9/13/2023 0 Comments Peek plastic injection molding![]() The hard metal ball causes abrasion against the adjacent carpal bones the titanium alloy prosthesis is expensive and requires premature customization, and it is difficult to adjust the size of such prosthesis and achieve the simulation and the bone cement prosthesis presents an unavoidable friction against the adjacent bones, which may lead to the abrasion and injury of the articular facet. The substitute implantation of capital and pisiform bone shift has complicated surgery and can damage the structure and partial function of the wrist. After surgery, however, the low-strength tendon is incapable to transmit the stress, and wrist synovitis and radial–scaphoid joint changes easily occur. Mariconda et al reported that tendon flap could be used for sufficient interposition in the cavity. Tendon mass and arcuated transparent cartilage are soft in the texture, and have poor long-term efficacy as wrist instability will easily happen after their implantation. ![]() Many substitutes are available to be implanted after lunate resection, for example, tendon mass, capital bone shift, metal ball, pisiform bone shift, titanium alloy prosthesis, silicone prosthesis, and bone cement implant. Therefore, choosing a suitable substitute is important for reconstructing radiocarpal joint and restoring wrist function, thus lunate resection + substitute implantation is a good therapy for Kienböck’s disease. Lunate resection often induces downward shift and disordered arrangement of the carpal bone, as well as causing wrist pain and dysfunction. Four surgical procedures are usually applied: Revascularization, biomechanical therapy, lunate resection, and substitute implantation. There are many therapies for Kienböck’s disease that have an uniform goal of conserving normal structure, restoring movement function, and relieving the clinical wrist symptoms. This is the first case report of a 3D-printed injection-molded PEEK lunate prosthesis in the treatment of stage III Kienböck’s disease, and aimed to present a new therapy and the clinical outcome of the disease. ![]() However, none of these has involved the application of 3D-printed injection-molded PEEK lunate prosthesis in the treatment of stage III Kienböck’s disease.īased on the anatomical and biomechanical characteristics of the wrist and combining the physical and chemical properties of PEEK materials, we prepared a PEEK lunate prosthesis by 3D printing and injection molding to substitute the necrotic lunate bone. A hotspot issue in the recent years has been how to fabricate the implants with a precise anatomical structure by combining 3D printing technology, and some clinical cases of PEEK prosthesis implantation have been reported. It is an ideal material for prosthesis fabrication, thus, it is more suitable for preparing human bone tissue scaffolds and joint prostheses. It can maintain stable physical and chemical properties under the stimulation of various chemical and physical conditions. Genotoxicity test results show that PEEK does not cause any chromosome aberration. PEEK has good biocompatibility and biological inertia. In the 1990s, as a substitute for metal implants, PEEK was increasingly used in the field of orthopedics. Compared with traditional metal materials, the elastic modulus of PEEK is closer to that of human cortical bone, and it has good plasticity. Polyether ether ketone (PEEK) is a special thermoplastic polymer, which has the advantages of high strength, high stiffness, corrosion resistance, and hydrolysis resistance. There are no uniform surgical procedures for Kienböck’s disease, and revascularization, biomechanical therapy, lunate resection and substitute implantation are all commonly used in clinical practice, but they have varying efficacy. Stage III Kienböck’s disease is clinically characterized by lunate rupture, necrosis, atrophy and flattening, and its treatment aims to conserve normal structure, restore movement function, and relieve wrist symptoms. Kienböck’s disease is one of the main causes for wrist pain and movement limitation.
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