A new concept of orthosis for correcting fingers ulnar deviation

Abstract

Introduction: Rheumatoid arthritis (RA) is a chronic, multisystem disease that involves synovial inflammation, leading to deformities, like finger ulnar deviation, pain and functional difficulties. The conservative treatment comprises orthoses, features added to the body that aims to correct deformity, reduce pain and improve functionality. In the market there are few kinetic/mobile orthosis models for correction of ulnar deviation in the fingers. However, users usually complain about increased palmar volume, presence of pressure points and functional loss, demonstrating the necessity to develop more effective orthoses. In this paper we introduce an innovative concept, of an original and articulate dynamic/kinetics orthosis, which aims to correct this finger deformity and encourage functionality. Methods: Methodological procedures were divided into: Need Recognition; Specification Concept; Prototype and Validation. This paper deals with the last two stages of this research. Results: A virtual orthosis prototype using CAD Solid Edge Insight™ was proposed. The orthosis developed consisted of 10 pieces, made of metal and resin with carbon fiber. Conclusion: After virtual movement simulation, it was verified that the prototype allows for wrist and finger flexion/extension, the possibility of bilateral use, and provids ulnar deviation correction for the fingers. The final product is innovative and is easy to put on/off; volunteers claimed that the new prototype was satisfactory in terms of deformity correction.

The Effect of Ulnar Deviation Orthosis in Patients with Zigzag Deformity Due to Rheumatoid Hand

“…It appears that the static device does not permit for motions, whereas the dynamic orthoses are endowed with elements that allow or facilitate movements through applied external force to restore or replace lost movements 21 . The device used in the present study was a dynamic orthosis for daily use which allowed mobility in the wrist and fingers.…”

“…Nighttime splints keep the hand in a resting position and promote joint protection in patients with RA when individuals have a passive lack of MP extension. Dynamic splints include elements that facilitate movement by the applied external force to hinder tissue deformation 21 . Philips 22 proposed that a functional splint may be prescribed in the subacute phase 2 to decrease ulnar drift.…”

“…Dynamic splints include elements that facilitate movement by the applied external force to hinder tissue deformation. 21 Philips 22 proposed that a functional splint may be prescribed in the subacute phase 2 to decrease ulnar drift. However, splinting MP joints has practical limitations.…”