Cellbrick Knee | United Orthopedic Corporation

Product Overview

The Cellbrick™ Knee Spacer is intended for use in two-stage revision total knee arthroplasty for the management of periprosthetic joint infection (PJI). Its articulating design is intended to maintain joint space and limb length following implant removal, and to support joint mobility during the interim period.

Fenestrated Spacer Core

The fenestrated structure is designed to accommodate antibiotic-loaded bone cement, allowing for local antibiotic delivery. An optional intramedullary rod may be used to extend application into the femoral or tibial canal.

Biomechanical & Biological Safety

The UHMWPE femoral and tibial spacer components are designed to provide articulation and structural support during implantation, while helping to maintain soft tissue tension and joint function.

Product Features

Femoral Spacer

Universal design with a symmetrical configuration to fit both left and right knees.

Prefabricated cement carrier with a 1:1 AP-to-ML ratio designed to accommodate bone cement.

UHMWPE spacer core with clinically established biocompatibility and safety for use in orthopedic applications.

Fenestrated design providing space to accommodate bone cement for local application.

Intercondylar slot designed to preserve a passage for optional canal rod insertion.

Tibial Spacer

Fenestrated design providing space to accommodate bone cement for local application.

Central through-hole in the tibial spacer designed to be compatible with optional canal rod insertion.

Extended anterior lip serving as a physical stopper to limit femoral anterior sliding and enhance joint stability with an anterior chamfered, soft tissue–friendly design.

Ultra-congruent (UC) bearing concept with a stable mobile spacer design that enhances stability and reduces the risk of dislocation.

UHMWPE spacer core with clinically established biocompatibility and safety for use in orthopedic applications.

Canal Rod

Mushroom-shaped end designed to support cement-wrapped canal rod during removal.

Ti‑6Al‑4V alloy with established biocompatibility, designed to assist in carrying cement deep into the canal for infection management.

Set screw protecting the canal rod top threads from cement intrusion and removable to expose the threads during extraction.

Femoral Spacer Mold

Reusable design intended to support multiple sterilizations and reduce medical waste.

Latch design providing stable mold positioning before bone cement setting.

Biocompatible medical-grade silicone with a flexible design to facilitate demolding after spacer formation.

Multi-size compatible spacer mold case designed to streamline instrument use and reduce space requirements.

Spacer mold and mold case designed to apply pressure for achieving the desired articulating surface of the mobile spacer.

Tibial Spacer Mold

Demonstrated Infection Management

Sustained local gentamicin release maintained above clinically effective levels for 30 days with minimal systemic exposure, supporting infection management in both bench and in-vivo evaluations.

Chang, Y., Lee, M. S., Liau, J. J., Liu, Y. L., Chen, W. C., & Ueng, S. W. (2020). Polyethylene-based knee spacer for infection control: Design concept and pre-clinical in vitro validations. Polymers, 12(10), 2334.

UOC-RD-TR-22050. Data held on file. United Orthopedic Corporation.

UOC-RD-TR-17022. Data held on file. United Orthopedic Corporation.

UOC-UPD-SI-25001. Data held on file. United Orthopedic Corporation.

Product Overview

Product Features

Demonstrated Infection Management

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