Table 1 Abductor Moment Arm for Commerical Prostheses and Native Femur
From: Hip abductor moment arm - a mathematical analysis for proximal femoral replacement
| Â | Muscle Division | Position | Abductor Moment Arm (cm) | |||
|---|---|---|---|---|---|---|
| Â | Â | Â | Biomet - Letson | Biomet - Finn | Stryker - GMRS | Native Femur |
|  |  | 30° Adduction | 4.2 | 3.6 | 4.5 | 4.5 |
| Â | Anterior | Neutral | 4.9 | 4.8 | 5.4 | 6.0 |
|  |  | 45° Abduction | 3.5 | 5.2 | 4.4 | 7.4 |
|  |  | 30° Adduction | 3.6 | 2.9 | 3.8 | 3.7 |
Gluteus Medius | Middle | Neutral | 4.7 | 4.3 | 5.1 | 5.4 |
|  |  | 45° Abduction | 4.6 | 5.4 | 5.4 | 7.2 |
|  |  | 30° Adduction | 2.8 | 2.0 | 2.9 | 2.6 |
| Â | Posterior | Neutral | 4.0 | 3.5 | 4.2 | 4.2 |
|  |  | 45° Abduction | 5.0 | 5.0 | 5.5 | 6.2 |
|  |  | 30° Adduction | 4.6 | 4.1 | 5.0 | 5.5 |
| Â | Anterior | Neutral | 5.0 | 5.2 | 5.6 | 7.1 |
|  |  | 45° Abduction | 2.5 | 4.5 | 3.0 | 7.3 |
|  |  | 30° Adduction | 3.8 | 3.0 | 4.0 | 4.0 |
Gluteus Minimus | Middle | Neutral | 4.8 | 4.5 | 5.3 | 6.1 |
|  |  | 45° Abduction | 4.3 | 5.4 | 5.0 | 7.8 |
|  |  | 30° Adduction | 2.7 | 1.8 | 2.8 | 2.4 |
| Â | Posterior | Neutral | 4.0 | 3.4 | 4.3 | 4.5 |
|  |  | 45° Abduction | 5.0 | 5.2 | 5.6 | 6.9 |
|  |  | 30° Adduction | 3.6 | 2.9 | 3.8 | 3.8 |
Mean | All Divisions | Neutral | 4.6 | 4.3 | 5.0 | 5.6 |
|  |  | 45° Abduction | 4.2 | 5.1 | 4.8 | 7.1 |