Historically, most artificial hip implants had a stem and neck made of a single piece of metal, like this.

In 2000, Profemur introduced a design that made the neck a separate, detachable

part that fit into an alcove in the stem.2

But some experts say this change added a weak spot.3 Some necks snapped off where they fit into the stem.3

Others allegedly corroded in the alcove and had to be replaced.3

Historically, most artificial hip implants had a stem and neck made of a single piece of metal, like this.

In 2000, Profemur introduced a design that made the neck a separate, detachable

part that fit into an alcove in the stem.2

But some experts say this change added a weak spot.3

Some necks snapped off where they fit into the stem.3

Others allegedly corroded in the alcove and had to be replaced.3

Historically, most artificial hip implants

had a stem and neck made of a single

piece of metal, like this.

Neck

Stem

In 2000, Profemur introduced a design that

made the neck a separate, detachable part

that fit into an alcove in the stem.2

But some experts say this change added a weak spot.3 Some necks snapped off where they fit into the stem.3

Others allegedly corroded in the alcove and had to be replaced.3