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Objective: The purpose of this study is to develop a one-stop procedure based on 3.0-T MR dynamic imaging to exam female floor structure and to determine whether female pelvic dysfunction is associated with specific pelvic floor abnormalities.Methods: From May 2010 to November 2013,230 consecutive patients who had symptoms of chronic constipation,feeling of incomplete evacuation,pain during defecation,and/or faecal incontinence were enrolled.MR features of pelvic floor dysfunction,which include rectocele,enterocele,uterine prolapse,cystocele,rectal prolapse and rectal intussusception,were evaluated and recorded.The left and right sides of the pubovisceral muscle were scored separately,as follows: 0,normal appearance of the muscle; 1,identifiable connection of the muscle to the pubis but <50%of expected muscle bulk missing; 2,≥50%of expected muscle bulk missing but the presence of a connection of the muscle to the pubis; and 3,complete detachment of the muscle from the pubis.A total score for the two sides(0–6)was then assigned and categorized as no defect(0),minor pubovisceral avulsion(1–3)or major pubovisceral avulsion(4–6,or a unilateral score of 3).All cases were analyzed by two experienced radiologists.Both the pubo-coccygeal line(PCL)and the HMO system(H line,M line and pelvic organ prolapse below the H line)were used in order to determine and assess the severity of pelvic floor weakness.Correlation between the extent of pubovisceral muscle avulsion and classification of pelvic floor weakness were performed using spearmn test.Results:Based on the pubovisceral muscle scores,85,102 and 43 cases were categorized to normal,minor and major avulsion group.According to HMO grading system,7,121,89 and 4 cases were scored as grade1,grade 2,grade 3 and grade 4,respectively.The extent of pubovisceral muscle avulsion significantly correlated with classification of pelvic floor weakness.The Spearman correlation coefficient was 0.274.Conclusions: The extent of pubovisceral muscle avulsion significantly correlated with classification of pelvic floor weakness.The avulsion of pubovisceral muscle may be the major risk factor for pelvic floor weakness,which may further cause pelvic floor dysfunction.