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Yu H, Xu M, Duan Q, Li Y, Liu Y, Song L, Cheng L, Ying J, Zhao D. 3D-printed porous tantalum artificial bone scaffolds: fabrication, properties, and applications. Biomed Mater 2024; 19:042002. [PMID: 38697199 DOI: 10.1088/1748-605x/ad46d2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 05/01/2024] [Indexed: 05/04/2024]
Abstract
Porous tantalum scaffolds offer a high degree of biocompatibility and have a low friction coefficient. In addition, their biomimetic porous structure and mechanical properties, which closely resemble human bone tissue, make them a popular area of research in the field of bone defect repair. With the rapid advancement of additive manufacturing, 3D-printed porous tantalum scaffolds have increasingly emerged in recent years, offering exceptional design flexibility, as well as facilitating the fabrication of intricate geometries and complex pore structures that similar to human anatomy. This review provides a comprehensive description of the techniques, procedures, and specific parameters involved in the 3D printing of porous tantalum scaffolds. Concurrently, the review provides a summary of the mechanical properties, osteogenesis and antibacterial properties of porous tantalum scaffolds. The use of surface modification techniques and the drug carriers can enhance the characteristics of porous tantalum scaffolds. Accordingly, the review discusses the application of these porous tantalum materials in clinical settings. Multiple studies have demonstrated that 3D-printed porous tantalum scaffolds exhibit exceptional corrosion resistance, biocompatibility, and osteogenic properties. As a result, they are considered highly suitable biomaterials for repairing bone defects. Despite the rapid development of 3D-printed porous tantalum scaffolds, they still encounter challenges and issues when used as bone defect implants in clinical applications. Ultimately, a concise overview of the primary challenges faced by 3D-printed porous tantalum scaffolds is offered, and corresponding insights to promote further exploration and advancement in this domain are presented.
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Affiliation(s)
- Haiyu Yu
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Minghao Xu
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Qida Duan
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Yada Li
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Yuchen Liu
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Liqun Song
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Liangliang Cheng
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Jiawei Ying
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
| | - Dewei Zhao
- Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, No. 6 Jiefang St, Dalian, Liaoning 116001, People's Republic of China
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Gong T, Lu M, Wang J, Zhang Y, Wang Y, Tang F, Li Z, Zhou Y, Min L, Luo Y, Tu C. 3D-Printed Modular Endoprosthesis Reconstruction Following Total Calcanectomy in Calcaneal Malignancy. Foot Ankle Int 2023; 44:1021-1029. [PMID: 37542414 DOI: 10.1177/10711007231185334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/07/2023]
Abstract
BACKGROUND The use of 3D-printed endoprosthesis has been proposed as a viable limb-salvage procedure following total calcanectomy in patients with calcaneal malignancy. However, certain drawbacks persist concerning the prosthetic design. In this case series, we designed a modular endoprosthesis incorporating a novel drainage system, aiming to improve the functional outcomes and to promote wound healing. METHODS We retrospectively analyzed patients with calcaneal malignancy who underwent 3D-printed modular endoprosthesis reconstruction. Clinically, we evaluated functional outcomes using the 10-cm visual analog scale (VAS) score, the 1993 version of the Musculoskeletal Tumor Society (MSTS-93) score, and the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score. Complications were also recorded. RESULTS Five male patients met the final inclusion criteria. The median age was 20 years (range 13-47 years). The median follow-up time was 28 months (range, 13-65 months). Median postoperative functional MSTS-93, VAS, and AOFAS scores were 27 points (range, 25-29), 0 points (range, 0-1), and 86 points (range, 83-93), respectively. Wound healing was observed in all patients, and there were no complications related to the endoprosthesis at the last follow-up. CONCLUSION The use of 3D-printed modular endoprosthesis was associated with satisfactory short-term outcomes in patients undergoing calcaneal reconstruction. The incorporation of a novel design featuring an integrated draining system has the potential to enhance wound healing and expedite functional recovery. LEVEL OF EVIDENCE Level IV, case series.
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Affiliation(s)
- Taojun Gong
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Minxun Lu
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Jie Wang
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Yuqi Zhang
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Yitian Wang
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Fan Tang
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Zhuangzhuang Li
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Yong Zhou
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Li Min
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Yi Luo
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
| | - Chongqi Tu
- Department of Orthopedics, Orthopaedic Research Institute, West China Hospital, Sichuan University, Chengdu, People's Republic of China
- Model Worker and Craftsman Talent Innovation Workshop of Sichuan province, Chengdu, Sichuan, People's Republic of China
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Moiduddin K, Mian SH, Elseufy SM, Alkhalefah H, Ramalingam S, Sayeed A. Polyether-Ether-Ketone (PEEK) and Its 3D-Printed Quantitate Assessment in Cranial Reconstruction. J Funct Biomater 2023; 14:429. [PMID: 37623673 PMCID: PMC10455463 DOI: 10.3390/jfb14080429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 07/31/2023] [Accepted: 08/14/2023] [Indexed: 08/26/2023] Open
Abstract
Three-dimensional (3D) printing, medical imaging, and implant design have all advanced significantly in recent years, and these developments may change how modern craniomaxillofacial surgeons use patient data to create tailored treatments. Polyether-ether-ketone (PEEK) is often seen as an attractive option over metal biomaterials in medical uses, but a solid PEEK implant often leads to poor osseointegration and clinical failure. Therefore, the objective of this study is to demonstrate the quantitative assessment of a custom porous PEEK implant for cranial reconstruction and to evaluate its fitting accuracy. The research proposes an efficient process for designing, fabricating, simulating, and inspecting a customized porous PEEK implant. In this study, a CT scan is utilized in conjunction with a mirrored reconstruction technique to produce a skull implant. In order to foster cell proliferation, the implant is modified into a porous structure. The implant's strength and stability are examined using finite element analysis. Fused filament fabrication (FFF) is utilized to fabricate the porous PEEK implants, and 3D scanning is used to test its fitting accuracy. The results of the biomechanical analysis indicate that the highest stress observed was approximately 61.92 MPa, which is comparatively low when compared with the yield strength and tensile strength of the material. The implant fitting analysis demonstrates that the implant's variance from the normal skull is less than 0.4436 mm, which is rather low given the delicate anatomy of the area. The results of the study demonstrate the implant's endurance while also increasing the patient's cosmetic value.
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Affiliation(s)
- Khaja Moiduddin
- Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia
| | - Syed Hammad Mian
- Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia
| | | | - Hisham Alkhalefah
- Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia
| | - Sundar Ramalingam
- Department of Oral and Maxillofacial Surgery, College of Dentistry and Dental University Hospital, King Saud University Medical City, Riyadh 11545, Saudi Arabia
| | - Abdul Sayeed
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
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Golubchikov D, Evdokimov P, Zuev D, Filippov Y, Shatalova T, Putlayev V. Three-Dimensional-Printed Molds from Water-Soluble Sulfate Ceramics for Biocomposite Formation through Low-Pressure Injection Molding. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3077. [PMID: 37109912 PMCID: PMC10145792 DOI: 10.3390/ma16083077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/01/2023] [Accepted: 04/10/2023] [Indexed: 06/19/2023]
Abstract
Powder mixtures of MgSO4 with 5-20 mol.% Na2SO4 or K2SO4 were used as precursors for making water-soluble ceramic molds to create thermoplastic polymer/calcium phosphate composites by low pressure injection molding. To increase the strength of the ceramic molds, 5 wt.% of tetragonal ZrO2 (Y2O3-stabilized) was added to the precursor powders. A uniform distribution of ZrO2 particles was obtained. The average grain size for Na-containing ceramics ranged from 3.5 ± 0.8 µm for MgSO4/Na2SO4 = 91/9% to 4.8 ± 1.1 µm for MgSO4/Na2SO4 = 83/17%. For K-containing ceramics, the values were 3.5 ± 0.8 µm for all of the samples. The addition of ZrO2 made a significant contribution to the strength of ceramics: for the MgSO4/Na2SO4 = 83/17% sample, the compressive strength increased by 49% (up to 6.7 ± 1.3 MPa), and for the stronger MgSO4/K2SO4 = 83/17% by 39% (up to 8.4 ± 0.6 MPa). The average dissolution time of the ceramic molds in water did not exceed 25 min.
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Affiliation(s)
- Daniil Golubchikov
- Department of Materials Science, Lomonosov Moscow State University, Building, 73, Leninskie Gory, 1, 119991 Moscow, Russia; (D.Z.); (T.S.); (V.P.)
- Department of Chemistry, Lomonosov Moscow State University, Building, 3, Leninskie Gory, 1, 119991 Moscow, Russia; (P.E.); (Y.F.)
| | - Pavel Evdokimov
- Department of Chemistry, Lomonosov Moscow State University, Building, 3, Leninskie Gory, 1, 119991 Moscow, Russia; (P.E.); (Y.F.)
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii Prosp., 31, 119071 Moscow, Russia
| | - Dmitry Zuev
- Department of Materials Science, Lomonosov Moscow State University, Building, 73, Leninskie Gory, 1, 119991 Moscow, Russia; (D.Z.); (T.S.); (V.P.)
| | - Yaroslav Filippov
- Department of Chemistry, Lomonosov Moscow State University, Building, 3, Leninskie Gory, 1, 119991 Moscow, Russia; (P.E.); (Y.F.)
- Research Institute of Mechanics, Lomonosov Moscow State University, Michurinsky, 1, 119192 Moscow, Russia
| | - Tatiana Shatalova
- Department of Materials Science, Lomonosov Moscow State University, Building, 73, Leninskie Gory, 1, 119991 Moscow, Russia; (D.Z.); (T.S.); (V.P.)
- Department of Chemistry, Lomonosov Moscow State University, Building, 3, Leninskie Gory, 1, 119991 Moscow, Russia; (P.E.); (Y.F.)
| | - Valery Putlayev
- Department of Materials Science, Lomonosov Moscow State University, Building, 73, Leninskie Gory, 1, 119991 Moscow, Russia; (D.Z.); (T.S.); (V.P.)
- Department of Chemistry, Lomonosov Moscow State University, Building, 3, Leninskie Gory, 1, 119991 Moscow, Russia; (P.E.); (Y.F.)
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Is three-dimension-printed mesh scaffold an alternative to reconstruct cavity bone defects near joints? INTERNATIONAL ORTHOPAEDICS 2023; 47:631-639. [PMID: 36629849 DOI: 10.1007/s00264-022-05684-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 12/27/2022] [Indexed: 01/12/2023]
Abstract
PURPOSE Reconstruction of cavity bone defects after curettage of benign bone tumours around the joint remains challenging. We designed a novel 3D-printed mesh scaffold as a substitute for bone cement, aiming to support the articular surface, protect the subchondral bone, and reduce complication rates. METHODS We retrospectively analyzed seven patients who received curettage and reconstruction using a 3D-printed mesh scaffold between January 2020 and June 2021. Pain and function were evaluated using the 10-cm Visual Analogue Scale (VAS) score and the 1993 version of the Musculoskeletal Tumor Society (MSTS-93) score. Radiographs were used to evaluate articular surface supporting, subchondral bone protection, and complications. RESULTS The median functional MSTS-93 and VAS scores were both improved after surgery, and the median 3D-printed mesh scaffold volume was smaller than the median defect volume. Articular surface supporting, subchondral bone preservation, and osteogenesis were observed post-operatively. No related complications were observed during the last follow-up. CONCLUSIONS The 3D-printed mesh scaffold provided sufficient mechanical support for the articular surface and protected the subchondral bone. We recommended the 3D-printed mesh structure as an alternative to repair cavity bone defects around joints.
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Ren Z, Li L, Xu F, Xu J, Lai F. Design and mechanical properties of cervical fusion cage based on porous entangled metal rubber material. J Biomater Appl 2023; 37:1029-1041. [PMID: 36533989 DOI: 10.1177/08853282221146692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Titanium and its alloys are one of the mainstream materials for the manufacture of intervertebral cages. With the application on clinical, the problems of elastic modulus is relatively high, subsidence of adjacent vertebral implants and stress shielding after surgery have gradually exposed. In this paper, metal rubber made from titanium alloy wire was used to prepare cervical fusion cage (CFC), which was a porous material with buffering and vibration damping properties. The C5/C6 segment of the goat cervical vertebra was used as the research object. The shape parameters of the CFC were determined by combining the three-dimensional model data of the cervical vertebra and the structural characteristics of the natural intervertebral disc. The force of CFC under different working conditions were simulated and analyzed by finite element simulation. Then three kinds of metal rubber core (MRC) were prepared by medical titanium alloy wire (TC4), and their mechanical properties and fatigue strength were experimentally studied. With the increases of density, the mechanical properties of MRC improved. The variation range of the loss factor η under different amplitudes and frequencies were 20% and 16.3%, respectively. After one million vibrations, the wear rate was 0.131 g/MC; after five million vibrations, the wear rate was 0.158 g/MC, which was similar to the existing clinical prosthesis wear rate. The MRC has sufficient mechanical strength. Compared with the existing clinical prostheses, it has a longer service life and has broad application prospects.
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Affiliation(s)
- Zhiying Ren
- School of Mechanical Engineering and Automation, Institute of Metal Rubber and Vibration Noise, 12423Fuzhou University, Fuzhou China
| | - Linlin Li
- School of Mechanical Engineering and Automation, Institute of Metal Rubber and Vibration Noise, 12423Fuzhou University, Fuzhou China
| | - Fangqi Xu
- School of Mechanical Engineering and Automation, Institute of Metal Rubber and Vibration Noise, 12423Fuzhou University, Fuzhou China
| | - Jie Xu
- 117861Fujian Provincial Hospital, Fuzhou, China
| | - Fuqiang Lai
- School of Mechanical Engineering and Automation, Institute of Metal Rubber and Vibration Noise, 12423Fuzhou University, Fuzhou China
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Yokoi T, Mio A, Nakamura J, Sugawara-Narutaki A, Kawashita M, Ohtsuki C. Transformation behaviour of salts composed of calcium ions and phosphate esters with different linear alkyl chain structures in a simulated body fluid modified with alkaline phosphatase. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2022; 23:341-351. [PMID: 35693889 PMCID: PMC9176335 DOI: 10.1080/14686996.2022.2074801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/28/2022] [Accepted: 05/03/2022] [Indexed: 06/15/2023]
Abstract
Ceramic biomaterials have been used for the treatment of bone defects and have stimulated intense research on such materials. We have previously reported that a salt composed of calcium ions and a phosphate ester (SCPE) transformed into hydroxyapatite (HAp) in a simulated body fluid (SBF) modified with alkaline phosphatase (ALP), and proposed SCPEs as a new category of ceramic biomaterials, namely bioresponsive ceramics. However, the factors that affect the transformation of SCPEs to HAp in the SBF remained unclear. Therefore, in this study, we investigated the behaviour of calcium salts of methyl phosphate (CaMeP), ethyl phosphate (CaEtP), butyl phosphate (CaBuP), and dodecyl phosphate (CaDoP) in SBF with and without ALP modification. For the standard SBF, an X-ray diffraction (XRD) analysis indicated that these SCPEs did not readily transform into calcium phosphate. However, CaMeP, CaEtP, and CaBuP were transformed into HAp and octacalcium phosphate in the SBF modified with ALP; therefore, these SCPEs can be categorised as bioresponsive ceramics. Although CaDoP did not exhibit a sufficient response to ALP to be detected by XRD, it is likely to be a bioresponsive ceramic based on the results of morphological observations. The transformation rate for the SCPEs decreased with increasing size of the linear alkyl group of the phosphate esters. The rate-determining steps for the transformation reaction of the SCPEs were changed from the dissolution of the SCPEs to the hydrolysis of the phosphate esters with increasing size of the phosphate ester alkyl groups. These findings contribute to designing novel bioresponsive ceramic biomaterials.
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Affiliation(s)
- Taishi Yokoi
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Akiyoshi Mio
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Jin Nakamura
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | | | - Masakazu Kawashita
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Chikara Ohtsuki
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
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Metallic Implants Used in Lumbar Interbody Fusion. MATERIALS 2022; 15:ma15103650. [PMID: 35629676 PMCID: PMC9146470 DOI: 10.3390/ma15103650] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 02/07/2023]
Abstract
Over the last decade, pedicle fixation systems have evolved and modifications in spinal fusion techniques have been developed to increase fusion rates and improve clinical outcomes after lumbar interbody fusion (LIF). Regarding materials used for screw and rod manufacturing, metals, especially titanium alloys, are the most popular resources. In the case of pedicle screws, that biomaterial can be also doped with hydroxyapatite, CaP, ECM, or tantalum. Other materials used for rod fabrication include cobalt-chromium alloys and nitinol (nickel-titanium alloy). In terms of mechanical properties, the ideal implant used in LIF should have high tensile and fatigue strength, Young's modulus similar to that of the bone, and should be 100% resistant to corrosion to avoid mechanical failures. On the other hand, a comprehensive understanding of cellular and molecular pathways is essential to identify preferable characteristics of implanted biomaterial to obtain fusion and avoid implant loosening. Implanted material elicits a biological response driven by immune cells at the site of insertion. These reactions are subdivided into innate (primary cellular response with no previous exposure) and adaptive (a specific type of reaction induced after earlier exposure to the antigen) and are responsible for wound healing, fusion, and also adverse reactions, i.e., hypersensitivity. The main purposes of this literature review are to summarize the physical and mechanical properties of metal alloys used for spinal instrumentation in LIF which include fatigue strength, Young's modulus, and corrosion resistance. Moreover, we also focused on describing biological response after their implantation into the human body. Our review paper is mainly focused on titanium, cobalt-chromium, nickel-titanium (nitinol), and stainless steel alloys.
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Abstract
Ti-6Al-4V (Ti64) alloy is one of the most widely used orthopedic implant materials due to its mechanical properties, corrosion resistance, and biocompatibility nature. Porous Ti64 structures are gaining more research interest as bone implants as they can help in reducing the stress-shielding effect when compared to their solid counterpart. The literature shows that porous Ti64 implants fabricated using different additive manufacturing (AM) process routes, such as laser powder bed fusion (L-PBF) and electron beam melting (EBM) can be tailored to mimic the mechanical properties of natural bone. This review paper categorizes porous implant designs into non-gradient (uniform) and gradient (non-uniform) porous structures. Gradient porous design appears to be more promising for orthopedic applications due to its closeness towards natural bone morphology and improved mechanical properties. In addition, this paper outlines the details on bone structure and its properties, mechanical properties, fatigue behavior, multifunctional porous implant designs, current challenges, and literature gaps in the research studies on porous Ti64 bone implants.
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Three-dimensional-printed titanium implants for severe acetabular bone defects in revision hip arthroplasty: short- and mid-term results. INTERNATIONAL ORTHOPAEDICS 2022; 46:1289-1297. [PMID: 35384469 DOI: 10.1007/s00264-022-05390-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 03/27/2022] [Indexed: 12/15/2022]
Abstract
PURPOSE Severe acetabular bone defect is challenging in revision hip arthroplasty. In the present study, we aimed to present new treatment options with the 3D printing technique and analyze the clinical and radiographic outcomes of 3D-printed titanium implants for the treatment of severe acetabular bone defects in revision hip arthroplasty. METHODS A total of 35 patients with Paprosky type 3 bone defect and pelvic discontinuity (PD), who underwent hip revisions using 3D-printed titanium implants between 2016 and 2019 at our institution, were retrospectively reviewed. Patient-specific 3D-printed titanium augments and shells (strategy A) were used in 22 type 3A and two type 3B patients. Custom 3D-printed flanged components (strategy B) were used in 11 type 3B patients, including five PD. The clinical outcomes were evaluated with the Harris hip score (HHS). In addition, radiographic results were analyzed by the hip centre of rotation (V-COR and H-COR), implant failure, and survivorship. RESULTS The mean follow-up was 41.5 months (range, 16-62). The HHS was improved from 47.8 ± 8.2 pre-operatively to 78.1 ± 10.1 at one year follow-up and 86.4 ± 5.1 at the last follow-up (p < 0.01). Post-operative V-COR and H-COR of the operated side were 20.8 ± 2.0 mm and 30.2 ± 1.6 mm compared with 51.4 ± 4.1 mm and 33.9 ± 9.0 mm pre-operatively (p < 0.01). The complications included one dislocation and one partial palsy of the sciatic nerve. At the latest follow-up, no radiological component loosening or screw breakage was present. CONCLUSIONS 3D-printed titanium implants showed satisfactory short- and mid-term clinical and radiographic outcomes. It was an effective therapeutic regimen with a low rate of complications, providing a patient-specific and reliable strategy for the severe acetabular bone defect in revision hip arthroplasty.
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Jiang T, Yang T, Bao Q, Sun W, Yang M, Mao C. Construction of tissue-customized hydrogels from cross-linkable materials for effective tissue regeneration. J Mater Chem B 2021; 10:4741-4758. [PMID: 34812829 DOI: 10.1039/d1tb01935j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hydrogels are prevalent scaffolds for tissue regeneration because of their hierarchical architectures along with outstanding biocompatibility and unique rheological and mechanical properties. For decades, researchers have found that many materials (natural, synthetic, or hybrid) can form hydrogels using different cross-linking strategies. Traditional strategies for fabricating hydrogels include physical, chemical, and enzymatical cross-linking methods. However, due to the diverse characteristics of different tissues/organs to be regenerated, tissue-customized hydrogels need to be developed through precisely controlled processes, making the manufacture of hydrogels reliant on novel cross-linking strategies. Thus, hybrid cross-linkable materials are proposed to tackle this challenge through hybrid cross-linking strategies. Here, different cross-linkable materials and their associated cross-linking strategies are summarized. From the perspective of the major characteristics of the target tissues/organs, we critically analyze how different cross-linking strategies are tailored to fit the regeneration of such tissues and organs. To further advance this field, more appropriate cross-linkable materials and cross-linking strategies should be investigated. In addition, some innovative technologies, such as 3D bioprinting, the internet of medical things (IoMT), and artificial intelligence (AI), are also proposed to improve the development of hydrogels for more efficient tissue regeneration.
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Affiliation(s)
- Tongmeng Jiang
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Tao Yang
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Qing Bao
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
| | - Weilian Sun
- Department of Periodontology, The Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310009, P. R. China.
| | - Mingying Yang
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, Zhejiang 310058, P. R. China.
| | - Chuanbin Mao
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA.
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