25premus138 10.3205/25premus138 urn:nbn:de:0183-25premus1381 Meeting Abstract Poshtmahi Poshtmahi Mazaher M

University of Kurdistan, Sanandaj, Iran

author Mohammadi Mohammadi Hemn H

University of Kurdistan, Sanandaj, Iran

author Sarvestan Sarvestan Javad J

School of Human Kinetics of the Lisbon University, Cruz Quebrada, Portugal University of Ostrava - Faculty of Education (Building V & VM), Ostrava, Czech Republic

author German Medical Science GMS Publishing House

Düsseldorf

610 20250909 engl This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). M0625 138 12th International Scientific Conference on the Prevention of Work-Related Musculoskeletal Disorders PREMUS 2025 Poster PO 3 Tübingen 20250909 20250912 138 TextIntroduction: Low back pain (LBP) is the most common musculoskeletal disorder in adults, affecting about 39% of the adult population and nearly 570 million people globally each year. It is classified as acute (<6 weeks), subacute (6–12 weeks), or chronic (12–52 weeks). Chronic non-specific LBP (CNSLBP) can significantly affect gait, a fundamental daily activity. Lumbar hyperlordosis is a key risk factor for LBP. Additionally, footwear can influence neuromuscular control and gait mechanics. Despite numerous studies examining the effects of each factor individually, limited research exists on their combined influence. This study aimed to investigate gait kinematics in the presence of CNSLBP, hyperlordosis, and footwear.Methods: Fifty-eight adult males (mean age: 26.03 ± 4.32 years) were divided into four groups: healthy controls (n=15), CNSLBP (n=14), hyperlordosis (n=14), and both CNSLBP with hyperlordosis (n=15). Hyperlordosis was defined as a lumbar curve >50°, and CNSLBP was diagnosed based on persistent pain without a specific cause. Pain and disability were assessed using a Visual Analog Scale and the Oswestry Disability Index .Lower limb kinematics were analyzed in the sagittal plane using a 2D camera system and Kinovea software, applying the Plug-in Gait marker protocol. Each participant walked along a 12-meter path five times under barefoot and shod conditions. Data were analyzed using MATLAB and time-series statistical parametric mapping, including paired t-tests and one-way ANOVA .Results: Participants with hyperlordosis showed increased ankle dorsiflexion when wearing shoes during early stance (0–5%), mid-stance (67–85%), and late swing (92–100%) phases (Figure 1 ). Wearing shoes led to reduced knee flexion during parts of the swing phase across all groups. Hip flexion also decreased at various gait stages when shod.Participants with LBP (with/without hyperlordosis) showed greater dorsiflexion compared to those without LBP in early stance under barefoot conditions and during the swing phase when wearing shoes. They also exhibited more hip flexion before heel strike and less knee hyperextension at terminal stance. Footwear amplified these differences, indicating a compensatory reliance on the ankle joint to reduce load on proximal joints. Figure 1 Discussion and conclusion: Wearing shoes increases ankle dorsiflexion in individuals with hyperlordosis and alters knee and hip mechanics in all groups. LBP leads to greater ankle dorsiflexion and hip flexion, possibly to redistribute impact forces away from the spine. Future studies should explore lower limb muscle activation, especially in peroneal and anterior tibial muscles, under both barefoot and shod conditions. Fairbank JC Pynsent PB The Oswestry Disability Index 2000 Spine (Phila Pa 1976) 2940-52; discussion 2952 Fairbank JC, Pynsent PB. The Oswestry Disability Index. Spine (Phila Pa 1976). 2000 Nov 15;25(22):2940-52; discussion 2952. DOI: 10.1097/00007632-200011150-00017 http://dx.doi.org/10.1097/00007632-200011150-00017 Friston KJ Statistical parametric mapping 2003 Neuroscience databases: a practical guide 237-50 Friston KJ. Statistical parametric mapping. In: Kötter R, editor. Neuroscience databases: a practical guide. New York: Springer; 2003. p. 237-50. 0

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