Osteolysis following PE Wear of a Hastings Head on a Monoblock Hip Stem

Figure 6

Disassembled PE liner of the bipolar head (a) with signs of stem impingement around the opening (b); a 22.225 mm (nominal diameter) sphere fitted into the cross section in the supposed unworn position (c); imprinting of the bipolar head metal surface on the bottom, indicating cold flow of the PE (d).

(a)

(b)

(c)

(d)