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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 2 The percentage of acceptable implants for every stem design (every single parameter was evaluated; the last row shows the percentages of acceptable implants that matched all six criteria)

From: Which stem in total hip arthroplasty for developmental hip dysplasia? A comparative study using a 3D CT-based software for pre-operative surgical planning

Reconstructive parameter Acceptable Stem design Chi-square test
Single wedge Anatomical Conical
Combined anteversion Yes 153 (76.5%) 121 (60.5%) 197 (98.5%) p < 0.0001
No 47 (22.5%) 79 (39.5%) 3 (1.5%)
Offset restoration Yes 192 (96%) 164 (82%) 186 (93%) p < 0.0001
No 8 (4%) 36 (18%) 14 (7%)
Coronal tilt Yes 200 (100%) 200 (100%) 199 (99.5%) p = 0.367
No 1 (0.5%)
Sagittal tilt Yes 199 (99.5%) 200 (100%) 199 (99.5%) p = 0.605
No 1 (0.5%) 1 (0.5%)
Canal filling Yes 199 (99.5%) 177 (88.5%) 198 (99%) p < 0.0001
No 1 (0.5%) 23 (11.5%) 2 (1%)
Leg lengthening Yes 188 (94%) 183 (91.5%) 194 (97%) p = 0.063
No 12 (6%) 17 (8.5%) 6 (3%)
All the parameters Yes 138 (69%) 88 (44%) 174 (87%) p < 0.0001
No 62 (31%) 112 (56%) 26 (13%)