Long-term results of double-door laminoplasty using hydroxyapatite spacers in patients with compressive cervical myelopathy |
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Authors: | Atsushi Kimura Atsushi Seichi Hirokazu Inoue Yuichi Hoshino |
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Institution: | (1) Department of Orthopaedics, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke Tochigi, 329-0498, Japan |
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Abstract: | No previous studies have reported 10-year follow-up results for double-door laminoplasty using hydroxyapatite (HA) spacers.
The purpose of this study was therefore to explore the long-term results of double-door laminoplasty using HA spacers and
to determine if non-union or breakage of HA spacers is related to restenosis of the enlarged cervical canal. The study group
consisted of 68 patients with a minimum of 10 years of follow-up after double-door laminoplasty using HA spacers. The average
postoperative Japanese Orthopaedic Association score improved significantly after surgery and was maintained until the final
follow-up. The average range of motion decreased by 42.6% in patients with cervical spondylotic myelopathy (CSM) and 65.8%
in patients with ossification of the posterior longitudinal ligament (OPLL). The enlarged cervical canal area was preserved
almost until the final follow-up. The average non-union rates of HA spacers were 21% in CSM and 17% in OPLL, and the average
breakage rates were 24 in CSM and 21% in OPLL at the final follow-up. Although non-union and breakage of HA spacers were common,
neither of these factors were correlated with restenosis of the enlarged cervical canal. |
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Keywords: | Cervical myelopathy Double-door laminoplasty Hydroxyapatite spacer Long-term outcome |
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