Hydrogel Construct for Temporomandibular Joint (TMJ) Disc Replacement

A donor TMJ and a novel construct TMJ
Opportunity

Available for Licensing

IP Status

US Provisional Patent

Inventors

Jason Kuiper

Kevin Labus

Reference No: 2022-047
Licensing Manager

Steve Foster
Steve.Foster@colostate.edu
970-491-7100

At a Glance

Researchers in the Orthopaedic Biomedical Research Lab (OBRL) at Colorado State University have developed a patient specific molded polyvinyl alcohol (PVA) hydrogel with a microfiber mesh. These new hydrogel constructs are created using computed tomography (CT) images to mold to a patient’s anatomy. This combination represents a promising artificial replacement strategy for the temporomandibular joint disc.

 

Background

The temporomandibular joint (TMJ) acts like a sliding hinge, connecting the jawbone to the skull. TMJ disorders, a type of temporomandibular disorder or TMD, can cause pain in the jaw joint and in the muscles that control jaw movement (1). State of the art treatments for temporomandibular joint disorders begin with palliative patient care such as rest and soft diet, or bite guards and physical therapy. If pain persists, the gold standard surgical technique is disc resection. A temporalis muscle flap or skin/fat autograft may be used in place of the resected disc, however this does not seem to improve outcomes over resection.

Currently, there are no available artificial TMJ disc replacements. TMJ degeneration typically accelerates post resection, leaving many patients unable to use their jaw fully and pain free.

Overview

The hydrogel construct described here would be an early intervention for preventing the advance of TMD. By replacing the disc with an artificial one, made of biocompatible PVA with exceptional mechanical toughness and a low coefficient of friction, surgeons may prevent the need for a total TMJ replacement and restore TMJ functionality for patients.

 

Figure 1 (below) illustrates the substantial similarities in mechanical properties of the hydrogel construct as compared to native TMJ disc.

 

Graphs from data analysis

Figure 1: Comparative mechanical properties of the ovine TMJ disc and a 20% weight PVA hydrogel from (A) friction at different applied pressures, (B) indentation in short and long term states, (C) unconfined compression, and (D) tensile testing aligned in the anterior-posterior (AP) and medio-lateral (ML) anatomic planes.
Benefits
  • Molded to patient imaging scans, giving an individualized fit
  • Comparative mechanical properties to native TMJ disc (see additional figures)
  • Tunable properties may allow for other cartilage constructs to be replaced (i.e. menisci)
  • Can be modified to include drug release or tissue integration characteristics
Applications
  • Disc replacement
    • temporomandibular joint (TMJ)
    • meniscus
    • spinal disc

Last updated: April 2022