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Acetabular component orientation and position are important factors in the short- and long-term outcomes of total hip arthroplasty.
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Different definitions of inclination and anteversion are used in the orthopaedic literature and surgeons should be aware of these differences and understand their relationships.
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There is no universal safe zone.
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Preoperative planning should be used to determine the optimum position and orientation of the cup and assess spinopelvic characteristics to adjust cup orientation accordingly.
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A peripheral reaming technique leads to a more accurate restoration of the centre of rotation with less variability compared with a standard reaming technique.
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Several intraoperative landmarks can be used to control the version of the cup, the most commonly used and studied is the transverse acetabular ligament.
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The use of an inclinometer reduces the variability associated with the use of freehand or mechanical alignment guides.
