Background There exists a need for an adjustable socket to accommodate residual limb volume and shape changes. Further, limb loss rates globally are rising and there is a large unmet need for affordable and accessible prosthetic systems. Objective To assess the utility of an immediate fit modular prosthetic system (iFIT Prosthetics, LLC). Design Prospective feasibility study involving a 2‐week single‐group pre‐post intervention study. Setting Physical Medicine and Rehabilitation gait laboratory. Participants Participants were at least 6 months post amputation and walking with a conventional prosthesis. They were free of skin wounds, other neurological disorders, and severe pain conditions. Methods Participants were fit with an immediate fit prosthesis and instructed to wear it for a 2‐week evaluation period. They were given a progressive wearing schedule and they completed outcome measurements at the 2‐week follow‐up. Main Outcome Measurements Self‐reported satisfaction, gait biomechanics, and intrasocket peak pressures. Results Twenty‐six participants entered the study, with 22 completing the single group pre‐post study. They averaged 50 years (SD ±10.2) of age; four were female. Sixteen were dysvascular and 10 were traumatic in etiology. Significant differences (P = .03) in self‐reported satisfaction were found in favor of the iFIT device 29.33 (SD ± 4.51) versus the conventional device 25.52 (SD ± 6.8). No falls or limb ischemia were reported. Gait biomechanics revealed no differences across any temporal characteristics. Intrasocket peak pressures were significantly lower for the iFIT prostheses overall (P = .0014), at the anterior tibia (P = .0002), and the lateral side of the residual limb (P = .013). Conclusions The iFIT transtibial prosthetic system appears to be safe in this short‐term single‐group pre‐post study. This study provided preliminary evidence to support the feasibility of the iFIT system. It compared favorably to participants' conventional prostheses across all outcome measures. With its cost, adjustability, and accessibility advantages, this device may prove useful for persons with transtibial amputations. A larger multicenter study is needed to confirm these results. Level of Evidence III

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INTRODUCTION Limb loss rates globally are rising and there is a large unmet need for an affordable and accessible prosthetic system for this growing US and International population.  The purpose of this prospective cohort study was to assess the feasibility and utility of a novel immediate fit modular prosthetic system (IFIT Prosthetics, LLC™ prosthesis) for transtibial amputees. Abstract PDF  Link: https://jps.library.utoronto.ca/index.php/cpoj/article/view/32025/24442 How to cite: Dillingham T.R, Kenia J, Shofer F.S, Marschalek J. AN IMMEDIATE FIT AND ADJUSTABLE TRANSTIBIAL PROSTHETIC SYSTEM; A PROSPECTIVE FEASIBILITY AND EFFICACY STUDY. CANADIAN PROSTHETICS & ORTHOTICS JOURNAL, VOLUME 1, ISSUE 2, 2018; ABSTRACT, POSTER PRESENTATION AT THE AOPA’S 101ST NATIONAL ASSEMBLY, SEPT. 26-29, VANCOUVER, CANADA, 2018. DOI: https://doi.org/10.33137/cpoj.v1i2.32025 Abstracts were Peer-reviewed by the American Orthotic Prosthetic Association (AOPA) 101st National Assembly Scientific Committee.  http://www.aopanet.org/

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