title: Evaluation of P-POSSUM scoring system in predicting mortality in patients with hip joint arthroplasty.
abstract: OBJECTIVE
  To evaluate the applicability of Porthsmouth modified physiological and operative severity score for the enumeration of mortality and morbidity (P-POSSUM) in predicting the mortality of the patients undergoing hip joint arthroplasty.
  
  
  METHODS
  A total of 141 patients (75 males and 66 females, aged 63.22 years+/-14.45 years on an average) undergoing hip joint arthroplasty during January 2002 and March 2005 were studied retrospectively with P-POSSUM. Their average physiological score and operative severity score were 17.48+/-5.16 and 12.43+/-3.05, respectively. The predicted postoperative mortality with P-POSSUM was compared with the observed value. Subgroup analysis was performed to investigate the predictive capability of P-POSSUM. POSSUM scoring system was used as the control.
  
  
  RESULTS
  Three patients died after operation in this study actually. The average physiological scores were 32.33+/-9.87 in the death group and 17.16+/-4.56 in the survival group. The former was obviously higher than the latter, which showed statistical difference between the two groups (Wilcoxon rank sum test, P<0.05). Perfect agreement was found between the observed death number and the predicted death number calculated by P-POSSUM (Cochran-Mantel-Haenszel chi(2) test, P>0.05), though POSSUM overestimated the overall mortality.
  
  
  CONCLUSIONS
  P-POSSUM can predict the mortality accurately in the patients undergoing hip joint arthroplasty, which is superior to POSSUM.
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, Jilin University, Changchun 130021, China. guguishan@sina.com
authors.forename: Gui-shan
authors.initials: GS
authors.lastname: Gu
authors.forename: De-bao
authors.initials: DB
authors.lastname: Zhang
authors.forename: Bo-hao
authors.initials: BH
authors.lastname: Zhang
authors.forename: Nai-kun
authors.initials: NK
authors.lastname: Sun
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000401:mortality*; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012720:Severity of Illness Index