3D preoperative planning for shoulder arthroplasty: an evaluation of different planning software systems

BackgroundOptimal glenoid component positioning in shoulder arthroplasty can sometimes be challenging. 3D preoperative planning and patient-specific instruments can help position the glenoid component more accurately. Multiple medical companies have developed their method of performing preoperative glenoid measurements. The goal of this study was to compare those different measurement techniques for inclination and version measurements.MethodsCT scans of 13 cadaveric shoulders were used for 3D analysis. All CT scans were sent to different companies that agreed to participate in this study. Each company was expected to report on their methods and measure the preoperative glenoid inclination and version. Furthermore, the researchers calculated preoperative inclination and version of these shoulders using 2 different methods. The measurements were statistically analyzed to determine differences between all methods in a pairwise manner.ResultsSix methods were evaluated in a pairwise manner, resulting in 15 pairs being analyzed. 10 pairs differed significantly for inclination (P < .008), and 4 pairs differed significantly for version (P < .008).ConclusionThere are significant differences between measurement techniques concerning preoperative glenoid inclination and version. The knowledge that different companies use different measurement techniques for preoperative 3D planning of shoulder surgery is essential and should be taken into account when using different planning systems.Level of evidenceLevel III; Study of Diagnostic Test