# Distal Femur Cemented Modular Prosthesis Failure Causing a Medical Device-Related Adverse Event: A Report of a Rare Case

## TL;DR

A rare case report describes a failed distal femur prosthesis in a young osteosarcoma patient, causing severe pain and mobility loss.

## Contribution

This report highlights a rare adverse event linked to a distal femur cemented modular prosthesis in a post-osteosarcoma patient.

## Key findings

- A 24-year-old patient experienced sudden severe pain and inability to bear weight due to prosthesis malfunction.
- The failure occurred during a routine activity, indicating potential implant design or material issues.
- The case underscores the need for careful monitoring of modular prostheses in young patients.

## Abstract

A distal femoral cemented modular prosthesis is a viable option for post-bone tumor and limb salvage procedures. The major reasons for implant failures are the poor quality of implants, mechanical stress, biochemical reactions, and extended period of the implant in vivo use. Rare incidences have been reported of distal femur prosthesis implant malfunctioning in a subject having osteosarcoma. Common adverse events associated with implant failure include surgical site infections, swelling, pain, revision of the surgical procedure, cyst formation, and build-up of metal debris on soft tissues. Our case report summarizes gross malfunctioning of a distal femur cemented modular prosthesis experienced by a 24-year-old post-operated osteosarcoma patient who developed excruciating sudden pain and the inability to bear weight on the right leg, with the sudden onset of these symptoms developing while turning in bed.