1992 Fiscal Year Final Research Report Summary

Biomechanical Study of Load Transmission in the Wrist Joint

Research Project

Project/Area Number	02670664
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Orthopaedic surgery
Research Institution	Saitama Medical School
Principal Investigator	SAKADA Takenori Faculty of Medicine, Assistant Prof, 医学部, 助教授 (80178558)
Co-Investigator(Kenkyū-buntansha)	OHMORI Masahiro Faculty of Medicine, Assistant, 医学部, 助手 (90213876)
Project Period (FY)	1990 – 1992
Keywords	Wrist joint / Load transmission / Distal radial fracture / Carpal instability / TFC / Scapholunate dissociation
Research Abstract	1. A biomechanical study of load transmission after distal radial fractrures An experimental model of distal radial fracture was disigned to measure the load transmission through the wrist joint. The axial force in the radioscaphoid articulation became bigger than the radiolunate articulation when dorsal tilt increased by more than 20 degrees and plus variant more than 2mm. Corrective osteotomy should be considered biomechanicaly in thoes conditions. 2. Load transmission in the wrist joint--Effect of TFC excion--- Load transmission of the radiocarpal joint were measured for the determination of the influence of patial and complete excision of the TFC. In partial excision of the TFC, axial force of the TFC was reduced. Thus partial resection was thought to be effective treament metod. In complete excision. Axial force on TFC increased. Those resuls suggest that the TFCC is an important shock absorber buffering pressure from wrist joint. 3. Load transmission of the wrist joint on scapholunate dissociation The axial force and contact area of the radiolunate articulation in radiocarpal joint and the lunocapitate articulation in mid carpal joint were markedly increased on volar rotation of the scaphoid bone. These results suggest that volar rotation of scaphoid can induce scapholunate advanced collapsed wrist.