Comparison of Mini-Incision Total Hip Arthroplasty Through an Anterior Approach and a Posterior Approach Using Navigation

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Methods

The authors reviewed the results of MIS-THAs performed by a single surgeon between January 2005 and April 2007 using a CT-based navigation system (CT-HIP, version 1.0, Stryker Navigation, Freiburg, Germany) with the same aiming orientation for the cups. The MPA group consisted of 39 consecutive patients and the MAA group consisted of 33 consecutive patients. The skin incision ranged from 8 cm to 10 cm, with an average of 9 cm in either group. In the MPA group, repair of the external rotators

Results

All patients were followed for at least 2 years. There were no infections or pulmonary embolisms in either group. There were no navigation-related complications. There were no failures in using navigation, including loosening of the trackers or software or hardware errors. The average cup inclination and anteversion recorded using navigation were 38.4° (range, 33.3° to 46.6°) and 13.8° (range, 5.8° to 17.4°), respectively, in the MPA group, and 38.4° (range, 34.7° to 42.6°) and 14.8° (range,

Discussion

One of the claimed benefits of MIS is soft-tissue preservation, and the use of MIS may lead to increased stability, resulting in a reduced incidence of dislocation. On the other hand, MIS may increase a risk of implant malpositioning or malorientation, which may lead to an increased dislocation rate. In this study, the authors' wanted to identify any intraoperative or postoperative differences between the MPA and the MAA after eliminating malorientation of the cup using navigation. Although it

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