• H Iizuka, T Shimizu, K Tateno, N Toda, H Edakuni, H Shimada, and K Takagishi.
• Section of Orthopaedic Surgery, Geriatrics Research Institute and Hospital, Gunma, Japan. ihaku@showa.gunma-u.ac.jp
• Spine. 2001 Oct 15; 26 (20): 222022262220-6.

Study DesignA radiographic study in 22 patients using magnetic resonance imaging was conducted.ObjectiveTo describe the relation between postoperative cervical alignment and morphologic evaluation of the cervical extensor musculature, especially semispinalis cervics in laminoplasty.Summary Of Background DataCervical laminoplasty has been widely accepted as a treatment for cervical myelopathy. Posterior procedures, however, involve the extensor musculature of the cervical spine.MethodsIn this study, 22 patients who underwent laminoplasty for repair of the extensor musculature were reviewed prospectively. The semispinalis cervics was evaluated by coronal view of the magnetic resonance image 1 month, 12 months, and 24 months after surgery. Cervical alignment at last follow-up assessment was compared with preoperative alignment using the lateral view of cervical radiographs.ResultsIn 18 patients (82%), morphologic repair of semispinalis cervics had been maintained (Group A), but in 4 patients (18%), but it had not been maintained at the last follow-up assessment (Group B). Cervical alignment in Group A had been maintained, but maximum loss of cervical lordosis occurred in Group B. Moreover, Group B consisted of elderly women.ConclusionsThe findings from this magnetic resonance imaging study suggest that the degree of semispinalis cervics repair affects postoperative cervical alignment, and significant loss of cervical lordosis tends to occur in elderly women who undergo laminoplasty.

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