Table 3 Implant micromotion, cement and bone stresses, and critical cement volume for all-polyethylene and hybrid glenoid components among all patients and load configurations
All-polyethylene components | Hybrid components | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
U-PG | U-KG | A-KG | I-KG | E-hCG | I-hPG | |||||||||||||||||||
mean | ± SD | (range) | mean | ± SD | (range) | mean | ± SD | (range) | mean | ± SD | (range) | mean | ± SD | (range) | mean | ± SD | (range) | |||||||
Stresses | ||||||||||||||||||||||||
Cement stress (MPa) | 3.6 | ± 0.9 | (2.0 | – 5.3) | 3.8 | ± 0.9 | (2.4 | – 6.0) | 3.6 | ± 0.5 | (2.6 | – 4.4) | 3.6 | ± 0.6 | (2.7 | – 4.5) | 2.8 | ± 1.6 | (0.9 | – 7.9) | 2.9 | ± 1.0 | (1.2 | – 5.8) |
Cortical bone (MPa) | 1.8 | ± 0.3 | (1.4 | – 2.5) | 1.8 | ± 0.3 | (1.1 | – 2.6) | 1.8 | ± 0.3 | (1.4 | – 2.6) | 1.8 | ± 0.4 | (1.2 | – 2.7) | 1.8 | ± 0.3 | (1.4 | – 2.5) | 1.7 | ± 0.3 | (1.2 | – 2.5) |
Trabecular bone (MPa) | 0.8 | ± 0.2 | (0.4 | – 1.1) | 0.8 | ± 0.2 | (0.4 | – 1.1) | 0.8 | ± 0.2 | (0.4 | – 1.3) | 0.8 | ± 0.2 | (0.4 | – 1.1) | 0.8 | ± 0.2 | (0.5 | – 1.4) | 0.7 | ± 0.2 | (0.3 | – 1.0) |
Micromotion | ||||||||||||||||||||||||
Glenoid micromotion (µm) | 11.6 | ± 12.3 | (0.2 | – 48.7) | 11.1 | ± 11.2 | (0.4 | – 43.5) | 8.6 | ± 8.6 | (0.2 | – 45.0) | 12.5 | ± 11.0 | (0.8 | – 59.7) | 12.9 | ± 15.3 | (0.4 | – 93.8) | 7.9 | ± 7.4 | (0.5 | – 33.2) |
Failure analysis | ||||||||||||||||||||||||
%CCV (> 4 MPa) | 39.6 | ± 7.4 | (25 | – 53) | 43.0 | ± 10.5 | (25 | – 59) | 42.5 | ± 12.2 | (20 | – 63) | 44.5 | ± 13.5 | (21 | – 66) | 32.5 | ± 17.0 | (8 | – 65) | 34.8 | ± 14.8 | (6 | – 68) |