Atsushi Kanaya
Hiroshima University
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Featured researches published by Atsushi Kanaya.
Arthroscopy | 2010
Atsuo Nakamae; Mitsuo Ochi; Masataka Deie; Nobuo Adachi; Atsushi Kanaya; Makoto Nishimori; Tomoyuki Nakasa
PURPOSE This study aimed to evaluate the biomechanical function of anterior cruciate ligament (ACL) remnants in anteroposterior and rotational knee stability in patients with a complete ACL injury. METHODS ACL remnants were classified into 5 morphologic patterns: group 1, bridging between the posterior cruciate ligament and tibia; group 2, bridging between the intercondylar notch and tibia; group 3, partial rupture of the posterolateral bundle; group 4, partial rupture of the anteromedial bundle; and group 5, no substantial ACL remnants. The decision of whether the remaining bundle represented partial or complete rupture of the ACL was made based on physical, magnetic resonance imaging, and arthroscopic findings in a comprehensive manner. Patients in groups 1 (n = 18) and 2 (n = 12) underwent intraoperative arthrometry with a navigation system before and immediately after resection of the ACL remnant. The effects of chronicity (duration between injury and surgery) and ACL remnant pattern on changes in knee laxity after debridement of the ACL remnant were investigated. RESULTS Chronicity had a significant effect on changes in anteroposterior knee laxity evaluated at 30° of knee flexion after resection of the ACL remnant (change in laxity of 2.22 mm for chronicity ≤1 year and 0.17 mm for chronicity >1 year). Chronicity did not influence changes in rotational knee stability after resection of the remnant. There were no significant differences between groups 1 and 2 with regard to any of the evaluated changes in knee stability. CONCLUSIONS In groups 1 and 2 ACL remnants contributed to anteroposterior knee stability evaluated at 30° of knee flexion for up to 1 year after injury, beyond which this biomechanical function was lost. Chronicity and remnant pattern did not influence changes in rotational knee stability after resection of the remnant. LEVEL OF EVIDENCE Level III, diagnostic study of nonconsecutive patients.
Journal of Bone and Joint Surgery-british Volume | 2006
Makoto Nishimori; Masataka Deie; Atsushi Kanaya; H. Exham; Nobuo Adachi; Mitsuo Ochi
Bone marrow mesenchymal stromal cells were aspirated from immature male green fluorescent protein transgenic rats and cultured in a monolayer. Four weeks after the creation of the osteochondral defect, the rats were divided into three groups of 18: the control group, treated with an intra-articular injection of phosphate-buffered saline only; the drilling group, treated with an intra-articular injection of phosphate-buffered saline with a bone marrow-stimulating procedure; and the bone marrow mesenchymal stromal cells group, treated with an intra-articular injection of bone marrow mesenchymal stromal cells plus a bone marrow-stimulating procedure. The rats were then killed at 4, 8 and 12 weeks after treatment and examined. The histological scores were significantly better in the bone marrow mesenchymal stromal cells group than in the control and drilling groups at all time points (p < 0.05). The fluorescence of the green fluorescent protein-positive cells could be observed in specimens four weeks after treatment.
Journal of Biomedical Materials Research Part A | 2010
Mitsuru Motoyama; Masataka Deie; Atsushi Kanaya; Makoto Nishimori; Ayato Miyamoto; Shinobu Yanada; Nobuo Adachi; Mitsuo Ochi
We evaluated the efficacy of transforming growth factor (TGF)-beta-immobilized magnetic beads for chondrogenesis in vitro using a mesenchymal stem cell (MSC) delivery system and an external magnetic force (EMF). MSCs isolated from the bone marrow of Sprague Dawley rats were mixed with carboxyl group-combined magnetic beads (Ferri Sphere 100C) coated with anti-rat CD44 mouse monoclonal antibodies. TGF-beta3 (10 and 1 ng/mL) was attached magnetically to such other Ferri Sphere 100C beads via an amide bond formed between a primary amino group on the TGF-beta3 and the carboxyl groups on the surface of the beads. MSC-magnetic bead complexes were centrifuged to form a pellet and cultured in chondrogenic differentiation medium (CDM) supplemented with either 10 or 1 ng/mL TGF-beta-immobilized magnetic beads (10 or 1 ng/mL TGF-beta-immobilized magnetic bead groups) or in CDM supplemented with 1 or 10 ng/mL TGF-beta (1 or 10 ng/mL TGF-beta group). TGF-beta-immobilized magnetic beads were gathered effectively under an EMF. Chondrogenesis was achieved from the MSC-magnetic bead complexes in the presence of 1 ng/mL TGF-beta-immobilized magnetic beads.
Sports Medicine, Arthroscopy, Rehabilitation, Therapy & Technology | 2010
Makoto Nishimori; Masataka Deie; Nobuo Adachi; Atsushi Kanaya; Atsuo Nakamae; Mitsuo Ochi
We report a case of intra-articular angiolipoma of the knee. This case report describes our experience in excising an intra-articular angiolipoma of the knee joint. Complete resection under arthroscopy was performed in a 30-year-old man. Two years after the surgery, no evidence of recurrence was seen. Intra-articular angiolipomas should be considered in the differential diagnosis of intra-articular masses in adolescents with recurrent hemarthrosis without trauma.
Arthroscopy | 2006
Mitsuo Ochi; Nobuo Adachi; Masataka Deie; Atsushi Kanaya
Knee Surgery, Sports Traumatology, Arthroscopy | 2009
Atsushi Kanaya; Mitsuo Ochi; Masataka Deie; Nobuo Adachi; Makoto Nishimori; Atsuo Nakamae
Arthroscopy | 2007
Atsushi Kanaya; Masataka Deie; Nobuo Adachi; Makoto Nishimori; Shinobu Yanada; Mitsuo Ochi
Arthroscopy | 2007
Masataka Deie; Mitsuo Ochi; Nobuo Adachi; Ryoji Kajiwara; Atsushi Kanaya
Knee Surgery, Sports Traumatology, Arthroscopy | 2008
Makoto Nishimori; Masataka Deie; Nobuo Adachi; Atsushi Kanaya; Atsuo Nakamae; Mitsuru Motoyama; Mitsuo Ochi
Knee | 2007
Yohei Ito; Masataka Deie; Nobuo Adachi; Kenji Kobayashi; Atsushi Kanaya; Ayato Miyamoto; Tomoyuki Nakasa; Mitsuo Ochi