Changes in the cross-sectional area of deep posterior extensor muscles of the cervical spine after anterior decompression and fusion: 10-year follow-up study using MRI |
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Authors: | Morio Matsumoto Eijiro Okada Daisuke Ichihara Kota Watanabe Kazuhiro Chiba Yoshiaki Toyama Hirokazu Fujiwara Suketaka Momoshima Yuji Nishiwaki Takeshi Hashimoto Akio Iwanami Takeshi Ikegami Takeshi Takahata |
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Affiliation: | 1. Department of Orthopaedic Surgery, Keio University, Shinanomachi 35, Shinjuku-ku, Tokyo, #160-8582, Japan 2. Department of Diagnostic Radiology, Keio University, Minato, Japan 3. Department of Preventive Medicine and Public Health, Keio University, Minato, ?Japan 4. Department of Orthopaedic Surgery, Keio University Tsukigase Rehabilitation Center, Shizuoka, Japan 5. Department of Orthopaedic Surgery, Murayama Medical Center, Higashiyamato, Japan 6. Department of Orthopaedic Surgery, Isehara Kyodo Hospital, Isehara, Japan
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Abstract: | PurposeTo evaluate changes in the transverse area of deep posterior muscles of the cervical spine 10 years after anterior cervical decompression and fusion (ACDF), in comparison with healthy volunteers.MethodsThirty-one patients (22 males, 9 females, mean age at follow-up 59.3 years, mean follow-up 12.1 years) who had undergone preoperative MRI and non-instrumented ACDF within levels C3-4 to C5-6 were enrolled. 32 asymptomatic volunteers (17 males, 15 females; mean age, 54.7 years; mean follow-up, 11.7 years) who underwent MRI between 1993 and 1996 served as controls. Follow-up MRI was performed on both patients and control subjects, and the cross-sectional areas of deep posterior muscles were measured digitally at levels C3-4, 4-5, and 5-6.ResultsThe mean total cross-sectional area in the ACDF and control groups was 4,693.6 ± 1,140.9 and 4,825.8 ± 1,048.2 mm2 in the first MR study (P = 0.63), and 4,616.7 ± 1,086.0 and 5,036.7 ± 1,105.6 mm2 at follow-up (P = 0.13). The total cross-sectional area in the ACDF group slightly decreased, while that in the control group increased (−77.1 ± 889.7 vs. 210.9 ± 622.0 mm2, P = 0.14). The mean change in the cross-sectional area had no significant correlation with clinical symptoms, including neck pain or JOA score.ConclusionsACDF patients did not show a marked decrease in the cross-sectional area of the deep posterior cervical muscles, but as compared with control subjects there was a slight decrease. A decrease in the cross-sectional area of these muscles after ACDF may not result in the axial symptoms as seen in patients treated by posterior surgery. |
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Keywords: | Cervical spine Anterior decompression and fusion MRI Posterior extensor muscle |
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