Table 1 Patient demographics, and preoperative clinical scores and radiographic measurements stratified by stem type
|  | Conventional stem n = 395 | Shortened stem n = 386 | p-value | ||
|---|---|---|---|---|---|
Mean ± SD | (Range) | Mean ± SD | (Range) | ||
n (%) | n (%) | ||||
Age | 64.6 ± 13.6 | (19.2–92.5) | 64.6 ± 13.2 | (19.8–94.9) | 0.879 |
Body mass index (BMI) | 26.2 ± 4.8 | (15.2–56.8) | 26.1 ± 4.3 | (16.4–44.4) | 0.904 |
Sex | Â | Â | Â | Â | 0.720 |
 Female | 203 (51.4%) |  | 192 (49.7%) |  |  |
 Male | 192 (48.6%) |  | 194 (50.3%) |  |  |
Charnley comorbidity classification |  |  |  |  |  < 0.001 |
 A | 240 (60.8%) |  | 184 (47.7%) |  |  |
 B | 136 (34.4%) |  | 135 (35.0%) |  |  |
 C | 19 (4.8%) |  | 67 (17.4%) |  |  |
Surgical indication | Â | Â | Â | Â | 0.007 |
 Avascular necrosis | 24 (6.1%) |  | 14 (3.6%) |  |  |
 Primary OA | 304 (77.0%) |  | 333 (86.3%) |  |  |
 Rapidly destructive OA | 22 (5.6%) |  | 12 (3.1%) |  |  |
 Rheumatoid arthritis | 3 (0.8%) |  | 3 (0.8%) |  |  |
 Secondary OA due to acetabular protrusio | 17 (4.3%) |  | 4 (1.0%) |  |  |
 Secondary OA due to hip dysplasia | 25 (6.3%) |  | 20 (5.2%) |  |  |
Modified Harris hip score | 56.5 ± 18.5 | (12–95) | 64.5 ± 13.5 | (14–90) |  < 0.001 |
Canal calcar ratio (CCR) | 0.48 ± 0.10 | (0.28–0.84) | 0.48 ± 0.09 | (0.28–0.76) | 0.984 |
Cortical thickness index (CTI) | 0.55 ± 0.09 | (0.12–0.75) | 0.58 ± 0.08 | (0.27–0.78) |  < 0.001 |
Dorr classification | Â | Â | Â | Â | 0.007 |
 A | 114 (28.9%) |  | 145 (37.6%) |  |  |
 B | 241 (61.0%) |  | 192 (49.7%) |  |  |
 C | 40 (10.1%) |  | 49 (12.7%) |  |  |
Femoral offset | 47.1 ± 9.3 | (19.4–92.0) | 48.6 ± 10.6 | (26.3–108.0) | 0.137 |
Limb length discrepancy (LLD) | -1.5 ± 4.8 | (-28.1–16.6) | -2.21 ± 5.1 | (-45.4–8.9) | 0.115 |