Related Experiment Video
Updated: Feb 11, 2026
Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach
Published on: July 21, 2023
High Rate of Failure After Revision of a Constrained Liner
Michael D Hellman1, David J Kaufman2, Scott M Sporer3
1California Orthopedics & Spine, Larkspur, CA.
Background:
The purpose of this study was to examine the outcomes of repeat revision after failure of a constrained liner.
Methods:
We reviewed 1212 consecutive revisions and identified 74 (6%) revisions of a failed constrained liner in 46 patients with a mean age of 65 years. The most common reasons for revision of a constrained liner were recurrent instability (64.9%) and infection (25.7%).
Results:
At a mean of 35 months, 42 of the 74 hips (57%) required repeat revision. Kaplan-Meier revision-free survival was 24% at 10 years. Thirty-two of the 74 revisions (43%) had a dislocation event after the index revision. Kaplan-Meier dislocation-free survival was 43% at 10 years. There was a higher failure rate among the 34 patients with abductor deficiency (hazard ratio 1.90, 95% confidence interval, 1.06-3.43; P = .032).
Conclusion:
Patients undergoing revision of a failed constrained liner have a high likelihood of recurrent dislocation and repeat revision surgery.
Level Of Evidence:
Level IV.
Related Concept Videos
02:53Reaction Rate
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
01:18Related Rates
01:07Speciation Rates
03:09Measuring Reaction Rates
03:08Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
03:03Concentration and Rate Law
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as: