The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hideo Kawai - One of the best experts on this subject based on the ideXlab platform.
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Replacement of the first metatarsophalangeal joint with a Swanson implant accompanied by open-wedge osteotomy of the first Metatarsal Bone for hallux valgus in rheumatoid arthritis
Modern Rheumatology, 2007Co-Authors: Kenji Hayashida, Hajime Owaki, Hideo KawaiAbstract:Hallux valgus is very common in rheumatoid arthritis (RA) and mostly accompanied by varus deformity of the first Metatarsal Bone, which is often corrected in surgeries for hallux valgus in nonarthritic condition, but rarely in RA. We performed the replacement of the first metatarsophalangeal (MTP) joint with a Swanson hinge toe implant accompanied with open-wedge osteotomy of the first Metatarsal Bone, aiming at reconstruction of a functioning first MTP joint without recurrence of hallux valgus. Fifteen feet of 11 patients with RA were studied with a mean follow-up period of 45.1 months. The American Orthopaedic Foot and Ankle Society (AOFAS) scale improved significantly from 39 points preoperatively to 81.7 at the last follow-up. The hallux valgus angle (HVA), angle between the first and second Metatarsal Bones (M1/2), and that between the first and fifth (M1/5), measured on standing anteroposterior radiographs, decreased significantly from 49.8°, 16.7°, and 34.4° preoperatively to 10.9°, 8.7°, and 22.2° at the last follow-up, respectively. Union of the corrected first Metatarsal Bone was recognized in all cases and no such problems as infection, dislocation, or implant fracture were observed. These data suggest that replacement of the first MTP joint with a Swanson implant accompanied with open-wedge osteotomy of the first Metatarsal Bone can be a useful option for hallux valgus in RA.
Marta Elena Losa Iglesias - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Stress Redistribution in the First Metatarsal Bone After Autologous Bone Harvesting.
Journal of the American Podiatric Medical Association, 2017Co-Authors: Javier Bayod López, Ricardo Becerro De Bengoa Vallejo, Marta Elena Losa Iglesias, Manuel DoblaréAbstract:Background: The first Metatarsal Bone is a viable source for autologous Bone grafting in foot and ankle surgery and may serve as another convenient graft site to correct a flail toe deformity. We a...
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Geometry of the Proximal Phalanx of Hallux and First Metatarsal Bone to Predict Hallux Abducto Valgus: A Radiological Study.
PLOS ONE, 2016Co-Authors: Eduardo Perez Boal, Ricardo Becerro De Bengoa Vallejo, Miguel Fuentes Rodriguez, Daniel López, Marta Elena Losa IglesiasAbstract:Background Hallux abducto valgus (HAV) is one of the most common forefoot deformities in adulthood with a variable prevalence but has been reported as high as 48%. The study proposed that HAV development involves a skeletal parameter of the first Metatarsal Bone and proximal phalanx hallux (PPH) to determine if the length measurements of the Metatarsal and PPH can be used to infer adult HAV. Methods All consecutive patients over 21 years of age with HAV by roentgenographic evaluation were included in a cross-sectional study. The control group included patients without HAV. The study included 160 individuals. We identified and assessed the following radiographic measurements to evaluate HAV: the distances from the medial (LDM), central (LDC), and lateral (LDL) aspects of the base to the corresponding regions of the head of the PPH. The difference between the medial and lateral aspect of PPH was also calculated. Results The reliability of the variables measured in 40 radiographic films show perfect reliability ranging from 0.941 to 1 with a small error ranging from 0.762 to 0. Also, there were no systematic errors between the two measurements for any variable (P > 0.05). The LDM PPH showed the highest reliability and lowest error. Conclusion It is more suitable to measure the LDM PPH instead of the LDC PPH when calculating the hallux valgus angle based on our reliability results. When the differences of the medial and lateral PPH are greater, the risk for developing HAV increases.
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stress at the second Metatarsal Bone after correction of hammertoe and claw toe deformity a finite element analysis using an anatomical model
Journal of the American Podiatric Medical Association, 2013Co-Authors: Javier Bayod, Ricardo Becerro De Bengoa Vallejo, Marta Elena Losa Iglesias, Manuel DoblaréAbstract:Background: We used finite element analysis to evaluate three techniques for the correction of hammertoe and claw toe deformities: flexor digitorum longus tendon transfer (FDLT), flexor digitorum brevis tendon transfer (FDBT), and proximal interphalangeal joint arthrodesis (PIPJA). Methods: We performed a finite element analysis of FDLT and FDBT compared with PIPJA of the second toe using multislice computed tomography and 93 tomographic images of the foot obtained in a healthy 36-year-old man. Results: The PIPJA showed a significantly higher increase in traction and compressive stresses and strain at the medial aspect of the shaft of the second Metatarsal Bone compared with FDLT or FDBT (P < .01). Mean ± SD compressive stresses increased to −4.35 ± 7.05 MPa compared with the nonsurgical foot (−3.10 ± 4.90 MPa). It can, therefore, be hypothesized that if PIPJA is used to correct the hammertoe and claw toe deformities, it could also increase traction and compressive stresses and strain in the Metatarsals d...
Kimmo Mattila - One of the best experts on this subject based on the ideXlab platform.
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the biomechanics of the first Metatarsal Bone in hallux valgus a preliminary study utilizing a weight bearing extremity ct
Foot and Ankle Surgery, 2013Co-Authors: Lauri Collan, Jussi Kankare, Kimmo MattilaAbstract:Abstract Background Hallux valgus is a common but aetiologically not perfectly understood condition. Imaging in hallux valgus is based on weight bearing plain radiographs or in exceptional cases on non-weight bearing computerized tomography (CT)-studies. Methods A portable extremity CT was used to study the forefoot with focus on first Metatarsal Bone in ten hallux valgus patients and five asymptomatic controls at rest and at weight bearing. Two-dimensional (2D) or three-dimensional (3D) hallux valgus angles, interMetatarsal angles and various other parameters were measured on CT data and the measurements between study groups were compared. The measured angles were also compared to angles measured on plain radiographs. Results 2D or 3D angles from CT data sets can be used to evaluate hallux valgus. In hallux valgus, when compared with normal asymptomatic foot, the first Metatarsal Bone is medially deviated (interMetatarsal angle is wider), the width of the forefoot is increased and the proximal phalanx pronates. Between the study groups there was a statistically significant difference of the measured 3D hallux valgus angles at weight bearing but not at rest suggesting the importance of weight bearing CT studies when evaluating hallux valgus. Conclusions To our knowledge, this is the first time weight bearing CT data is presented when evaluating hallux valgus, offering a true alternative to plain radiographs. The relationships of Bones of the forefoot, including rotational changes, can be reliably measured using this imaging method.
Kenji Hayashida - One of the best experts on this subject based on the ideXlab platform.
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Replacement of the first metatarsophalangeal joint with a Swanson implant accompanied by open-wedge osteotomy of the first Metatarsal Bone for hallux valgus in rheumatoid arthritis
Modern Rheumatology, 2007Co-Authors: Kenji Hayashida, Hajime Owaki, Hideo KawaiAbstract:Hallux valgus is very common in rheumatoid arthritis (RA) and mostly accompanied by varus deformity of the first Metatarsal Bone, which is often corrected in surgeries for hallux valgus in nonarthritic condition, but rarely in RA. We performed the replacement of the first metatarsophalangeal (MTP) joint with a Swanson hinge toe implant accompanied with open-wedge osteotomy of the first Metatarsal Bone, aiming at reconstruction of a functioning first MTP joint without recurrence of hallux valgus. Fifteen feet of 11 patients with RA were studied with a mean follow-up period of 45.1 months. The American Orthopaedic Foot and Ankle Society (AOFAS) scale improved significantly from 39 points preoperatively to 81.7 at the last follow-up. The hallux valgus angle (HVA), angle between the first and second Metatarsal Bones (M1/2), and that between the first and fifth (M1/5), measured on standing anteroposterior radiographs, decreased significantly from 49.8°, 16.7°, and 34.4° preoperatively to 10.9°, 8.7°, and 22.2° at the last follow-up, respectively. Union of the corrected first Metatarsal Bone was recognized in all cases and no such problems as infection, dislocation, or implant fracture were observed. These data suggest that replacement of the first MTP joint with a Swanson implant accompanied with open-wedge osteotomy of the first Metatarsal Bone can be a useful option for hallux valgus in RA.
Lauri Collan - One of the best experts on this subject based on the ideXlab platform.
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the biomechanics of the first Metatarsal Bone in hallux valgus a preliminary study utilizing a weight bearing extremity ct
Foot and Ankle Surgery, 2013Co-Authors: Lauri Collan, Jussi Kankare, Kimmo MattilaAbstract:Abstract Background Hallux valgus is a common but aetiologically not perfectly understood condition. Imaging in hallux valgus is based on weight bearing plain radiographs or in exceptional cases on non-weight bearing computerized tomography (CT)-studies. Methods A portable extremity CT was used to study the forefoot with focus on first Metatarsal Bone in ten hallux valgus patients and five asymptomatic controls at rest and at weight bearing. Two-dimensional (2D) or three-dimensional (3D) hallux valgus angles, interMetatarsal angles and various other parameters were measured on CT data and the measurements between study groups were compared. The measured angles were also compared to angles measured on plain radiographs. Results 2D or 3D angles from CT data sets can be used to evaluate hallux valgus. In hallux valgus, when compared with normal asymptomatic foot, the first Metatarsal Bone is medially deviated (interMetatarsal angle is wider), the width of the forefoot is increased and the proximal phalanx pronates. Between the study groups there was a statistically significant difference of the measured 3D hallux valgus angles at weight bearing but not at rest suggesting the importance of weight bearing CT studies when evaluating hallux valgus. Conclusions To our knowledge, this is the first time weight bearing CT data is presented when evaluating hallux valgus, offering a true alternative to plain radiographs. The relationships of Bones of the forefoot, including rotational changes, can be reliably measured using this imaging method.