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Figure 4: Wear intensity ( 𝐼 ) of UHMWPE specimens: pure (1) and N + ion implanted with doses of 0.5 (2), 1 (3), 2 1 0 1 7 (4); nanocomposites UHMWPE +0.5 wt.% HA in the initial state (5) and implanted one with doses 0.5 (6), 1 (7), 2 1 0 1 7 N + (8); microcomposites UHMWPE +20 wt.% HA without surface treatment (9) and implanted ones with doses of 0.5 (10), 1 (11), 2 1 0 1 7 N + (12) at the steady-state wearing stage.