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PSI guidance, 3-D preoperative surgical planning reduced glenoid component variability
Variability in glenoid component inclination was reduced and inclination errors were avoided for total and reverse shoulder arthroplasty when 3-D preoperative surgical planning and patient-specific instrument guidance were used, according to results.
Researchers analyzed 36 shoulder arthroplasties, of which 18 underwent 3-D preoperative planning and patient-specific instrument (PSI) guidance to position the central guide pin (PSI group) and 18 patients underwent standard preoperative planning and instrumentation for implantation of the glenoid component (non-PSI group). Using the angle between the glenoid baseplate and the floor of the supraspinatus fossa on postoperative radiographs, two observers measured the inclination of the glenoid component.
Olivier Verborgt
Overall, patients who underwent total shoulder arthroplasty and reverse shoulder arthroplasty had good intra-class correlation between the radiographic and 3-D measurements. For total shoulder arthroplasty, results showed an average angle beta of approximately 74 for the PSI group and approximately 86 for the non-PSI group. Researchers also found patients who underwent reverse should arthroplasty had an average angle beta of approximately 83 in the PSI group and approximately 90 in the non-PSI group. Patients in the non-PSI group were more likely to experience extreme values of glenoid component inclination for both total shoulder and reverse shoulder arthroplasty compared with patients in the PSI group. – by Casey Tingle
Disclosure: The researchers report no relevant financial disclosures.