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Glenoid motion occurs at high levels of rotation after TSA despite good outcomes
Early glenoid component motion occurs during high levels of motion despite good short-term clinical outcomes after total shoulder arthroplasty, according to study results.
Researchers prospectively studied glenoid component stability in 11 patients who underwent total shoulder arthroplasty (TSA). At 6 months, 1-year, 2 years and 3 years, patients were evaluated with radiostereometric analysis. Mean follow-up was 50.2 months.
American Shoulder and Elbow Surgeons score, VAS pain score, and active range of motion in forward flexion, external rotation and internal rotation were recorded preoperatively and at follow-up visits to measure outcomes. At the follow-ups, radiographs were evaluated for radiolucencies. Five patients did not reach motion thresholds and were placed in low- motion group, whereas six patients surpassed them and put in the high-motion group
Radiostereometric analysis showed mean translational at 3 years along the x-axis was 0.51mm, 0.44mm at the y-axis and 0.42 mm at the z-axis. Around the x-axis, the mean rotational motion was 2.63°, 1.55° at the y-axis and 3.31° at the z-axis. At the 3-year follow-up, one component translated more than 1 mm in all three axes. After 1 -year, one component had more than 2° of rotational motion in at least one axis, 3 components after 2 years and 6 components at 3 years.
Patients showed good clinical outcomes; ASES scores improved as well mean VAS pain score, active forward flexion, mean active external rotation and mean internal rotation. At 1-year, radiolucencies were not found in any component, in six components at 2 years and in five components at 3 years.
Of the six patients in the high-motion group, radiolucencies were found in four, while radiolucencies were found in one of five components in the low-motion group, according to researchers. ‒ by Monica Jaramillo
Disclosures: The researchers report no relevant financial disclosures.