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Assemblage of MOM Wear Evidence

THA

RA

1

Hip subluxation in functional standing and sitting postures

yes

yes

2

Wear patterns defining in-vivo component positions

yes

yes

3

Notching mechanism in femoral necks

yes

-

4

Pits, microgrooves and plastically-deformed gouges

yes

yes

5

Cup positions defining femoral-neck impingements

yes

yes

6

Evidence of metal debris circulating in the hip joint

yes

yes

7

Demonstrating spino-pelvic/hip motions at impingement

yes

yes

8

Discussion of MOM wear mechanisms