Wrist arthroplasty system and method
Inventors
Smith, Terrence Chadwick • Morse, Bryon Marshall • Sommers, Mark Bernhard • Pailthorpe, Charles Andrew
Assignees
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Publication Number
US-12274625-B2
Publication Date
2025-04-15
Expiration Date
Abstract
The present disclosure provides for a wrist arthroplasty system and method that enable an expedient surgical procedure, maintain wrist motion, and reduce the likelihood of implant loosening. The system includes a capitate implant, a radial implant, and a resection instrument. The capitate implant includes a convex head formed to interface with a concave socket of the radial implant. The capitate implant includes a single stem formed to be secured within a patient's capitate bone. The radial implant includes lips formed to increase wrist joint motion and to help prevent dislocation of the capitate implant from the radial implant. The resection instrument may be used in combination as a measurement tool for determining the proper implant size, a guide for properly positioning the implants, and a trial tool for testing trial implant components before securing the final radial and capitate implants.
Core Innovation
The disclosed subject matter describes a wrist arthroplasty system and method that uses a resection instrument with a set of interchangeable distal radius guides, a guide block, and a depth control instrument. Each distal radius guide includes a trial socket formed integrally with a reaming guide to facilitate positioning and controlled preparation of the distal radius surface.
In the method, scaphoid, lunate, and triquetrum are excised, and the distal radius and proximal capitate surfaces are prepared while preserving subchondral bone. A respective distal radius guide is selected based on a radius bone and is used with the resection instrument to prepare the distal surface with the aid of the integrally formed reaming guide and to support subsequent implant alignment based on the trial socket.
Capitate implant alignment is performed based on the respective trial socket while the guide block is removably secured to the radius bone, and the capitate implant is secured by inserting a capitate stem within a capitate hole created in the capitate bone. The system provides an offset hole to lock capitate implant rotation via stem protrusion, supports aligning and securing a radial implant according to alignment marks on the guide block, and uses cement to secure the capitate and radial implants before the guide block is removed.
Claims Coverage
The partial content provides one independent claim (clm-00001). Across the claim set, the main inventive features center on a wrist arthroplasty method using a resection instrument with interchangeable distal radius guides, where each guide includes an integrally formed trial socket and reaming guide, together with guided alignment and implantation using the guide block, trial components, and securing of capitate and radial implants.
Interchangeable distal radius guides with integrally formed trial socket and reaming guide
A wrist arthroplasty method using a resection instrument including a set of interchangeable distal radius guides, wherein each respective distal radius guide includes a trial socket formed integrally with a reaming guide.
Selecting a distal radius guide based on a radius bone and using the reaming guide for distal radius preparation
Selecting, based on a radius bone, a respective distal radius guide from the set of interchangeable distal radius guides for use with the resection instrument, and preparing a distal surface of the radius bone with the aid of the respective reaming guide while the guide block is removably secured to the radius bone.
Guide block removably secured to the radius bone for alignment of capitate and radial implants
Removably securing the guide block to the radius bone, aligning a capitate implant based on the respective trial socket while the guide block is removably secured to the radius bone, and aligning a radial implant according to alignment marks on the guide block removably secured to the radius bone.
Securing capitate implant via capitate stem inserted within capitate hole
Securing the capitate implant to a capitate bone such that a capitate stem of the capitate implant is inserted within a capitate hole created in the capitate bone.
Securing radial implant via radial stem inserted within radial hole and then removing the guide block
Securing the radial implant to the radius bone such that a radial stem of the radial implant is inserted within a radial hole created in the radius bone, and removing the guide block from the radius bone.
Overall, clm-00001 covers a wrist arthroplasty workflow that combines interchangeable distal radius guides with integrally formed trial socket and reaming guide, guided distal radius preparation and implant alignment using a removably secured guide block, and securing of both capitate and radial implants using stem insertion into corresponding created bone holes, followed by removal of the guide block.
Stated Advantages
Expedient surgery.
Preserved wrist motion.
Reduced implant loosening.
Documented Applications
Wrist arthroplasty, including excision of scaphoid, lunate, and triquetrum and implantation of a capitate implant and a radial implant using the described resection instrument.
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