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Subtalar Implant Surgically Corrects Flat Feet

By HospiMedica International staff writers
Posted on 25 Dec 2018
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Image: The PitStop Subtalar Implant is made of PEEK, rendering it softer than metal implants (Photo courtesy of I2Bones Global).
Image: The PitStop Subtalar Implant is made of PEEK, rendering it softer than metal implants (Photo courtesy of I2Bones Global).
A novel polymer implant made of polyetheretherketone (PEEK) aids the correction of progressive flat foot deformity in both pediatric and adult populations.

The In2Bones Global (Memphis, TN, USA) PitStop subtalar implant is an inert, biocompatible, flexible implant indicated for the treatment of the hyperpronated foot and stabilization of the subtalar joint by blocking forward, downward, and medial displacement of the tallus. The PEEK cannulated implant is composed of two symmetrical and flattened sides, and small lock-in blades which allows for placement in the sinus tarsi with better load distribution on bone surfaces--when compared to stiffer materials, such as titanium and stainless steel.

The first step involves a trial implant placed over a guide-wire and seated in the sinus tarsi, verified by fluoroscopy with the aid of two tantalum X-Ray markers located at each end of the implant. Hindfoot mobility is then assessed and the size may be adjusted accordingly. The flat surfaces of the trial implant and the inserter handle are then aligned so as to parallel the lateral talar process, and the trial implant is removed, leaving the guide-wire in place. The PitStop implant is then positioned over the guidewire or placed using a Viladot Lever, with fixation achieved by the anti-return flanges.

The anatomical shape of the PitStop subtalar implant reduces compressive constraints and improves stress distribution, thus decreasing the incidence of reactive synovitis and improving patient tolerance. The implant should be removed at the end of the growth period (when used in pediatric patients), 12 months after placement when used in adult patients, or if pain occurs earlier. The PitStop subtalar implant is available in seven sizes, from 10 mm to 17mm.

“The unique ‘see-through’ PitStop implant demonstrates In2Bones’ commitment to expanding the extremities market by launching innovative technological advancements that improve surgical outcomes and patient care,” said the company in a press statement. “To support the commercial launch of the PitStop implant, In2Bones recently published a micro website providing physicians and healthcare professionals with easy to access educational content. The materials on the site will include surgical animations and videos, surgical technique guides, case studies, patient support materials, and more.”

Flat feet (also known as pes planus or fallen arches) is a postural deformity in which the arches of the foot collapse, with the entire sole coming into complete or near-complete contact with the ground, causing the head of the talus bone to be displaced medially and distal from the navicular bone. As a result, the spring ligament and the tendon of the tibialis posterior muscle are stretched, causing loss of function of the medial longitudinal arch (MLA).

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