The Hintermann Series H3® Total Ankle Replacement System (Hintermann Series H3) is a non-constrained, mobile bearing three-component total ankle replacement system approved by the FDA. The Hintermann Series H3 is indicated for use as a non-cemented implant to replace a painful arthritic ankle joint due to:
The Hintermann Series H3 Total Ankle Replacement System, also referred to as the H3, is intended to replace the ankle joint. The device permits four degrees of freedom, providing an unconstrained tibial articulating surface and a semi-constrained talar articulating surface for anteroposterior translation, mediolateral translation, tibial rotation, and dorsi/plantar flexion movement. The Hintermann Series H3 consists of a tibial component, a talar component, and an ultra-high molecular weight polyethylene mobile bearing insert (PE inlay).
The tibial implant is manufactured from cobalt chromium and is designed as a bone-sparing device. It resurfaces the tibia with a large flat surface to provide a physiological load transfer and minimal contact stress to the bone. The tibial component has a low profile anterior shield which is intended to provide rotational stability of the component and to prevent scarring and bone formation that may hinder joint motion. The superior peaks at the implant-bone interface are designed to provide anchoring in the subchondral bone to aid stability against translation and rotation.
The bearing surface of the Hintermann Series H3 talar component is anatomically shaped with a frusto-conical surface designed to allow for physiological talar motion through eversion with dorsiflexion to minimize stress on the soft tissues supporting the ankle joint. The medial and lateral rims help to guide movement of the UHMWPE bearing assembly while the anterior pegs help improve sagittal stability and positioning of the talar implant. A flat cut talar option is available for patients with less bone stock.
The Polyethylene (PE) Inlay is manufactured from ultra-high molecular weight polyethylene with a high congruency with the metal surfaces of both tibial and talar components. The PE inlay allows unconstrained gliding (sagittal and frontal plane) on the flat tibial surface with a semi-constrained free sagittal plane motion on the anatomical frusto-conically-shaped talar component. The PE inlay is designed to maintain maximum contact area with the tibial and talar components through normal joint motion to minimize contact stresses and wear, and to provide intrinsic stability against eversion-inversion forces. The PE inlay also includes titanium radiographic markers.