A Comparison of Postoperative Outcomes Between Supine and Lateral Patient Positioning in Total Hip Arthroplasty Using the Anterior-Based Muscle Sparing Surgical Approach.

Background: To determine any differences in clinical outcomes between patients in the supine vs the lateral position during anterior-based muscle sparing (ABMS) total hip arthroplasty (THA).

Methods: A retrospective review was performed of 368 patients undergoing THA via the ABMS approach (201 lateral vs 167 supine position) at our institution (2015-2019) with a minimum follow-up of 12 months. Inclusion criteria were all patients undergoing primary THA. Exclusion criteria were any revision surgeries and patients who did not undergo the ABMS THA. Outcomes assessed were postoperative complication rates, ambulation distance, length of stay, and Western Ontario and McMaster Universities Osteoarthritis Index pain, stiffness, and physical function scores at 3 time periods (preoperative, 3 months postoperative, and 1 year postoperative).

Results: The supine group had significantly greater postoperative day 0 ambulation distance (150 vs 60 meters; < .001), while no difference was observed on postoperative day 1 (210 meters in supine vs 200 in lateral;  = .921). Median length of stay was significantly shorter in the supine group (1; interquartile range 0-1) with respect to the lateral group (1; interquartile range 0-2; < .001). The in-hospital complication rates (2.4% in supine vs 1.5% in lateral;  = .780), return to operating room rates (2.4% in supine vs 1.5% in lateral;  = .780), and readmission rates (5.4% in supine vs 5.0% in lateral;  = .631) were not significantly different between the groups. No significant differences were observed across any Western Ontario and McMaster Universities Osteoarthritis Index scores.

Conclusions: Both supine and lateral patient positioning provide acceptable early surgical outcomes, suggesting that satisfactory results can be obtained via both positions in THAs.