Usefulness of modular neck adapter in partial hip revision

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Arthroplasty research

Background:

• Modular neck adapters facilitate adjustments in length and offset for stable total hip arthroplasty (THA).
• These devices enable rapid partial hip revision without removing existing components.
• Limited literature exists on the long-term outcomes of these modular systems.

Purpose of the Study:

• To review current literature on modular neck adapters in partial total hip arthroplasty revision (THAr).
• To focus on indications, clinical and radiological outcomes, and complications associated with these devices.

Main Methods:

• A narrative review of literature published between 01/01/2000 and 01/12/2022.
• Searched electronic databases using terms like "Head neck taper" and "Merete BioBall" in conjunction with "revision Total Hip Arthroplasty."
• Included studies on the Merete BioBall system in hip revision surgery, excluding modular stem prostheses.

Main Results:

• The surgical procedure is safe, quick, and allows correction of stem version, length, and offset, along with soft tissue tensioning.
• Clinical and radiological outcomes are generally good, with low rates of complications.
• The system is effective for recurrent THA dislocations, especially in second revision surgeries, and for isolated acetabular cup revisions.

Conclusions:

• Modular neck adapters are a viable surgical option for THA revision, particularly for recurrent dislocations and acetabular component issues.
• Potential complications include re-dislocation (5.2%–15%) due to inadequate correction; however, corrosion or fretting have not been reported.
• The primary indication remains isolated acetabular cup revision, offering a less invasive revision strategy.