Table 3 Abductor Moment Arm with Medialization of Femoral Head
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 | 4.6 | 4.5 | 4.9 | 5.5 |
| Â | Anterior | Neutral | 5.0 | 5.0 | 5.4 | 6.3 |
|  |  | 45° Abduction | 4.1 | 5.4 | 5.0 | 7.3 |
|  |  | 30° Adduction | 4.1 | 3.9 | 4.4 | 4.7 |
Gluteus Medius | Middle | Neutral | 4.7 | 4.6 | 5.1 | 5.8 |
|  |  | 45° Abduction | 4.9 | 5.4 | 5.6 | 7.0 |
|  |  | 30° Adduction | 3.4 | 3.1 | 3.6 | 3.7 |
| Â | Posterior | Neutral | 4.0 | 3.9 | 4.3 | 4.6 |
|  |  | 45° Abduction | 4.9 | 4.8 | 5.2 | 5.7 |
|  |  | 30° Adduction | 4.8 | 4.8 | 5.3 | 6.3 |
| Â | Anterior | Neutral | 5.0 | 5.3 | 5.6 | 7.3 |
|  |  | 45° Abduction | 3.3 | 4.8 | 3.8 | 7.5 |
|  |  | 30° Adduction | 4.2 | 3.9 | 4.6 | 5.1 |
Gluteus Minimus | Middle | Neutral | 4.8 | 4.8 | 5.3 | 6.4 |
|  |  | 45° Abduction | 4.8 | 3.4 | 5.4 | 7.7 |
|  |  | 30° Adduction | 3.3 | 2.9 | 3.5 | 3.6 |
| Â | Posterior | Neutral | 4.1 | 3.8 | 4.4 | 4.9 |
|  |  | 45° Abduction | 5.0 | 5.0 | 5.5 | 6.5 |
|  |  | 30° Adduction | 4.1 | 3.9 | 4.4 | 4.8 |
Mean | All Divisions | Neutral | 4.6 | 4.6 | 5.0 | 5.9 |
|  |  | 45° Abduction | 4.5 | 4.8 | 5.1 | 7.0 |