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Risk Factors for Conversion of Hip Arthroscopy to Total Hip Arthroplasty: A Large Closed-Cohort Study (Arthroscopy, Sports Medicine, and Rehabilitation)

Publication Topics

California Health Interview Survey; 2001 CA Health Interview Survey (CHIS 2001); Local-level/Community Population

Publication Type

CHIS Journal Article

Publication Date


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<a onclick="OpenPopUpPage('http:\u002f\\u002f_layouts\u002flistform.aspx?PageType=4\u0026ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}\u0026ID=1813\u0026RootFolder=*', RefreshPage); return false;" href=";ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}&amp;ID=1813&amp;RootFolder=*">Sachin Allahabadi</a>

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Summary: Authors evaluate risk factors for conversion of hip arthroscopy to total hip arthroplasty (THA) within two years in a closed patient cohort.

This study was a case series of consecutive hip arthroscopy procedures from September 2008 to November 2018 in the electronic medical record of Kaiser Permanente Northern California. Patients were included with minimum two-year follow-up or if they had conversion to THA within two years (the primary outcome) regardless of follow-up time. Patient characteristics at the time of the index arthroscopy were extracted; characteristics of patients who experienced the outcome event versus those who did not were compared by use of multivariable logistic regression models and receiver operating characteristic (ROC) curves.

Findings: The mean follow-up time was 4.9 years (median 4.6, range 0.6 to 11.6). The mean age was 37.2 years (range 10 to 88), and 57% were female. During the follow-up period, 82 patients underwent a THA within 2 years of their arthroscopies (5.3%, 95% confidence interval 4.3% to 6.5%) after a median time of 9 months (interquartile range 5.9 to 14.4) after the initial arthroscopy. Increasing age was highly predictive of early THA conversion (area under the ROC curve = 0.78, P < .001). Although other predictors showed significant bivariable associations with early failure, body mass index (BMI), race, sex, and prior arthroscopy did not add meaningful independent predictive information.

The risk of conversion to THA within two years after hip arthroscopy increased substantially with patient age at the time of the procedure. BMI, race, sex, and prior arthroscopy were not important independent predictors of conversion beyond the information contained in patient age.

This study cites data from the 2011 California Health Interview Survey.


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Journal Article: Risk Factors for Conversion of Hip Arthroscopy to Total Hip Arthroplasty: A Large Closed-Cohort Study

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Press Release

Related Link 1

California Health Interview Survey (CHIS)

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Version: 3.0
Created at 11/17/2020 3:12 AM by i:0#.f|uclachissqlmembershipprovider|celeste
Last modified at 11/17/2020 3:27 AM by i:0#.f|uclachissqlmembershipprovider|celeste