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Table 1 REFA classification

From: Occupational consequences after isolated reconstruction of the insufficient posterior cruciate ligament

Grade Work intensity Example
0 Work without special physical strain Work without load, like desk work
1 Work with small physical strain Handling light work pieces; also lengthy standing or walking around
2 Work with moderate physical strain Handling of 1–3 kg control device; carrying loads of 10–15 kg; climbing stairs or ladders without load
3 Work with hard physical strain Carrying loads of 20–30 kg, shovelling, digging, chipping, climbing stairs or ladders with moderate load, moderate work in tense work posture
4 Work with most heavy physical strain Carrying loads of more than 50 kg, climbing with heavy load, Hard work in tense work posture