Anterior hip replacement: lower dislocation rates despite less restrictions?

Area of Science:

• Orthopedic Surgery
• Arthroplasty Research
• Surgical Complications

Background:

• Dislocation is a frequent complication following total hip arthroplasty (THA), often necessitating revision surgery.
• The direct anterior approach (DAA) has gained significant traction in recent years for THA procedures.
• Comparing dislocation rates between surgical approaches is crucial for patient outcomes.

Purpose of the Study:

• To compare the one-year postoperative dislocation rates between the direct anterior approach and the posterior approach in total hip arthroplasty.
• To evaluate the efficacy of the direct anterior approach in reducing dislocation risk.
• To assess the impact of surgical approach on early postoperative stability.

Main Methods:

• A retrospective comparison of 797 total hip arthroplasties (THAs) via posterior approach (2009-2012) with 690 THAs via direct anterior approach (since 2012).
• Patient selection for the anterior approach included those seeking enhanced flexibility or with higher dislocation risk.
• One-year follow-up was utilized to record and compare dislocation events.

Main Results:

• The posterior approach group experienced eight dislocations (1%) out of 797 THAs within one year.
• The direct anterior approach group had zero dislocations (0%) out of 690 THAs during the same period (p=0.008).
• Dislocations in the posterior group occurred at an average of 7.5 weeks, with five requiring revision surgery for instability.

Conclusions:

• The direct anterior approach is associated with a significantly lower rate of dislocation in the first year post-THA.
• This benefit was observed even when the anterior approach was used in a higher-risk patient cohort.
• The findings suggest the direct anterior approach may offer improved early stability in total hip arthroplasty.