The Experts below are selected from a list of 1332 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.
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.
Hajime Owaki - 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.