710 Published by DiscoverSys | Bali Med J 2020; 9(3): 710-715 | doi: 10.15562/bmj.v9i3.2023 ORIGINAL ARTICLE ABSTRACT Open access: www.balimedicaljournal.org and ojs.unud.ac.id/index.php/bmj Patient characteristics of non-operative anterior cruciate ligament injury associated with poor knee functions on activities of daily living: a cross-sectional study I Putu Gde Surya Adhitya 1,2* , Ida Bagus Amertha Putra Manuaba 3,4 , Lalu Suprawesta 1,5 , Yosika Septi Mauludina 1 , Siti Ainun Marufa 6 Introduction: The ACL injury has commonly occurred in a greater number of athletes, less publication is about poor knee function and ACL injury in the patient with non-operative treatment. This study aimed to describe the characteristics of patients with ACL injury non-operative, which are associated with poor knee function on daily living activities. Methods: We included patients with ACL injury that has been diagnosed for ACL injury by an orthopedic surgeon or physiotherapist in a hospital or private clinic. All participants were recruited from February 2019 to April 2019. The inclusion criteria were patients who at least 18 years old. We used the KOOS ADL function cut-of score ≤80 to dichotomous the patient with knee problems, and score >80 have no statistical analysis problem. We calculated using binary logistic regression on the KOOS ADL function for each variable. Results: The mean score of KOOS daily living was 72.8 points, of which 66 participants had poor scores, and 37 were acceptable. Women were 9.2 times more likely to had poor KOOS daily living scores than men in non-operative ACL injury patients (p=0.044), and non-elite athletes had a higher possibility by 8.5 times higher than those who were participated in sports only for leisure or recreation (p=0.002). Conclusion: This study confrmed that patients who did not undergo the ACL reconstruction had a poor knee function in daily living. It was associated with women and non-elite athlete participants, yet the concomitant injuries were possibly confounder for the association. Keywords: non-operative ACL injury, knee function, activities of daily living, KOOS Cite this Article: Adhitya, I.P.G.S., Manuaba, Amertha, I.B.P., Suprawesta, L., Mauludina, Y.S., Marufa, S.A. 2020. Patient characteristics of non-operative anterior cruciate ligament injury associated with poor knee functions on activities of daily living: a cross-sectional study. Bali Medical Journal 9(3): 710-715. DOI: 10.15562/bmj.v9i3.2023 1 Graduate Institute of Injury Prevention and Control, College of Public Health, Taipei Medical University 2 Department of Physical Therapy, Faculty of Medicine, Universitas Udayana, Bali Indonesia 3 PhD Candidate, Department of Education and Humanities in Medicine, International Program in Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan 4 Medical and Health Education Development, Faculty of Medicine, Universitas Udayana, Bali- Indonesia 5 Department of Sport and Health Education, Faculty of Sport Science and Public Health, Universitas Pendidikan Mandalika, West Nusa Tenggara-Indonesia 6 Department of Physical Therapy, Faculty of Health Science, Universitas Muhammadiyah Malang, East Java, Indonesia *Corresponding to: I Putu Gde Surya Adhitya; Department of Physical Therapy, College of Medicine, Universitas Udayana, P.B Sudirman Street, Denpasar, 80232, Bali-Indonesia; surya_adhitya@unud.ac.id Bali Medical Journal (Bali Med J) 2020, Volume 9, Number 3: 710-715 P-ISSN.2089-1180, E-ISSN: 2302-2914 Received: 2020-09-19 Accepted: 2020-10-20 Published: 2020-11-03 710 INTRODUCTION Worldwide, the anterior cruciate ligament (ACL) injury is a common injury in the younger adult population. 1 Te incidence of ACL injury is more than 200,000 cases, with 100,000 of these knees reconstructed annually. 2 Te references found that the amateur sporting groups generally had a higher incidence of ACL than the entire population and lower than among professional athletes. 3 Besides, the ACL injury has commonly occurred in a greater number of athletes, in which women have 2 – 9 times greater risk of the ACL injury than men. 4 Since most people with ACL injury are younger adults, the long term consequences of the ACL injury has highly contributed to the poor knee function that causes chronic medical pain, joint functional limitation, decrease quality of life, and disability. 5 While the ACL has a critical role in the knee movement and proprioception, when it is injured, then it will cause poor lower body movement and normal human performance that afect the limitation of activity daily living and quality of life. 6 While studies published about the ACL injury in the patient with knee reconstruction in the multiple dimension. 7,8 Less publication is about poor knee function and ACL injury in the patient with non- operative treatment. Tis study has to describe the characteristics of patients with ACL injury non-operative, which are associated with poor knee function on daily living activities. Tis study will give information and knowledge for clinical practice and enrich the references in the feld of sports injury and rehabilitation research. METHODS Participants and data collection Te population conducted in this cross-sectional