If it's an extrajoint fracture, it's relatively easy to handle because no assembly is needed. However, intraarticular fractures are different. Any irregularities could wear down the joint and once it is worn down, it can cause long-term pain and disability. Intra-articular fractures require surgical reduction, that is, the pieces should be rejoined exactly as they were before the fracture.
If the bone can't be reassembled, even missing a tiny bit could result in arthritis; if a bigger piece is missing, it could lead to disability.
From intensive training within the system, Yang Ping found that assembling bone fragments followed some rules. The order of the reductions and the distribution of the Kirschner wires mattered the most. The whole process was like solving a Rubik's cube; there must be a scientific order, it can't be approached haphazardly.
What appears simple usually requires tremendous effort.