# Management of Clamshell Fractures in Total Hip Arthroplasty: A Rarely Recognized Periprosthetic Injury Pattern

## TL;DR

This paper reviews clamshell fractures, a rare and underrecognized type of hip replacement complication, and discusses their treatment options.

## Contribution

The paper introduces clamshell fractures as a distinct and underappreciated periprosthetic injury pattern in hip arthroplasty.

## Key findings

- Clamshell fractures are not well recognized in current classification systems for periprosthetic femoral fractures.
- Treatment options for clamshell fractures vary based on patient-specific factors and stem stability.
- Standardized therapeutic approaches for clamshell fractures remain poorly defined in the literature.

## Abstract

Periprosthetic femoral fractures (PPFFs) represent the third most frequent indication for revision total hip arthroplasty (THA). Given the steadily increasing number of primary hip replacements, this complication is gaining growing attention among orthopedic surgeons. Clamshell fracture (CF) constitutes a particularly controversial and underrecognized fracture pattern that, for a long time, was not accounted for in the commonly used classification systems for PPFFs. Recent studies suggest that the incidence and clinical relevance of these injury patterns have been underestimated. Therapeutic options are manifold and depend on various patient-specific factors as well as stem stability. Despite this, the current literature remains limited, and standardized therapeutic approaches are still poorly defined. This review aims to provide a comprehensive overview of clamshell fractures as a distinct pattern of periprosthetic injuries. Furthermore, relevant treatment options dependent on biomechanical considerations will be outlined and discussed.