Table 1.
Grasp types and sizes
| Type of opposition | Grasp type and aperture size | Grasp ID |
|---|---|---|
| Palm opposition | ||
| All palmar surfaces of the fingers and the palm are involved and the thumb is in opposition to other fingers (as in grasping a bottle). | Palmar Large | PL |
| Palmar Medium | PM | |
| Palmar Small | PS | |
| Side opposition | ||
| The thumb opposes the radial aspect of the index finger (as in grasping a key). | Lateral Large | LL |
| Lateral Medium | LM | |
| Lateral Small | LS | |
| Pad opposition | ||
| The opposition is formed between the fingertips of the thumb and the fingers (as in lifting a pin from a flat surface). | 3-digit Medium (index, middle finger and thumb) | TM |
| 3-digit Small | TS | |
| 2-digit (index finger and thumb) | B | |