Prokop A, Chmielnicki M
Unfallchirurgie, Kliniken Sindelfingen, Klinikverbund Südwest.
Z Orthop Unfall. 2013 Dec;151(6):565-8. doi: 10.1055/s-0033-1351079. Epub 2013 Dec 17.
The Mason classification is used for radial head fractures. Mason type I fractures are managed by a functional conservative treatment of no loading for six weeks. Mason II fractures with a displacement greater than 10° or a depression of greater than 2 millimeters are treated with open reduction and use of biodegradable implants constructed of polylactide. These implants have the advantage of maintaining the joint surface by placement beneath the surface of the articular cartilage. Furthermore, the implants can be placed from various positions through the articular surface and are therefore more versatile than other modes of open reduction.
The OP technique in Mason II radial head fracture is demonstrated in a video for the example of a 31-year-old male patient.
35 patients were treated using the new polylactide pins (Polypin®). Average follow-up for 34 patients was 38 months. 31 patients with Mason type II fractures presented with a score of 96 out of 100 using the Broberg Morrey score. CT scans were performed after 18 and 24 months in all patients. One first degree asymptomatic osteolysis was observed at 18 months which was reduced at 24 months. Two years later the pins were not visible on conventional X-rays. CT scans at 5 years revealed the implants to be in various levels of resorption and bony regrowth.
Dislocated radial head fractures can be treated with good results with biodegradable implants.
梅森分类法用于桡骨头骨折。梅森I型骨折采用六周不负重的功能保守治疗。移位大于10°或凹陷大于2毫米的梅森II型骨折采用切开复位并用聚丙交酯制成的可生物降解植入物治疗。这些植入物的优点是通过置于关节软骨表面下方来维持关节面。此外，植入物可通过关节面从不同位置置入，因此比其他切开复位方式更具通用性。
以一名31岁男性患者为例，通过视频展示梅森II型桡骨头骨折的OP技术。
35例患者使用新型聚丙交酯针（Polypin®）进行治疗。34例患者的平均随访时间为38个月。31例梅森II型骨折患者使用布罗伯格·莫里评分法，评分达100分中的96分。所有患者在18个月和24个月后进行CT扫描。18个月时观察到1例一级无症状骨溶解，24个月时减轻。两年后，在传统X射线下看不到针。5年时的CT扫描显示植入物处于不同程度的吸收和骨再生状态。
可生物降解植入物治疗桡骨头脱位骨折效果良好。
