Page | 54 Jurusan Ortotik Prostetik, Poltekkes Kemenkes Jakarta I Jl. Wijaya Kusuma No. 48 Cilandak Jakarta Selatan, Indonesia email: jpost@poltekkesjakarta1.ac.id JPOST Journal of Prosthetics Orthotics Science Technology Volume 1, Number 2 Year 2022 ISSN (online): 2962-8016 DOI: 10.36082/jpost.v1i2.869 2D-MOTION ANALYSIS: KNEE JOINT ANGULATION OF TRANSTIBIAL AMPUTEE PATIENT WHO USE SACH FOOT AT CLINIC LABORATORY OF PROSTHETICS AND ORTHOTICS DEPARTMENT IN POLYTECHNIC OF HEALTH MINISTRY OF HEALTH JAKARTA 1 Kinanti Restiana Putri 1 , Olle Hjelmström 2 , Tri Riana Lestari 3 , Atikah Adyas 4 1 Orthopaedia Indonesia 2 Exceed Worldwide, Sweden 3 Prosthetics and Orthotics Department, Polytechnic of Health Sciences Jakarta I, Indonesia 4 Public Health Department, Mitra Indonesia University, Lampung Article History Received date: 12-11-2022 Revised date: 15-11-2022 Accepted date: 17-11-2022 Abstract Keywords: Transtibial, SACH Foot, knee joint angulation The neutral foot position of the prosthetic SACH foot has a higher hindfoot area compared to the forefoot area with 1cm heel height. When the patient wears the shoes, foot and shank alignment is at 90 degrees. Thus, when the patient does not use the shoe, the prosthesis will tilt backward especially when the foot is mid-stance and will force the pressure of the knee toward the extension of the knee joint which can cause damage to the knee joint structure. Therefore, knee joints will be measured at the time of the patient's use and not wearing shoes during mid-stance. Objective: To find out if there are significant differences in knee joint degree during mid-stance when using and not using shoes with 1cm heel height. Methods Quantitative comparative by observation of 2-dimensional motion in transtibial amputation patients using shoes and not using shoes with cross-sectional study design. Result : The degree of knee joints generated during mid-stance by patients with transtibial amputation when using shoes was 10.8 o of flexion (p = 0.004) while at the time of not using the resulting knee boots was 4.5 o of flexion (p = 0,000), normal degree of knee joint during mid- stance is 10 o -20 o of flexion. The results of paired t-test showed that there were significant differences in knee joint degree from standard degree, but when using the shoe showed a result of 0.8 o larger than the lowest normal range while when not using shoes the resulting degree of 6.3 o is smaller than lowest normal range. This is an open access article under the CC-BY-SA license. Copyright © 2022 by Author. Published by Politeknik Kesehatan Kemenkes Jakarta I Author Correspondence: Kinanti Restiana Putri Orthopaedia Indonesia Email: kinantirp@gmail.com