A rarely described fracture behind difficult elbow injuries
In May 2026, a research team led by Professor Jiang Xieyuan and Professor Cha Yejun in the trauma orthopaedics department of Beijing Jishuitan Hospital published a clinical study in the Journal of Shoulder and Elbow Surgery (JSES) on a special type of elbow injury: posterior shear fractures of the distal humerus.
Shear fractures of the distal humerus — where the joint surface of the lower end of the upper arm bone is broken off in a slice — are among the most complex elbow fractures. Patients face a relatively high risk of complications such as elbow stiffness after surgery, which can seriously affect daily life. Because the posterior variant is rare and data are scarce, clinicians have long faced unclear classification and no settled treatment strategy.
What the study covered
The team conducted a retrospective case series. From nearly 1,300 distal humeral fractures treated over four years, they identified more than 200 anterior shear fractures but only 13 posterior shear fractures with complete follow-up — a measure of how uncommon the pattern is.
The study describes the injury pattern: the fracture involves the back of the capitellum and trochlea (the two joint surfaces of the lower humerus), most often the posterior capitellum, and the elbow is typically dislocated posteriorly-laterally or posteriorly-medially at the time of injury. The mechanisms are either a valgus posterolateral rotational injury or a varus posteromedial rotational injury. Surgery used a medial approach, a lateral approach, or a combined approach depending on the fragments.
Thirteen followed patients is a small series. The study's value is descriptive: it defines the fracture pattern, documents what was done, and reports outcomes, giving surgeons a reference when planning individual treatment. It does not, and cannot, show that one surgical approach is better than another.
The team behind it
Beijing Jishuitan Hospital hosts China's first dedicated elbow surgery group, built over more than two decades. The team has performed over 2,000 elbow release operations for stiffness, helped standardise treatment protocols for complex elbow injuries, pioneered robot-assisted precise localisation of the elbow's axis of rotation, and established a Chinese database of intercondylar humeral fractures and radial head fractures.
Relevance to complex elbow injuries
Complex elbow fractures and dislocations are a reason international patients seek second opinions, and Jishuitan's elbow unit is one of the busiest in China. This summary belongs to Wellward China's Bones, Joints, Spine & Muscles health area. It describes a research publication, not a treatment recommendation for any individual patient.