Early Experience in Pathologic Humerus Fracture Treated With the Photodynamic Bone Stabilization System Shows...

Area of Science:

• Orthopedic Surgery
• Oncology
• Biomaterials

Background:

• Traditional metallic orthopedic implants can hinder radiographic evaluation and radiation therapy for pathologic fractures.
• Radiolucent implants are being developed to overcome these limitations.
• The Photodynamic Bone Stabilization System (PBSS) is a novel radiolucent implant option.

Purpose of the Study:

• To evaluate the clinical outcomes and complications of the PBSS in patients with impending or complete pathologic fractures.
• To assess implant survival and identify factors associated with implant failure.

Main Methods:

• Retrospective review of 25 patients (29 fractures) treated with PBSS at two hospitals.
• Fractures were located in the proximal radius or humerus due to metastatic carcinoma, myeloma, lymphoma, or melanoma.
• Implant status, complications, and patient survival were assessed at final follow-up using chi-square and t-tests for analysis.

Main Results:

• Implant failure occurred in 8 of 29 (27.5%) cases.
• Twenty percent of patients (5/25) required revision surgery due to complications.
• Implant breakage was significantly higher in distal humeral shaft lesions (56%) compared to other humeral locations (15%) (P=.03).

Conclusions:

• PBSS may improve fracture surveillance and reduce radiation scattering but carries a risk of mechanical failure, particularly in the distal humerus.
• Caution is recommended for treating distal humeral pathologic fractures with large lytic lesions and uncontrolled disease.
• Further investigation into implant design and patient selection is warranted to mitigate failure rates.