Chamani Vahid, Bahramizadeh Mahmood, Khosravi Mobina, Biglarian Akbar, Amjad Gholamreza Ghorbani, Mousavi Seyyed Mohammad Ebrahim, Arazpour Mokhtar
Department of Orthotics and Prosthetics University of Social Welfare and Rehabilitation Sciences Tehran Iran.
Physiotherapy Research Center, Department of Orthotics and Prosthetics, School of Rehabilitation Shahid Beheshti University of Medical Sciences Tehran Iran.
Health Sci Rep. 2024 Dec 17;7(12):e70244. doi: 10.1002/hsr2.70244. eCollection 2024 Dec.
The patellar tendon-bearing (PTB) brace is a crucial device designed to lessen axial forces on the tibia. The newly designed PTB brace allows clinicians to measure offloading amount in the realtime. This study aimed to explore the relationship between a rise in displacement between the foot plate and calf shells of this new PTB brace and changes in the amount of offloading on the tibia.
This pilot study used a sample of five individuals with midshaft tibia fractures to investigate the effectiveness of the PTB brace under different conditions. The PTB brace was tested in six different conditions, with the displacement between the foot plate and calf shells varying in increments of 0.5 cm, from 1 cm to 3.5 cm.
The new PTB brace provided varying levels of offloading, ranging from 22% to 38%. As the vertical distance between the calf shells and foot plate increased, the offloading levels also increased significantly. The study observed significant differences in weight reduction ( = 0.02) and offloading percentages ( = 0.048) when comparing 1 cm and 1.5 cm displacement.
The findings suggest that maintaining a distance of 1.5 cm or more between the calf shells and foot plate is effective in reducing weight and offloading on the tibia. These results have important implications for clinicians using PTB braces to treat tibia fractures, highlighting the importance of adjusting the displacement of the PTB brace to optimize patient outcomes.
髌腱承重（PTB）支具是一种旨在减轻胫骨轴向力的关键器械。新设计的PTB支具使临床医生能够实时测量卸载量。本研究旨在探讨这种新型PTB支具的脚板与小腿托之间位移增加与胫骨卸载量变化之间的关系。
这项初步研究以5例胫骨干骨折患者为样本，调查PTB支具在不同条件下的有效性。PTB支具在六种不同条件下进行测试，脚板与小腿托之间的位移以0.5厘米的增量变化，范围从1厘米到3.5厘米。
新型PTB支具提供了不同程度的卸载，范围从22%到38%。随着小腿托与脚板之间垂直距离的增加，卸载水平也显著增加。在比较1厘米和1.5厘米位移时，研究观察到减重（=0.02）和卸载百分比（=0.048）存在显著差异。
研究结果表明，在小腿托与脚板之间保持1.5厘米或更大的距离可有效减轻体重并减轻胫骨的负荷。这些结果对使用PTB支具治疗胫骨骨折的临床医生具有重要意义，突出了调整PTB支具位移以优化患者治疗效果的重要性。
