title: Incidence of hip replacement among national health insurance enrollees in Taiwan.
abstract: BACKGROUND
  There is no national joint replacement registry in the country of Asia and reports of national outcomes of joint replacement in Asia as yet. Therefore, this study was then to report a national data of the number of hip replacements, incidence rate, demographic characteristics of hip replacement patients, and short-time survival rate after hip replacement of Han Chinese in Taiwan.
  
  
  METHODS
  We analyzed 105,688 cases of hip replacements (including primary partial hip replacement, primary total hip replacement and revision of hip replacement) from National Health Insurance research database between 1996 and 2004. The survival rate of primary hip replacement was estimated for each disease by the Kaplan-Meier method.
  
  
  RESULTS
  Average annual number of primary partial hip replacement and primary total hip replacement were 4,257 and 6,206 cases, respectively. The most two common diagnosis of primary partial hip replacement were femoral neck fractures (73.6%, 34% men, mean age 76 years) and avascular necrosis (18.0%, 84% men, mean age 48 years). In primary total hip replacements, the most two common diagnosis were avascular necrosis (46.9%, 79% men, mean age 50 years) and osteoarthrosis (41.6%, 43% men, mean age 60 years). Both the number of primary partial hip replacements and primary total hip replacements increased steadily between 1996 and 2004. The cumulative survival of primary partial hip replacements and primary total hip replacements in all patients were 93.97% and 79.47% in 9 years follow-up, respectively.
  
  
  CONCLUSIONS
  Avascular necrosis is the main disease in total hip replacement in Taiwan. The epidemiology of hip diseases was different between Han Chinese (in Taiwan) and Caucasian and the number of hip replacements increased substantially in Taiwan between 1996 and 2004.
authors.affiliation: Institute of Biomedical Engineering, National Yang Ming University, Taipei, Taiwan.
authors.forename: Yu-Shu
authors.initials: YS
authors.lastname: Lai
authors.forename: Hung-Wen
authors.initials: HW
authors.lastname: Wei
authors.forename: Cheng-Kung
authors.initials: CK
authors.lastname: Cheng
references.citation: Ann Rheum Dis. 1995 Feb;54(2):107-10
references.pmid: 7702396
references.citation: Clin Orthop Relat Res. 1997 Nov;(344):124-38
references.pmid: 9372765
references.citation: J R Coll Surg Edinb. 1981 Mar;26(2):69-77
references.pmid: 7218208
references.citation: J Bone Joint Surg Am. 2002;84-A Suppl 2:2-20
references.pmid: 12479335
references.citation: Acta Orthop Scand. 2004 Apr;75(2):142-6
references.pmid: 15180228
references.citation: J Bone Joint Surg Br. 1994 May;76(3):423-7
references.pmid: 8175846
references.citation: N Y State J Med. 1992 Aug;92(8):334-8
references.pmid: 1513511
references.citation: Clin Orthop Relat Res. 1992 Sep;(282):123-31
references.pmid: 1516303
references.citation: Bull Hosp Jt Dis. 1999;58(3):139-47
references.pmid: 10642863
references.citation: Health Aff (Millwood). 2003 May-Jun;22(3):61-76
references.pmid: 12757273
references.citation: J Bone Joint Surg Br. 2001 May;83(4):579-86
references.pmid: 11380136
references.citation: J Arthroplasty. 2001 Jan;16(1):92-101
references.pmid: 11172277
references.citation: Pediatrics. 2004 Dec;114(6):e678-82
references.pmid: 15574600
references.citation: Arch Phys Med Rehabil. 1990 Sep;71(10):739-41
references.pmid: 2403279
references.citation: Int Orthop. 1995;19(5):304-8
references.pmid: 8567139
references.citation: Clin Orthop Relat Res. 2004 Jul;(424):161-5
references.pmid: 15241159
references.citation: Clin Orthop Relat Res. 1989 Jul;(244):198-207
references.pmid: 2743660
references.citation: Clin Orthop Relat Res. 1996 Feb;(323):81-90
references.pmid: 8625610
references.citation: Arch Intern Med. 1978 May;138(5):750-4
references.pmid: 646538
references.citation: J Bone Joint Surg Am. 1995 Mar;77(3):459-74
references.pmid: 7890797
references.citation: Psychiatr Serv. 2004 Jun;55(6):691-7
references.pmid: 15175468