT scan, spinal cord compression was caused by bony spurs due to heterotopic ossification posterior to the still moving prosthesis. The device, as well as the ectopic bone deposits, had to be removed because of myelopathy and its imminent aggravation. Conversion to anterior spondylodesis was performed.
authors.affiliation: Neurosurgery, Klinik Beau-Site, and Salemspital, Schänzlihalde 11, 3000 Bern 25, Switzerland. Electronic address: aerzte.beau-site@hirslanden.ch.
authors.forename: Markus
authors.initials: M
authors.lastname: Wenger
authors.affiliation: Neurosurgeon FMH, Private Practice Spine Surgery, 3115 Bern-Gerzensee, Switzerland.
authors.forename: Thomas-Marc
authors.initials: TM
authors.lastname: Markwalder
mesh_terms: D000328:Adult; D002574:Cervical Vertebrae / Q000601:surgery; D006801:Humans; D007403:Intervertebral Disc / Q000601:surgery; D007405:Intervertebral Disc Displacement / Q000601:surgery; D007595:Joint Prosthesis / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D009999:Ossification, Heterotopic / Q000209:etiology*; D054850:Osteophyte / Q000209:etiology / Q000473:pathology; D013117:Spinal Cord Compression / Q000209:etiology; D013118:Spinal Cord Diseases / Q000209:etiology* / Q000601:surgery; D013123:Spinal Fusion; D014057:Tomography, X-Ray Computed; D059145:Total Disc Replacement / Q000009:adverse effects*
keywords: Bryan prosthesis; Cervical spine; Heterotopic ossification; Myelopathy; Prosthesis removal; Spondylodesis