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目的:高齢者の第4腰椎すべり症に対し棘間切除による低侵襲除圧術の2年以上成績を調査した.方法:対象はMeyerding分類Ⅰ度で椎間可動域20°以下あるいは後方開大5°以下の60歳以上のL4/5単椎間の腰椎変性すべり症で,本術式を施行し術後2年以上追跡した23(男11,女12)例であった.結果:臨床的に術後1年および最終観察時までJOAスコア,腰痛VASおよび腰痛関連ADLは維持されていた.画像的には立位腰椎前弯角,L4/5椎間可動域は術前後で有意な変化はなかったが,L4/5椎間板高および%slipの有意な変化がみられた.結論:今回の結果からは,60歳以上の高齢者で25%以下の軽度不安定性の第4腰椎変性すべり症では,棘間切除の除圧法により椎間板高低下に伴う前方すべりの進行を伴うものの,術後2年以上経過しても臨床的に症状の改善,維持が可能であることが示された.
Porpose:The aim of this study was to investigate the clinical symptoms and radiographic changes in patients above 60 years of ages who underwent less-invasive interlaminar decompression for lumbar degenerative spondylolisthesis.
Methods:In this study, 23 patients (men:11, women:12) with a mean age of 69.4 years were followed up for at least 2 years. Radiographic inclusion criteria were as follows:<25% slippage, < -20 degree flexion-extension motion, and a kyphotic angle of <5 degree in flexion at the L4/5 segment. Evaluation on the basis of the Japanese Orthopaedic Association score, Visual Analogue Scale, and Roland Morris Disability Questionnaire revealed that the clinical symptoms significantly improved postoperatively and maintained at 1-year and final follow-up.
Results:There was no significant difference between the preoperative and final follow-up values for the radiological lumbar lordotic angle in standing position and L4/5 segmental mobile angle. Intervertebral disc height was significantly decreased while the % slippage was significantly increased at L4/5 at the final follow-up.
Conclusions:We confirmed that,in the patients who underwent less-invasive lumber interlaminar decompression,the radiological anterior slippage was greater while the disc height was smaller than usually observed in the patients who underwent decompression by the conventional method;however,these radiological changes may have no influence on the clinical symptoms.
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