Intraoperative Monitoring and Intra-abdominal Fluid Extravasation During Hip Arthroscopy.

OBJECTIVE: To evaluate the relationship between the intraoperative monitoring factors with intra-abdominal fluid extravasation (IAFE) in patients who underwent hip arthroscopy. The secondary purpose was to describe the main intraoperative variables between cases with and without IAFE. METHODS: We carried out a prospective observational study of 106 hip arthroscopies between June 2017 and June 2018. Within procedures, 54 cases with deep gluteal syndrome (DGS) were included. Ultrasonography was performed by a trained anesthesiologist before and after the surgery to identify the presence of fluid. The hepatorenal (Morison's pouch), splenorenal, retroaortic, suprapubic (longitudinal and transverse), and pleural spaces were examined. During the surgery, the blood pressure, heart rate, temperature, peak inspiratory pressure (PIP), pulmonary compliance, oxygen saturation, and end-tidal carbon dioxide were registered. RESULTS: The incidence of IAFE was 31.1% (33/106; 95% confidence interval 23.0%-40.5%). IAFE in cases with isolated FAI was 15.9% (7/44) in comparison with 52.9% (9/17) of the cases with isolated DGS. Maximum values of PIP greater than 20 mm Hg were associated with fluid extravasation (odds ratio 3.22; 95% confidence interval 1.07-9.68). No statistically significant relationship was found in blood pressure, heart rate, temperature, oxygen saturation, end-tidal carbon dioxide, and pulmonary compliance between cases with and without IAFE. CONCLUSIONS: Asymptomatic IAFE, as measured by ultrasound, is a frequent event in patients who underwent hip arthroscopy, mainly in cases with DGS. PIP was found to be a useful intraoperative monitoring parameter for the early identification of IAFE in hip arthroscopy. LEVEL OF EVIDENCE: Level II, observational prospective cohort study.

Groin pain of neurological origin as a differential diagnosis of femoroacetabular impingement.

BACKGROUND: To describe the experience in the diagnostic process and treatment of patients with groin pain (GP) of neurological origin due to entrapment of the iliohypogastric (IH), ilioinguinal (IL) and genitofemoral (GF) nerves in a hip preservation clinic. METHODS: Retrospective study of patients with GP of neurological origin confirmed with ultrasound-guided nerve block. Clinical outcomes were reported in 21 cases (age, 53.3 ± 15.9 years) treated with conservative treatment from January to December 2019, and in 9 patients (age 43.7 ± 14.6 years) who underwent neurectomy from January 2015 to December 2019. Pain intensity was assessed with a numerical rating scale (NRS) before starting the diagnostic process (Day 0) and at the end of follow-up. RESULTS: All cases reported pain on groin palpation. Half of these cases also reported a positive FADIR test (flexion, adduction, internal rotation) (15/30). On day 0, the intensity of pain in cases treated with conservative treatment was severe in 19 patients (NRS 7-10) and moderate in 2 (NRS 4-6), with a median improvement of 7 points (interquartile range [IQR] 5.5-8.0) at the end of follow-up (p < 0.001). In neurectomy group, a similar improvement in pain severity was (Day 0: 9 points [IQR 8.0-9.0]; end of follow-up: 0 points [IQR: 0-2.0]; p = 0.002). At the end of the study, 17/21 patients with conservative treatment and 7/9 with neurectomy were pain free or with mild pain (NRS < 3). CONCLUSIONS: In cases with PG of neurological origin, there is a high frequency of false positives in the FADIR test. Our findings suggest that neurectomy is a treatment option for patients in whom conservative treatment fails, providing significant pain relief.

Intra-abdominal Fluid Extravasation: Is Endoscopic Deep Gluteal Space Exploration a Risk Factor?

BACKGROUND: The extravasation of fluid into the intra-abdominal space is recognized as a possible complication of hip arthroscopic surgery/endoscopy. The exposure of anatomic areas to elevated pump pressures and high volumes of irrigation fluid increases the risk of fluid leakage into anatomic spaces around the hip joint, especially to the abdomen and pelvis. PURPOSE: To estimate the incidence and risk factors related to intra-abdominal fluid extravasation (IAFE) after hip endoscopy or arthroscopic surgery. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: A prospective study was carried out between June 2017 and June 2018. A total of 106 hip procedures (endoscopy or arthroscopic surgery) performed for extra- or intra-articular abnormalities were included. Before and after surgery, in the operating room, ultrasound was performed by a trained anesthesiologist to detect IAFE. The hepatorenal (Morison pouch), splenorenal, retroaortic, suprapubic (longitudinal and transverse), and pleural spaces were examined. Patients were monitored for 3 hours after surgery to assess for abdominal pain. The data collected included maximum pump pressure, duration and volume of irrigation fluid (Ringer lactate), total surgical time, and traction time. RESULTS: The incidence of IAFE was 31.1% (33/106; 95% CI, 23.1%-40.5%). The frequency of IAFE was 52.9% (9/17) in cases with isolated extra-articular abnormalities and 15.9% (7/44) in cases with isolated femoroacetabular impingement; in cases with both extra- and intra-articular abnormalities, the frequency was 37.8% (17/45). An intervention in the subgluteal space was identified as a risk factor for IAFE (odds ratio, 3.62 [95% CI, 1.47-8.85]). There was no statistically significant difference between groups (with vs without IAFE) regarding total surgical time, maximum pump pressure, or fluid volume. Postoperative abdominal pain was found in 36.4% (n = 12) of cases with IAFE compared with 2.7% (n = 2) of cases without extravasation (P < .001). No patient with IAFE developed abdominal compartment syndrome. CONCLUSION: IAFE was a frequent finding after hip arthroscopic surgery/endoscopy in patients with extra-articular abnormalities. Exploration of the subgluteal space may increase the risk of IAFE. Pain and abdominal distension during the immediate postoperative period were early warning signs for IAFE. These results reinforce the need for careful intraoperative and postoperative monitoring by the surgeon and anesthesiologist to identify and avoid complications related to IAFE.