title: Is urinary incontinence the hidden secret complications after total hip arthroplasty?
abstract: BACKGROUND
  We hypothesized that posterior approach (PA) dissecting the short external rotators and anterior approach (AA) not dissecting these have different influences on the pelvic floor muscles and subsequently affect urinary incontinence. The objective of this study was to investigate whether AA advantageously influences symptoms of urinary incontinence.
  
  
  METHODS
  The subjects were 76 female patients who underwent their primary total hip arthroplasty. The presence or absence of urinary incontinence before and after surgery was surveyed by a direct interview at the time of outpatient examination within a period from 1.5 year after surgery using the international consultation on incontinence questionnaire-short form.
  
  
  RESULTS
  Urinary incontinence improved after surgery in eight patients (22.2%), slightly improved in one (2.8%), remained unchanged in 26 (72.2%), slightly aggravated in one (2.8%) in the AA group. In the PA group, urinary incontinence improved after surgery in one (2.5%), remained unchanged in 30 (75%), slightly aggravated in four (10%), and aggravated in five (12.5%). Symptoms of urinary incontinence were significantly improved in the AA group and aggravated in the PA group (Mann-Whitney U test, P = 0.0057).
  
  
  CONCLUSIONS
  As the anatomical characteristic of the short external rotators, the root of the internal obturator muscle is connected to the levator ani muscle. Among the pelvic floor muscles, this levator ani muscle is closely involved in supporting the pelvic organs. Since the short external rotators may have been atrophied due to hip joint dysfunction before surgery, if the strength of this muscle group recovers, support of the pelvic organs and urinary incontinence may be improved. It was assumed that surgery through AA improved external rotation contracture of the hip joint and leg length, which increased tension of the internal obturator muscle, with which tension of the pelvic floor muscle also increased and improved urinary incontinence.
authors.affiliation: Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan, tobaba@juntendo.ac.jp.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Baba
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Homma
authors.forename: Naoko
authors.initials: N
authors.lastname: Takazawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Mikio
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Aritomi
authors.forename: Takahito
authors.initials: T
authors.lastname: Yuasa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kaneko
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000379:methods; D005260:Female; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014549:Urinary Incontinence / Q000453:epidemiology / Q000209:etiology*