To explore the epidemiological characteristics, clinical characteristics, treatment strategies, and clinical results of non-dislocated hyperextension tibial plateau fracture. A total of 25 cases of non-dislocated hyperextension tibial plateau fracture patients were collected (12 males and 13 females), aged 27–79 years. Preoperative tibial plateau posterior slope angle was − 10~0° (average − 5.2°). Preoperative MRI showed 5 cases of MCL injury, 3 cases of PLC complex injury, and 2 cases of PLC + PCL injury. The change of tibial plateau posterior slope angle was more than 10° in patients with ligament injury, and the patients with a tibial plateau posterior slope angle change less than 10° had no ligament injury; 6 patients with simple column fracture had a ligament injury, 2 patients with bilateral column fracture had a ligament injury, and 2 patients with three column fracture had a ligament injury. Patients were followed up for 12–24 months (average 16.4 months). The operative time was 65–180 min (average 124 min), and the blood loss was 20–200 ml (average 106 ml). The plate was placed on the anterior part of tibial plateau. Evaluation of postoperative fracture reduction was as follows: 20 cases reached anatomic reduction, 5 cases reached good reduction (between 2 and 5 mm articular surface collapse), and the excellent rate of fracture reduction was 100%. The fracture healing time was 3–6 months (average 3.3 months). The postoperative knee Rasmussen score was 18–29 (average 24.9), and the postoperative knee joint mobility was 90–130° (average 118°). Two patients suffered superficial infection. The main imaging characteristic of “non-dislocated hyperextension tibial plateau fracture” is the change of tibial plateau posterior slope angle. The injury of single anteromedial column/anterolateral column fracture is easy to combine with “diagonal” injury, and when the tPSA changes more than 10°, it is easy to be combined with ligament injury. By reducing the joint articular surface and lower limb force line, repairing the soft tissue structure, and reconstructing the knee joint stability, we can get satisfactory results. It was a retrospective study. This study was consistent with the ethical standards of the Second Affiliated Hospital of Zhejiang University Medical College and was approved by the hospital ethics committee and the trial registration number of our hospital was 20180145 .

中文翻译：

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“非脱位性高位胫骨平台骨折”的临床特点及治疗。

探讨非脱位性高位胫骨平台骨折的流行病学特征，临床特点，治疗策略和临床结果。总共收集了25例非移位性高位胫骨平台骨折患者（男12例，女13例），年龄27-79岁。术前胫骨平台后倾斜角为-10〜0°（平均-5.2°）。术前MRI显示5例MCL损伤，3例PLC复杂损伤和2例PLC + PCL损伤。韧带损伤患者胫骨平台后倾斜角变化大于10°，胫骨平台后倾斜角变化小于10°的患者无韧带损伤。单纯柱状骨折6例韧带损伤，双侧柱状骨折2例韧带损伤，2例三柱骨折患者韧带损伤。对患者进行了12-24个月的随访（平均16.4个月）。手术时间为65–180分钟（平均124分钟），失血量为20–200 ml（平均106 ml）。将板放置在胫骨平台的前部。术后骨折复位的评估如下：解剖复位20例，良好复位5例（2至5 mm关节表面塌陷），优良的骨折复位率为100％。骨折愈合时间为3-6个月（平均3.3个月）。术后膝关节Rasmussen评分为18–29（平均24.9），术后膝关节活动度为90–130°（平均118°）。两名患者浅表感染。“非移位性高位胫骨平台骨折”的主要影像学特征是胫骨平台后倾斜角的变化。单根前内侧柱/前外侧柱骨折的损伤易于与“对角线”损伤合并，并且当tPSA变化超过10°时，很容易与韧带损伤合并。通过减少关节的关节面和下肢的力线，修复软组织结构，并重建膝关节的稳定性，我们可以获得满意的效果。这是一项回顾性研究。本研究符合浙江大学医学院第二附属医院伦理规范，并经医院伦理委员会批准，我院试行注册号为20180145。