What displacement is achieved with R3 Lateralized Liners?

What displacement is achieved with R3 Lateralized Liners?

• A. +2 mm
• B. +4 mm
• C. 0 mm
• D. +6 mm

Answer: (B)

Lateralizing a liner moves the hip’s center of rotation a bit away from the pelvis, which increases the femoral offset and strengthens the abductor muscle lever arm. This helps improve stability and reduce risk of dislocation after hip replacement, while also tuning joint mechanics to feel more natural. R3 Lateralized Liners are designed to provide about four millimeters of lateral displacement. That amount is chosen to strike a balance: it’s enough to noticeably improve soft-tissue tension and stability, without overdoing the shift, which could stress other structures or alter biomechanics more than desired. Smaller shifts, like a couple of millimeters, might not achieve the stabilizing effect, while larger shifts could introduce new issues. So the four-millimeter lateralization is the specific displacement delivered by this liner.

Lateralizing a liner moves the hip’s center of rotation a bit away from the pelvis, which increases the femoral offset and strengthens the abductor muscle lever arm. This helps improve stability and reduce risk of dislocation after hip replacement, while also tuning joint mechanics to feel more natural.

R3 Lateralized Liners are designed to provide about four millimeters of lateral displacement. That amount is chosen to strike a balance: it’s enough to noticeably improve soft-tissue tension and stability, without overdoing the shift, which could stress other structures or alter biomechanics more than desired.

Smaller shifts, like a couple of millimeters, might not achieve the stabilizing effect, while larger shifts could introduce new issues. So the four-millimeter lateralization is the specific displacement delivered by this liner.