# Tibial Lateral Condyle Fracture After Cementless Oxford Unicompartmental Knee Arthroplasty (UKA): A Report of Four Cases

## TL;DR

This paper reports four cases of tibial lateral condyle fractures after cementless Oxford unicompartmental knee arthroplasty, showing that these fractures can heal without surgery.

## Contribution

The study provides clinical evidence that lateral tibial fractures after cementless UKA can heal spontaneously, highlighting MRI's role in diagnosis.

## Key findings

- Four patients experienced tibial lateral condyle fractures after cementless Oxford UKA.
- MRI detected fractures not visible on initial radiography or CT.
- Bone union occurred within three months without surgical intervention.

## Abstract

Cementless unicompartmental knee arthroplasty (UKA) has a lower rate of radiolucency in postoperative follow-up than cemented UKA. However, the rate of tibial plateau fracture, one of the complications, has been reported to be higher in cementless UKA than in cemented UKA. We report four cases of postoperative tibial lateral condyle fractures after cementless Oxford UKA. Four patients underwent cementless Oxford UKA. Immediate postoperative radiography and CT showed no fracture lines. At five to six weeks postoperatively, MRI showed a fracture line from the intersection of the longitudinal and transverse tibial osteotomies through the lateral pinhole to the end of the lateral tibial diaphysis. At three months, bone union was observed without surgical treatments. Lateral tibial fracture after cementless Oxford UKA has a good clinical course without the need for surgical intervention. Medial fractures should thus be more actively prevented. MRI is useful for less symptomatic tibial lateral condyle fractures.