Semitubular blade plate for fixation in the proximal humerus

Area of Science:

• Orthopedic surgery
• Biomechanical engineering
• Trauma surgery

Background:

• Achieving rigid internal fixation in proximal humerus fractures is challenging due to osteoporotic bone and small fragments.
• Traditional plates and screws may not provide adequate purchase in these complex cases.

Purpose of the Study:

• To evaluate the clinical outcomes and biomechanical strength of a modified semitubular plate (blade plate) for proximal humerus fixation.
• To compare the fixation strength of the semitubular blade plate against a standard AO "T" plate.

Main Methods:

• A semitubular plate was fashioned into a blade plate device for fixation in seven patients (four fractures, three osteotomies).
• Clinical union and range of motion were assessed postoperatively.
• A biomechanical study compared the semitubular blade plate to an AO "T" plate using matched pairs of human humeri in an oblique subcapital osteotomy model.

Main Results:

• All seven patients achieved clinical and radiographic union within 4 months, with a functional range of motion.
• Biomechanical testing revealed no statistically significant difference in load to failure, yield load, energy absorbed, or stiffness between the semitubular blade plate and the AO "T" plate.

Conclusions:

• The semitubular blade plate provides a viable and effective fixation method for challenging proximal humerus fractures and osteotomies.
• This modified fixation technique expands the armamentarium for surgeons dealing with difficult proximal humerus reconstructions.