Biomechanics of Internal Fixation Modalities for Middle Phalangeal Base Fracture Dislocation
| Autor: | Gen-Lin Foo, Alphonsus Kin-Sze Chong, Amit K. Ramruttun, Andre E. J. Cheah, Tun-Lin Foo |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Buttress
medicine.medical_treatment Bone Screws Osteotomy 03 medical and health sciences Finger Phalanges Fracture Fixation Internal 0302 clinical medicine Tensile Strength Ultimate tensile strength Materials Testing medicine Cadaver Internal fixation Humans 030212 general & internal medicine Orthodontics 030222 orthopedics business.industry Fracture Dislocation Biomechanics General Medicine Anatomy Stress Mechanical Dislocation Cadaveric spasm Interphalangeal Joint business Bone Plates |
| Zdroj: | The journal of hand surgery Asian-Pacific volume. 22(1) |
| ISSN: | 2424-8363 |
| Popis: | Background: Internal fixation modalities of unstable (>50 percent articular involvement) middle phalangeal volar lip fracture-dislocations include interfragmentary screw and volar buttress plating. This study investigates the mechanical properties (yield strength, ultimate tensile strength, and stiffness) of interfragmentary screw (IS), simple buttress plating (BP) and buttress plating with subchondral screw (BP+S). Methods: Fifteen cadaveric digits (5 index, 5 middle, and 5 ring) were prepared by excising its skin envelope and flexor tendons while preserving the structures around the proximal interphalangeal joint. An oblique osteotomy involving 50 percent of the articular surface was performed, and this was fixed with based on its study group: interfragmentary screw (IS), simple buttress plating (BP) and buttress plating with subchondral screw (BP+S). These specimens were then loaded to failure. Results: Yield strength was as follows: BP+S (33.5±9.76 N), IS (13.6±5.46 N), and BP (8.1±3.84 N). Ultimate tensile strength was as follows: BP+S (49.1±21.4 N), IS (15.6±5.19 N), and BP (8.86±3.99 N). Stiffness was as follows: BP+S (4.77±1.32 N/mm), IS (2.44±0.86 N/mm), and BP (1.84±0.71 N/mm). Conclusions: A buttress plate and screw construct confers significantly more stability than either interfragmentary screw or buttress plate only fixation in an experimental model. |
| Databáze: | OpenAIRE |
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