Cervical alignment and range of motion after single-level ProDisc-C replacement

English Keywords:Artificial disc replacement  ProDisc-C  Functional spinal unit angle  Cervical alignment  Cervical range of motion

English Abstract:

  【Abstract】 Objective：To investigate the cervical alignment and range of motion（ROM） after single-level ProDisc-C replacement.Method：53 patients underwent single-level anterior cervical decompression and ProDisc-C replacement between June 2006 and September 2008.There were 7 cases of C3/4，10 cases of C4/5，27 cases of C5/6 and 9 cases of C6/7 involved respectively.Segmental ROM，angular variation at functional spinal unit（FSU），Cobb angle of lordosis from C2 to C7 were measured and compared on dynamic X-rays by picture archive & communication system（PACS）.Result：The follow-up averaged 13.8 months（range，3-36 months）.The segmental ROM was 8.6°±3.7° and 9.7°±3.5° for baseline and final follow-up respectively with statistical significance（P<0.05）.The angular variation at FSU was 0.1°±4.8° and 3.6°±4.5° for baseline and final follow-up respectively with statistical significance（P<0.05）.The lordosis Cobb angle of C2-C7 was 7.0°±10.2° and 8.0°±10.4° for baseline and final follow-up respectively without statistical significance（P>0.05）.Conclusion：After single-level ProDisc-C replacement，increase of segmental ROM，maintaining of cervical alignment as well as the increased FSU lordosis are evidenced.The ProDisc-C prosthesis is recommended for the candidates with decreased lordosis or slight FSU kyphosis.