Department of Orthopedics and Traumatology, University Medical Center, Mainz, Rhineland-Palatinate, Germany.
Department of Radiology, University Medical Center, Mainz, Rhineland-Palatinate, Germany.
PLoS One. 2020 May 21;15(5):e0232988. doi: 10.1371/journal.pone.0232988. eCollection 2020.
Anatomically preshaped implants are needed for exact restoration of the anatomy after fractures of the proximal ulna and ulnar shaft, which enables a good functional outcome. Aim of this computed tomographic analysis was to identify specific characteristics of the ulna. The data serve for the development of a new intramedullary implant for stabilisation of proximal and diaphyseal ulna fractures.
With a standardized research method 100 CT scans of the ulna were evaluated regarding anatomic parameters like width of the medullary canal, proximal ulna dorsal angulation and varus angulation. Also, correlations of these parameters were analyzed statistically.
The mean proximal ulna dorsal angulation (PUDA) was 6.4° (SD 2.8°), while the mean varus angulation of the proximal ulna was 12.4° (SD 3.3°). The length of the ulna bone was 253.6 mm (SD 19.9 mm) on average. The average minimum diameter of the medullary canal was 4.2 mm (SD 1.1 mm) located at 141.3 mm (SD 19.7 mm) from the olecranon tip. There is a positive correlation between age and minimum diameter in our patient cohort (p< 0.001).
Our study described the anatomy of the proximal ulna and the ulna shaft with a reproducible research method in a representative patient cohort. The knowledge of the evaluated anatomic parameters can lead to an improvement of any implant design for the fixation of proximal and diaphyseal ulna fractures.
在尺骨近端和骨干骨折后，需要解剖预成型植入物来精确恢复解剖结构，从而实现良好的功能结果。本计算机断层扫描分析的目的是确定尺骨的特定特征。这些数据可用于开发一种新的髓内植入物，以稳定尺骨近端和骨干骨折。
采用标准化的研究方法，对 100 例尺骨 CT 扫描进行评估，评估解剖参数，如髓腔宽度、尺骨近端背侧成角和内翻成角。还对这些参数进行了统计学相关性分析。
平均尺骨近端背侧成角（PUDA）为 6.4°（SD 2.8°），而尺骨近端内翻成角为 12.4°（SD 3.3°）。尺骨长度平均为 253.6mm（SD 19.9mm）。髓腔最小直径的平均值为 4.2mm（SD 1.1mm），位于尺骨鹰嘴尖端 141.3mm（SD 19.7mm）处。在我们的患者队列中，年龄与最小直径之间存在正相关（p<0.001）。
我们的研究采用可重复的研究方法，在具有代表性的患者队列中描述了尺骨近端和骨干的解剖结构。评估的解剖参数的知识可以提高任何用于固定尺骨近端和骨干骨折的植入物设计的水平。
