title: What preoperative patient-related factors predict inpatient recovery of physical functioning and length of stay after total hip arthroplasty? A systematic review.
abstract: OBJECTIVE
  To identify the preoperative patient-related characteristics predicting inpatient recovery of functioning and/or length of hospital stay after elective primary total hip arthroplasty.
  
  
  METHODS
  A search was conducted of the electronic databases MEDLINE, EMBASE and CINAHL from inception through April 2014. Observational studies were selected for systematic review if they identified clinically relevant preoperative prognostic factors and reported an association between inpatient recovery of physical functioning and/or length of hospital stay. Study participants were adults undergoing an elective primary total hip arthroplasty.
  
  
  RESULTS
  Fourteen studies were included, a total of 199,410 individual total hip arthroplasty procedures. Two studies investigated inpatient recovery of physical functioning, no strong level of evidence was found for a relationship between functional recovery and any of the preoperative predictors. Twelve studies investigated the length of hospital stay and reported 19 preoperative prognostic factors. A strong level of evidence suggested that higher scores on the American Society of Anaesthesiologists assessment (OR 3.34 to 6.22, +0.20 days), increased number of comorbidities (RR of 1.10, +0.59 to 1.61 days), presence of heart disease, (RR of 1.59, +0.26 days), and presence of lung disease (RR of 1.30, +0.34 days) were associated with longer lengths of hospital stay following total hip arthroplasty.
  
  
  CONCLUSIONS
  For the prediction of inpatient recovery of physical functioning no factors with a strong level of evidence were found. For length of stay there was a strong level of evidence for the American Society of Anaesthesiologists score, number of comorbidities, and presence of heart or lung disease.
authors.affiliation: Department of Physical Therapy, Diakonessenhuis Hospital, Utrecht, the Netherlands Department of Epidemiology, Maastricht University Medical Centre, the Netherlands jelings@diakhuis.nl.
authors.forename: J
authors.initials: J
authors.lastname: Elings
authors.affiliation: Department of Epidemiology, Maastricht University Medical Centre, the Netherlands Centre for Care Technology Research (CCTR), Maastricht, the Netherlands.
authors.forename: T J
authors.initials: TJ
authors.lastname: Hoogeboom
authors.affiliation: Department of Epidemiology, Maastricht University Medical Centre, the Netherlands Department of Physical Therapy, Nij Smellinghe, Drachten, the Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: van der Sluis
authors.affiliation: Department of Epidemiology, Maastricht University Medical Centre, the Netherlands Centre for Care Technology Research (CCTR), Maastricht, the Netherlands TNO Healthy Living, Leiden, the Netherlands.
authors.forename: N L U
authors.initials: NL
authors.lastname: van Meeteren
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D006801:Humans; D007902:Length of Stay; D020127:Recovery of Function; D016896:Treatment Outcome
keywords: Hip prosthesis; length of stay; preoperative factors; prognosis; recovery of function