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Goals

Acetabulum

Lewinnek safe zone

- inclination 40+/-10 degrees

- anteversion 15+/-10 degrees

Minimize leg length discrepancy

Causes gait disturbance and lower back pain

Restore offset

Options

Intra-operative fluoroscopy

Image-less optical navigation

CT based navigation

Aim

Attempt to reduce outliers in all 3 planes of the knee

- improve alignment

- theoretically improve survival and outcomes

Types

Image based

Pre-op CT

- uncommon

- resource heavy