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Objective To investigate therapeutic effect of selective posterior rhizotomy in the treatment of lower limbs spasm following cerebral palsy.Method 106 cases received selective posterior rhizotomy.Postoperational follow up was carried for 6～ 36 months,averagely 18 months.Result All cases showed complete relief in muscular spasm,decreased muscular tension.Ashworth grade (1～ 1.5)was 1.3.Dynamic abnormality in joints were all corrected.Conclusion Selective posterior rhizotomy can effectively relieve lower limbs spasm,reduce muscular tension and correct dynamic joint abnormality.rn