Isoforce: A new outrigger system for static progressive orthotic interventions of the proximal interphalangeal joint with constant force transmission—Results of a biomechanical study

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• 作者：Marion Marrel ; MSc ETH^a ; Ulla Jö ; rn Good ; OT Zert. HT SGHR^b ; Miriam Marks ; PhD^a ; Daniel B. Herren ; MD ; MHA^c ; Jö ; rg Goldhahn ; MD ; MAS^d ; ^{jgoldhahn@ethz.ch}
• 关键词：Static progressive orthosis ; Outrigger ; Proximal interphalangeal (PIP) joint ; Contracture ; Biomechanical testing ; Feasibility
• 刊名：Journal of Hand Therapy
• 出版年：2016
• 出版时间：October-December 2016
• 年：2016
• 卷：29
• 期：4
• 页码：451-458
• 全文大小：1703 K
• 卷排序：29

文摘

Bench research—biomechanical study.IntroductionStatic progressive orthotic devices are efficient in treating contractures. However, current outriggers are unable to keep force transmission and the force application angle (FAA) constant.Purpose of the StudyTo evaluate the biomechanical performance of the Isoforce outrigger, a novel extension orthosis.MethodsA hand model was used to measure the required force at the outrigger and FAA, while simulating resolution of different contracture angles. We also tested feasibility in a small patient series.ResultsThe force required with the Isoforce device never exceeded 2.4 N, and the FAA did not change more than 6°. Corresponding figures for the reference devices exceeded 16 N and 20°. The 7 patients testing the Isoforce extension device showed an extension deficit that decreased from 40° at baseline to 25° at 6 weeks. They rated the device as very comfortable to wear.ConclusionsIsoforce maintains constant force transmission and FAA throughout the full range of motion, promotes the lengthening of contracted structures, and is comfortable to wear.Level of EvidenceNot applicable.