How Does Customized Cutting Guide Design Affect Accuracy and Ergonomics in Pelvic Tumor Resection? A Study in...

Area of Science:

• Orthopedic oncology
• Surgical instrumentation
• Biomedical engineering

Background:

• Customized cutting guides enhance safety and reliability in pelvic bone tumor resections.
• Two primary designs exist: heavier block-type and lighter patch-type guides.
• Evidence on design impact on accuracy and ergonomics requires further investigation.

Purpose of the Study:

• To compare the accuracy of patch-type versus block-type customized cutting guides in pelvic bone tumor resection.
• To evaluate the ergonomic differences and surgical usability of patch-type versus block-type guides.

Main Methods:

• An experimental cadaver study utilized five whole-body specimens with simulated tumors in pelvic bone areas (Enneking Zones I, II, and IV).
• Resection accuracy was assessed via CT scan analysis of margin deviation.
• Intraoperative ergonomic scores were recorded using a 0-100 scale.

Main Results:

• Patch guides showed slightly better accuracy, with less deviation from planned margins (1mm vs 2mm at closest point, p=0.02; 3mm vs 4mm max deviation, p=0.002).
• Patch guides were rated as more ergonomic (median 92% vs 84%, p=0.03).
• These advantages were more pronounced in complex pelvic zones (I and IV).

Conclusions:

• Patch-type customized cutting guides demonstrate comparable accuracy and ergonomics to block-type guides, with slight advantages.
• The patch design may facilitate achieving negative oncologic bony margins due to thinner bone contact and reduced dissection.
• Results from this cadaver study require independent replication due to the small sample size.