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Predictors of failed reduction after prosthetic hip dislocation.

Nicholas Frappa¹, Danil Chernov², Aidan G Papalia³

¹Jacobs School Of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, USA. nmfrappa@buffalo.edu.

European Journal of Orthopaedic Surgery & Traumatology : Orthopedie Traumatologie

|November 12, 2025

Summary

Closed reduction of prosthetic hip dislocations is more successful outside the emergency department. Longer procedures decrease success rates, indicating a need for timely escalation to surgery.

Keywords:

Anesthesia Closed reduction Emergency department Procedural sedation Prosthetic hip dislocation Total hip arthroplasty

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Published on: February 27, 2018

Area of Science:

Orthopedic surgery
Anesthesiology
Emergency medicine

Background:

Prosthetic hip dislocation is a common complication after total hip arthroplasty (THA).
Closed reduction under procedural sedation is the standard initial management.
Factors influencing reduction success require further investigation.

Purpose of the Study:

To evaluate the impact of sedation strategy, procedural location, and patient factors on closed reduction success for prosthetic hip dislocations.
To identify predictors of successful closed reduction and thresholds for escalation.

Main Methods:

Retrospective review of 201 prosthetic hip dislocation reduction encounters (2014-2024) at two tertiary centers.
Analysis of demographic, procedural, and pharmacologic data using logistic regression.
Receiver operating characteristic (ROC) analysis to determine escalation thresholds.

Main Results:

Overall closed reduction success rate was 73.1% (54.3% in ED vs. 94.4% in OR).
Non-emergency department (ED) location was the strongest predictor of success (OR 38.4, p < 0.001).
Procedure duration was inversely associated with success in the ED (OR 0.88/min, p = 0.047), with an escalation threshold around 25 minutes.

Conclusions:

Reduction location is the dominant factor influencing closed reduction success for prosthetic hip dislocations.
Protracted procedures necessitate early consideration of operative intervention.
Standardized protocols and algorithmic triage may improve success rates and resource utilization.