Table 1.
Demographic data
| Parameters | Numbers |
|---|---|
| Number of patients (hips) | 120 (130) |
| Male:female | 66:54 |
| Age (years) (mean ± SD [range]) | 59 ± 18 (36–67) |
| Height (cm) (mean ± SD [range]) | 171 ± 9 (155–185) |
| Weight (kg) (mean ± SD [range]) | 82 ± 10 (65–125) |
| BMI (kg/m2) (mean ± SD [range]) | 28 ± 5 (27–37) |
| Primary diagnosis (number [%] of patients/number of hips) | 13 (52.5) |
| Osteonecrosis of femoral head | 78 (65)/85 |
| Osteoarthritis | 30 (25)/32 |
| Traumatic arthritis | 6 (5)/6 |
| Multiple epiphyseal dysplasia | 6 (5)/7 |
| Type of bone defect (Paprosky [24]) | |
| IIIB | 70 hips (54%) |
| IV | 60 hips (46%) |
| Reasons for revision (number of hips) | |
| Aseptic loosening | 126 (97%) |
| Periprosthetic fracture | 4 (3%) |
| Number of revisions | |
| First | 79 hips (61%) |
| Second | 27 hips (21%) |
| Third | 12 hips (9%) |
| Fourth | 12 hips (9%) |
| Number of strut grafts used | |
| One | 13 hips (10%) |
| Two | 98 hips (75%) |
| Three | 19 hips (15%) |
| Zones of allograft (modified Gruen zone [24]) | |
| 1 | Lateral proximal 1/3 |
| 2 | Lateral middle 1/3 |
| 3 | Lateral distal 1/3 |
| 4 | Around the stem tip |
| 5 | Medial distal 1/3 |
| 6 | Medial middle 1/3 |
| Grading of allograft resorption | |
| Mild | < 50% of allograft thickness in 1 or 2 zones |
| Moderate | < 50% of thickness of allograft in > 2 zones or > 50% of thickness, but not full thickness in 1 or 2 zones |
| Severe | Full thickness in any zone or > 50% of the thickness in > 2 zones |
| Followup (years) | 16.1 (12–20) |