title: Follow-up study on the motion range after treatment of degenerative disc disease with the Bryan cervical disc prosthesis.
abstract: This study examined effect of a new intervertebral cervical disc prosthesis in relieving the neurological symptoms and signs, improving the patients' ability to perform daily activities, reducing pain, and maintaining the stability and segmental motion. From December 2003 to October 2004, 12 patients, who had received 14 replacements of cervical artificial discs, were followed-up for 2 to 8 months (with a mean of 5.2 months). Of them 5 had cervical spondylotic myelopathy and 7 had cervical disc herniation. The patients included 7 males and 5 females, with their age ranging from 35 to 62 y and a mean of 50.3 y. Single-level replacements were performed in 10 cases and 2 cases received two-level replacement. Operation time of the single-level surgery averaged 130+/-50 min and the time of two-level surgery was 165+/-53 min on average (from skin incision to skin suturing). Neurological or vascular complications during or after surgery was not observed. Japanese Orthopedic Association scores (JOA scores) increased from 8.6 to 15.8 on average. There was no prothesis subsidence or excursion. Replaced segments were stable and the range of motion was partially restored, being 4.68 degrees (3.6 degrees -6.1 degrees ) in flexion and extension position and 3.51 degrees (2.5 degrees -4.6 degrees ), 3.42 degrees (2.6 degrees -4.3 degrees ) in left and right bending position. No obvious loss of physiological curvature was noted. CT or MRI follow-up showed that excursion was less than 1.5 mm) in 2 of 14 levels and between 1.5 mm and 3 mm) in 1 of 14 levels. No ossification in the replaced levels was observed. It is concluded that satisfactory short-term results were achieved in the 12 cases of artificial disc replacements. Different from anterior cervical discectomy and fusion, the replacement could achieve quick functional recovery and did not lead to the movement limitation of cervical vertebrae. At least a 5-years follow-up was needed to assess the long-term effect of the prosthesis on its neighboring segments.
authors.affiliation: Department of Orthopedics, Union Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China. huyong610@163.com
authors.forename: Shuhua
authors.initials: S
authors.lastname: Yang
authors.forename: Yong
authors.initials: Y
authors.lastname: Hu
authors.forename: Jijun
authors.initials: J
authors.lastname: Zhao
authors.forename: Xianfeng
authors.initials: X
authors.lastname: He
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Weihua
authors.initials: W
authors.lastname: Xu
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Du
authors.forename: Dehao
authors.initials: D
authors.lastname: Fu
mesh_terms: D019643:Arthroplasty, Replacement / Q000379:methods; D002574:Cervical Vertebrae / Q000601:surgery*; D019299:Decompression, Surgical / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007403:Intervertebral Disc / Q000601:surgery; D007405:Intervertebral Disc Displacement / Q000503:physiopathology* / Q000601:surgery*; D007595:Joint Prosthesis; D008297:Male; D011184:Postoperative Period; D019919:Prosthesis Implantation / Q000379:methods*; D016059:Range of Motion, Articular; D013118:Spinal Cord Diseases / Q000209:etiology / Q000601:surgery; D013128:Spinal Osteophytosis / Q000150:complications / Q000601:surgery