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Mean variations of up to 32. 5% for strains and 14. 1 percent for the bending moment in Swanson's implant were found in both models, and 14. 1 percent for bending time, respectively, were found in Tornier implant mean variations of 29. 73% and 62. 5 percent, respectively, for stress and bending moment. The maximum stress value obtained for the Swanson implant's hyperelastic model displayed a value of 22. 8 percent of the implant's tensile strength, while in the Tornier implant reached a value of 25. 92 percent, according to the above values at a flexion angle of 64 degrees. To prevent dismissing the non-linear structure of hyperelastic materials, consider the following findings: Not only the stress state designed to establish a pivotal flexion position in pleflexed implant models but also the silicone for implants' hyperelastic material behavior to prevent missing the non-linear structural behavior of hyperelastic materials in finite element analyses.
Source link: https://doi.org/10.1177/09544119221093473
The hallux rigidus is a term used to describe a mobility restriction of the big toe's metatarsophalangeal joint due to osteoarthritic degeneration. During cadaveric studies, the cartilaginous erosion of the metatarsal head and / or the base of the phalange, as well as the dorsal osteophyte of the first metatarsal were discovered. Hypothesis: Arthroscopic debridement of the first metatarsophalangeal joint raises the early postoperative clinical outcome compared to isolated percutaneous therapy.
Source link: https://doi.org/10.55453/rjmm.2018.121.3.6
This report investigated the correlation between arthritis of the second MTP joint in hallux valgus patients and the association of arthritis of the second MTP joint and hallux valgus deformity. Methods: A total of 382 patients underwent surgical treatment for symptomatic hallux valgus deformities by the two senior authors from November 2011 to December 2012. Osteoarthritis patients were then evaluated and classified according to joint space narrowing and osteophyte formation. The first metatarsal bone lengths were determined by a statistical investigation to compare the two groups in terms of their hallux valgus angle, intermetatarsal angle, distal metatarsal articular angle, hypermobility of the first metatarsal bone, the length of the second metatarsal bone, and the length ratio of the first and second metatarsal bones. Results: The IMA of the OA group was 16. 2 2. 9 degrees, and NOA's was 15. 4 3. 3 degrees. The OAOA's DMAA was 18. 2 8. 3 degrees, and NOA group's was 16. 1 8. 0 degrees. In terms of the HVA, hypermobility, the length of the second metatarsal bone, and the length ratios of the second and first metatarsal bones, there were no significant differences between the two groups. A positive correlation was found between the HVA and the severity of osteoarthritis in the OA group. In addition, there were no positive correlations between the DMAA, the length of the second metatarsal bone, and the metatarsal length ratio.
Source link: https://doi.org/10.1177/1071100714552478
OBJECTIVE—To determine the safety and effectiveness of first metatarsophalangeal joint arthroplasty in patients with diabetes in comparison to non-surgical wound care at the plantar hallux interphalangeal joint. DESIGN AND METHODS—We surveyed 41 patients with ulcers classed University of Texas Grade 1A or 2A at the plantar portion of the first metatarsophalangeal joint using a case-control system.
Source link: https://doi.org/10.2337/diacare.26.12.3284
This paper was designed to investigate radiographic indicators for evaluating congruency of the first MTP joint. Methods We selected patients with hallux valgus who had an outpatient clinic X-ray and determined their hallux valgus angle. The higher the degree of hallux valgus was the greater the degree of incompatibility of the first MTP joint, according to the investigators. In the DMAA, MTPJA, and CI, there were significant differences between the congruency and incongruency groups of patients with moderate to severe hallux valgus. The DMAA and HVA were positively linked in the congruence group, according to the correlation test, but the MTPJA, CI, and HVA had poor correlation coefficients. The DMAA and HVA were not correlated in the incongruence group, however, the MTPJA and HVA were highly correlated, and the CI and HVA showed a negative correlation P.
Source link: https://doi.org/10.1186/s13018-022-03028-1
Nevertheless, there is no evidence of the first metatarsophalangeal and first metatarsocuneiform joint contact mechanics. Our aim was to provide a framework for FE simulation of the medial forefoot that could accurately predict experimental results of first MTP and first MTC joint loadings. For the first MTP and first MTC joint cartilage, Mesh sensitivity tests and best-fit calibrations of moduli were carried out. Both MTP and 20 MPa were best-fit to the first MTP, according to a lower compressive modulus, consistent with previous experimental results. Mean errors in contact pressures, forces, and areas at the first MTC joint, respectively, stood at 24%, 12%, and 19% at the first MTC joint, respectively. The current developmental framework may be used to determine future modelling of first MTP and first MTC joint contact mechanics.
Source link: https://doi.org/10.1115/1.4053791
History: Minimally invasive surgery for the treatment of hallux valgus deformities has become more popular. For surgeons planning and executing extracapsular corrective osteotomies, surgeons need to know where the hallux metatarsophalangeal proximal capsular origin on the metatarsal neck is located. The mean distances from the central hallux metatarsal head to the MTP capsular origins were 15. 2 mm dorsally, 8. 4 mm medially, 9. 6 mm plantarmedially, and 21. 0 mm plantarlaterally, according to 17. 3 mm plantarlaterally, and 21. 0 mm plantarlaterally. MTP capsular origins of the hallux metatarsal varies at various anatomic locations, according to MTP's conclusion.
Source link: https://doi.org/10.1177/10711007211027262
Multiple surgical solutions have been outlined to handle persistent dorsiflexion contracture at the metatarsophalangeal joint and plantarflexion contracture at the fifth toe's proximal interphalangeal joint. We perform a plantar closing wedge osteotomy of the 5th toe at the base of the proximal phalanx of the 5th toe as part of a lateral congylectomy of the proximal phalanx and the middle phalanx.
Source link: https://doi.org/10.4081/std.2011.e27
The deformity of the valgus deformity in a modern sequel to spastic cerebral palsy. Methods Twenty ambulatory patients with hallux valgus deformity, with painful forefoot and restricted footwear, secondary to spastic cerebral palsy that occurred perinatally were treated with high toe metatarsophalangeal arthrodesis using percutaneous K-wires for fixation. Through arthrodesis, the patients had a stable painless alignment, with 0-10° valgus, 20° dorsiflexion, and neutral rotation after arthrodesis, as well as a significant improvement in the MTP and the intermetatarsal angles by postoperative radiographs. In a single case, superficial wound slough was present. Conclusion In adolescents with spastic cerebral palsy, the best MTP arthrodesis can help reduce segmental foot malalignment and dynamic foot deviation.
Source link: https://doi.org/10.1007/s11832-008-0147-4
History: The loss of MTP joint mobility and pain is characteristic of arthritis of the metatarsophalangeal joint. The aim was to determine the sagittal kinematics and articulated contact properties of four different first metatarsal head designs of an MTP joint implant, using cadaveric model. Methods: Six cadaveric feet were each covered with a single modular first MTP joint total arthroplasty. Data was compared to the native joint in comparison to 4 distinct reconstructed cases. Each reconstructed joint used a different metatarsal-head component when reusing the same phalangeal unit to compare the 4 alternative metatarsal head designs. Results: All repaired joints demonstrated increased ROM compared to the original joint. All repaired joints had contact areas that were lower than the original ones. Conclusions: In this review of a first metatarsophalangeal joint replacement scheme, ROM was found to be more suitable for the more anatomically developed metatarsal head, although contact properties did not differ between different styles.
Source link: https://doi.org/10.1177/1071100713483096
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