Article

Patient-Specific Guides/Instrumentation in Shoulder Arthroplasty

Publish date: February 26, 2018

References

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Denard and colleagues³⁰ compared the preoperative glenoid version and inclination measurements obtained using the Blueprint 3D Planning + PSI software and the VIP System 3D planning software. They analyzed the preoperative CT scans of 63 consecutive patients undergoing either TSA or reverse TSA using both the Blueprint and the VIP System 3D planning software and compared the resulting native glenoid version and inclination measured by the software. They found a statistically significant difference (P = 0.04) in the version measurements provided by the different planning software; however, the differences found in inclination did not reach statistical significance (P = 0.463). In 19 of the 63 patients (30%), the version measurements between the systems were >5°, and in 29 of the 63 patients (46%), the inclination measurements between the systems were 5° or greater. In addition, 12 of the 63 patients (19%) had both version and inclination measurement differences of >5° between the systems. In total, they found that 35 of the 63 patients had at least 1 measurement that varied by >5° between the systems, and that in 15 patients (24%), 1 measurement varied by >10°. Their data demonstrate considerable variability in the preoperative measurements provided by different 3-D planning software systems, and that further study of each commercially available 3-D planning software system is needed to evaluate their accuracy.

CONCLUSION

Optimal outcomes following TSA and reverse TSA are dependent on proper implant position. Multiple studies have demonstrated improved accuracy in implant positioning with the use of patient-specific guides compared to that with traditional methods. Currently, there are no studies comparing the clinical outcomes of patient-specific guides to those of traditional methods of glenoid placement, and limited research had been done comparing the accuracy of each system’s 3-D planning software with each other and with standardized measurements of glenoid version and inclination. Further research is required to determine the accuracy of each commercially available 3-D planning software system as well as the clinical benefit of patient-specific guides in shoulder arthroplasty.