Department of Diagnostic Radiology, School of Medicine, Lebanese American University Medical Center-Rizk Hospital, Lebanese American University, Beirut, Lebanon.
Department of Orthopedic Surgery, School of Medicine, Lebanese American University Medical Center-Rizk Hospital, Lebanese American University, Beirut, Lebanon.
Surg Radiol Anat. 2021 May;43(5):749-753. doi: 10.1007/s00276-020-02608-2. Epub 2020 Nov 2.
The palmaris longus (PL) tendon present a high degree of variations; the commonest is its absence which could reach more than 40% in some populations. The PL tendon is highly relevant in hand reconstructive surgery; however, MRI variations of PL tendon have been exceptionally reported. To this, this study investigated PL tendon variations using MRI in a Lebanese population.
This is a retrospective study of distal forearm MRI examinations to evaluate the presence, anatomical variations and morphometric of PL tendon. The outcomes were set as overall frequency, gender-based and side-base frequencies, correlations between prevalence and gender/side, morphological variants, thickness, and width of PL tendon.
The sample comprised 335 patients including a total of 339 MRI scans. The PL was present in 221 wrists (65.2%), and bilaterally in only one (25%) out of the 4 bilateral cases. All PL were located using the Axial T1 views. Univariate and multivariate analyses showed no correlation with side, gender, or Tesla power. The only morphological variation was a reversed PL in 2 cases (0.6%). The mean width was 4.24 ± 1.2 mm. The mean thickness was 2.75 ± 0.6 mm.
As far as we know, this is the first study to report the total array of variations of PL tendon using MRI, and its prevalence in a Lebanese population. The mean width of PL tendon calculated with high quality MR imaging was found to be similar to that reported by cadaveric studies.
掌长肌（PL）肌腱存在高度变异；最常见的是其缺失，在某些人群中可达到 40%以上。PL 肌腱在手重建外科中非常重要；然而，MRI 对 PL 肌腱的变异报道却非常罕见。因此，本研究在黎巴嫩人群中使用 MRI 研究 PL 肌腱的变异。
这是一项回顾性研究，对远端前臂 MRI 检查评估 PL 肌腱的存在、解剖变异和形态。结果设定为总体频率、基于性别和基于侧别的频率、患病率与性别/侧别之间的相关性、PL 肌腱的形态变异、厚度和宽度。
该样本包括 335 名患者，共 339 份 MRI 扫描。221 个腕部（65.2%）存在 PL，而在 4 例双侧病例中，仅在 1 例（25%）双侧存在。所有的 PL 均通过轴向 T1 视图定位。单变量和多变量分析显示与侧别、性别或特斯拉功率无关。唯一的形态学变异是 2 例（0.6%）的反向 PL。平均宽度为 4.24±1.2mm。平均厚度为 2.75±0.6mm。
据我们所知，这是首次使用 MRI 报告 PL 肌腱全部变异类型及其在黎巴嫩人群中的患病率的研究。使用高质量 MR 成像计算的 PL 肌腱平均宽度与尸体研究报道的相似。
