BACKGROUND
Pain after a posterolateral approach for total hip arthroplasty (THA) may affect early functional recovery. Supra-inguinal fascia iliaca (SFIB) and pericapsular nerve group (PENG) blocks have been proposed as promising analgesia techniques.
OBJECTIVES
This trial was conducted to compare a PENG with a SFIB for controlling postoperative pain and for providing functional recovery.
DESIGN
Noninferiority monocentric randomised controlled study.
SETTING
One hundred and two patients scheduled for a total hip arthroplasty via the posterolateral approach under spinal anaesthesia were prospectively allocated to two groups. Data acquisition occurred between October 2021 and July 2022 at the University Hospital of Liege.
PATIENTS
One hundred and two patients completed the trial.
INTERVENTIONS
Group SFIB received supra-inguinal fascia iliaca block (SFIB) (40 ml ropivacaine 0.375%), whereas group PENG received a PENG block (20 ml ropivacaine 0.75%).
MAIN OUTCOME MEASURES
Rest and mobilisation pain on a 0 to 10 numeric rating scale at fixed time points: 1 and 6 h after surgery, on day-1 and day-2 at 8 a.m.,1 p.m. and 6 p.m. On day-1 and day-2, evolution of quality-of-recovery-15 score was assessed, and timed-up-and-go, 2 and 6 min-walking tests. The noninferiority margin was set as 1 numeric rating scale point 6 h after surgery.
RESULTS
Six hours after surgery, pain scores in group PENG were noninferior to those of group SFIB, with a difference between medians at 0 (95% CI −0.93 to 0.93). There were no significant differences between the groups regarding rest and dynamic pain trajectories during the first 48 postoperative hours, with no significant effects of group (rest P = 0.800; dynamic P = 0.708) or interaction between group and time (rest P = 0.803; dynamic P = 0.187). Similarly, no significant differences were observed regarding motor and functional recovery as assessed by timed-up-and-go (P = 0.197), 2 min (P = 0.364), and 6 min walking (P = 0.347) tests and quality-of-recovery-15 (P = 0.417) score.
CONCLUSION
Following a total hip arthroplasty via the posterolateral approach, a PENG block is noninferior to SFIB regarding postoperative pain control 6 h after surgery, and functional recovery.
TRIAL REGISTRATION
European Clinical Trial Register under EudraCT-number 2020-005126-28 (https://www.clinicaltrialsregister.eu/ctr-search/trial/2020-005126-28/BE).