Related Experiment Video
Updated: Jun 8, 2026
07:43
In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
Hip offset in total hip arthroplasty: quantitative measurement with navigation.
Manish Dastane1, Lawrence D Dorr, Rupesh Tarwala
1The Arthritis Institute at Good Samaritan Hospital, 637 S Lucas Avenue, 5th Floor, Los Angeles, CA 90017, USA.
Clinical Orthopaedics and Related Research
|September 17, 2010
Summary
Reconstructing hip offset in total hip arthroplasty (THA) is directly linked to the center of rotation (COR). Computer navigation enables precise control of hip offset and length, crucial for successful THA outcomes.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Radiographic Analysis
Background:
- Femoral offset in total hip arthroplasty (THA) is influenced by the cup's center of rotation (COR).
- Hip offset, encompassing both femoral offset and COR changes, is a critical measurement for THA success.
- Abductor muscle function, wear, and impingement are associated with offset in THA.
Purpose of the Study:
- To determine if hip offset in arthritic hips correlates with the cup's COR.
- To assess if hip offset can be balanced within 6 mm of the contralateral normal hip.
- To evaluate if hip length can be maintained within 6 mm of the contralateral side.
Main Methods:
- Radiographic comparison of hip offset in 82 arthritic hips versus contralateral normal hips.
- Utilized computer navigation in all THA procedures.
- Quantitatively assessed hip offset changes relative to COR displacement.
Main Results:
- Postoperative hip offset change averaged 1.4 ± 6.4 mm, with 78 of 82 hips within ± 6 mm.
- Superior COR displacement required substantial offset increase.
- Achieving consistent offset within 5 mm required COR positioned 0-3 mm superior and 0-5 mm medial.
Conclusions:
- Hip offset reconstruction is directly dependent on the hip's COR position.
- Computer navigation provides quantitative control over hip offset and length restoration.
- Accurate COR positioning is essential for predictable hip offset reconstruction.
