Table 2.
Main characteristics of the six patients where implantation of a BioballTM system was specifically performed to restore a diminished femoral offset. The Merle d‘Aubigné score provides an assessment of hip function. The score is considered excellent if equal to 18, very good if equal to 17, good if between 15 and 16, average if between 13 and 14, poor if between 9 and 12, and very poor if < 9
| n | Sex | Age | BMI | Indication for THA | Comorbidities | Hip approach | Stem offset | Taper | Head Diameter (mm) | Offset of the native hip | Offset after THA (offset decrease in mm, % decrease) |
Offset after revision with BioballTM | Merle d’Aubigné after THA (pain–mobility–gait (overall)) |
Merle d’Aubigné after revision with BioballTM (pain–mobility–gait (overall)) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | M | 65 | 34.8 | Perthes | Obesity, lumbar arthropathy | AL | STD | 12/14 | 36 | 32.4 |
27.7 (4.7, 14.5%) |
33.2 | 4–6–5 (15) | 6–6–6 (18) |
| 2 | F | 52 | 19.7 | Dysplasia | None | AL | STD | 12/14 | 36 | 40.0 |
33.8 (6.2, 15.5%) |
40.0 | 3–6–3 (12) | 6–6–6 (18) |
| 3 | M | 72 | 29.4 | OA | Multiple sclerosis | AL | STD | 12/14 | 36 | 38.9 |
31.9 (7.0, 18.0%) |
41.8 | 3–4–1 (8) | 5–4–0 (9) |
| 4 | M | 73 | 28.7 | OA | OSAS | AL | STD | 12/14 | 36 | 43.2 |
34.1 (9.1, 21.1%) |
37.2 | 4–6–6 (16) | 6–6–6 (18) |
| 5 | M | 83 | 26.9 | Femoral neck fracture | Stroke, lumbar arthrodesis | AL | STD | 12/14 | 32 | 38.8 |
34.8 (4.0, 10.3%) |
38.1 | 6–6–4 (16) | 6–6–4 (16) |
| 6 | M | 70 | 25.6 | OA | Diabetes mellitus | AL | HO | 12/14 | 36 | 48.3 |
39.5 (8.8, 18.2%) |
48.5 | 3–6–4 (13) | 6–6–6 (18) |
M male, F femalem, AL anterolateral, OA osteoarthritis, OSAS obstructive sleep apnea syndrome, THA total hip arthroplasty, STD standard, HO high offset