Salvage of total hip instability with a constrained acetabular component

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Reconstructive Surgery

Background:

• Recurrent hip dislocation and instability pose significant challenges in total hip arthroplasty.
• Existing treatment options may be insufficient for severe cases, necessitating advanced solutions.

Purpose of the Study:

• To evaluate the efficacy and safety of constrained acetabular components in managing hip instability.
• To assess the rate of recurrent dislocation and component loosening in patients receiving these implants.

Main Methods:

• A retrospective study involving 101 constrained acetabular components implanted in 98 patients between April 1988 and February 1993.
• Patients were followed for a minimum of 2 years, with an average clinical follow-up of 61 months.
• Indications included recurrent dislocation (56 cases), intraoperative instability (38 cases), and neurologic impairment (7 cases).

Main Results:

• Overall failure rate was 4% (4 of 101 components).
• In cases of recurrent dislocation, 96% (54 of 56) achieved successful outcomes with no further dislocations.
• Short-term radiographic follow-up revealed no increased incidence of femoral or acetabular component loosening.

Conclusions:

• Constrained acetabular components are a highly effective salvage option for managing severe hip instability.
• Judicious use is recommended for patients with recurrent dislocations or significant instability post-total hip arthroplasty.
• The component demonstrates a favorable short-term radiographic profile regarding loosening.