# Malseated Liner in Modular Dual Mobility Total Hip Replacement: A Report of Three Cases

## TL;DR

This paper reports three cases where a hip replacement implant was improperly seated, leading to complications that required revision surgery.

## Contribution

The paper highlights the importance of careful surgical technique and postoperative imaging to avoid complications from malseated modular dual mobility hip implants.

## Key findings

- A malseated liner was detected intraoperatively in one case but required revision of the entire shell.
- In two cases, malseating was missed during surgery and required early postoperative revision.
- The study emphasizes the need for meticulous surgical and imaging practices to prevent complications.

## Abstract

Modular dual mobility total hip arthroplasty (THA) can be associated with complications if the liner is malseated, which can be unappreciated intraoperatively. A meticulous surgical technique is needed to ensure that the liner is perfectly seated. In addition, a malseated liner can be missed if the postoperative films are not carefully reviewed by the surgeon.

We present three cases of THA associated with a malseated modular dual mobility liner. In one case, the malpositioned liner was appreciated intraoperatively, but it was wedged in place and could not be removed. The entire shell needed to be revised. In two other cases, malseating was not detected intra-operatively. Both were appreciated postoperatively, and early revision surgery was needed.