Author:
Guo Minzheng,Qi Baochuang,Li Jun,Shi Xiangwen,Ni Haonan,Shi Hongxin,Ren Junxiao,Zhou Xizong,Ye Tao,Yao Ling,Xu Yongqing,Zhang Meichao,Li Chuan
Abstract
Abstract
Objective
Ni-Ti memory alloys are unusual materials for hard-tissue replacement because of their unique superelasticity, good biocompatibility, high strength, low specific gravity, low magnetism, wear resistance, corrosion resistance and fatigue resistance. The current study aims to evaluate its mechanical properties and provide biomechanical basis for the clinical application of the prosthesis.
Methods
Ten adult metacarpophalangeal joint specimens were randomly divided into a prosthesis group (n = 5, underwent metacarpophalangeal joint prosthesis) and a control group (n = 5, underwent sham operation). Firstly, the axial compression strength was tested with BOSE material testing machine to evaluate its biomechanical strength. Secondly, these specimens were tested for strain changes using BOSE material testing machine and GOM non-contact optical strain measurement system to evaluate the stress changes. Thirdly, fatigue test was performed between groups. Lastly, the mechanical wear of the metacarpophalangeal joint prosthesis was tested with ETK5510 material testing machine to study its mechanical properties.
Results
Axial compression stiffness in the prosthesis group was greater than that in the control group in terms of 30 ° and 60 ° flexion positions (P < 0.05). There was no statistically significant difference between two groups with regards to axial compression stiffness and stress change test (P > 0.05). In the fatigue wear test, the mean mass loss in the prosthesis group’s prosthesis was 17.2 mg and 17.619 mm3, respectively. The mean volume wear rate was 0.12%. There was no statistically significant difference in the maximum pull-out force of the metacarpal, phalangeal, and polymer polyethylene pads between the prosthesis group and the control group specimens.
Conclusions
Ni-Ti memory alloy metacarpophalangeal joint prosthesis conforms to the biomechanical characteristics of metacarpophalangeal joints without implants, and the fatigue strength can fully meet the needs of metacarpophalangeal joint activities after joint replacement.
Publisher
Springer Science and Business Media LLC
Subject
Orthopedics and Sports Medicine,Rheumatology
Reference28 articles.
1. Martin AS, Awan HM. Metacarpophalangeal arthroplasty for Osteoarthritis. J Hand Surg. 2015;40(9):1871–2.
2. Burke FD. The rheumatoid metacarpophalangeal joint. Hand Clin. 2011;27(1):79–86.
3. Earp B, Cefalu C, Blazar P. Thumb Metacarpophalangeal Joint Arthritis. J Am Acad Orthop Surg. 2019;27(23):e1029–e39.
4. Langer M, Grünert J, Ueberberg J, Unglaub F, Spies CK, Oeckenpöhler S. [Extensor tendon injuries of fingers in the region of the metacarpophalangeal joint (zone V)]. Der Unfallchirurg. 2021;124(4):275–86.
5. Spies CK, Langer MF, Löw S, Oppermann J, Hohendorff B, Müller LP, et al. [Metacarpophalangeal joint replacement]. Der Orthopade. 2019;48(5):386–93.