The Incision Point

The Incision Point

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Beyond the 0.70 Threshold: Exposing the Head-Cup Ratio Protecting THA Patients

How matching a highly calibrated head-to-cup diameter proportion above 0.70 isolates and neutralizes joint luxation risks.

Dr. Michael Meneghini's avatar
Dr. Michael Meneghini
Sep 19, 2026
∙ Paid

Total hip arthroplasty (THA) has firmly cemented its reputation as the uncontested “operation of the century,” celebrated for generating exceptional multi-decade implant survivorship, high patient satisfaction scores, and unparalleled structural cost-effectiveness. Yet, despite this historical track record, post-operative instability remains a devastating complication that historically penalizes up to 10% of primary interventions. It stands as one of the leading drivers of expensive, early aseptic revision surgeries across the United States.

This instability risk is historically elevated when executing a traditional posterior approach. While alternative entries like the direct anterior pathway have grown in popularity from early claims of lower dislocation tracking, they carry non-trivial clinical trade-offs, frequently logging significantly higher surgical blood loss, extended operative case times, and elevated risks for catastrophic early femoral implant failure.

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