A Comparison of the Incidences of Venous Thromboembolism after Total Hip Arthroplasty between the Direct Anterior Approach and the Direct Lateral Approach, Especially in the Early Period after Introduction of the Direct Anterior Approach

Kawano, Tetsuya; Kijima, Hiroaki; Yamada, Shin; Konishi, Natsuo; Kubota, Hitoshi; Tazawa, Hiroshi; Tani, Takayuki; Suzuki, Norio; Kamo, Keiji; Okudera, Yoshihiko; Fujii, Masashi; Sasaki, Ken; Iwamoto, Yosuke; Nagahata, Itsuki; Miura, Takanori; Miyakoshi, Naohisa; Shimada, Yoichi

doi:https://doi.org/10.1155/2020/4649207

Advances in Orthopedics

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Abstract Introduction Materials and Methods Results Discussion Data Availability Conflicts of Interest References Copyright Related Articles

Research Article | Open Access

Volume 2020 | Article ID 4649207 | https://doi.org/10.1155/2020/4649207

A Comparison of the Incidences of Venous Thromboembolism after Total Hip Arthroplasty between the Direct Anterior Approach and the Direct Lateral Approach, Especially in the Early Period after Introduction of the Direct Anterior Approach

Tetsuya Kawano,^1,2Hiroaki Kijima,^1,2Shin Yamada,²Natsuo Konishi,²Hitoshi Kubota,²Hiroshi Tazawa,²Takayuki Tani,²Norio Suzuki,²Keiji Kamo,²Yoshihiko Okudera,²Masashi Fujii,^1,2and Ken Sasaki² et al.

Academic Editor: Benjamin Blondel

Received04 Mar 2020

Revised28 Apr 2020

Accepted14 May 2020

Published04 Jun 2020

Abstract

Objective. To compare the incidence of venous thromboembolism (VTE) after total hip arthroplasty (THA) using the direct anterior approach (DAA) with that using the direct lateral approach (DLA). In addition, patient background characteristics and the incidence of VTE were compared between the first half and the latter half of the period after introducing DAA and against DLA. Method. This was a retrospective, multicenter study involving 109 patients (116 hips) who had undergone primary unilateral THA. Thirty-six hips underwent THA using DAA and 80 hips underwent THA using DLA. Patient information including sex, age, and preoperative diagnosis was collected. The incidence of VTE was compared between DAA and DLA. Moreover, the patients who underwent THA using DAA were divided into 2 groups (first half and latter half groups), and sex, age, body mass index (BMI), and surgical time were compared between the 2 groups. Moreover, the incidence of VTE was compared among the 3 groups (first half of DAA, latter half of DAA, and DLA). Results. The incidence of VTE in the DAA group was significantly higher than that in the DLA group . The incidence of VTE in the first half group was significantly higher than in the latter half group and the DLA group ( and , respectively), and there was no difference in the incidence of VTE between the latter half group and the DLA group . Surgical time was significantly longer in the first half group than in the latter half group . Conclusions. In the first half of the period after introducing the DAA, more VTEs occurred than in the DLA. It may be important to shorten the surgical time in the early stage of introducing the DAA, and aggressive anticoagulation therapy may be required until the surgeon becomes familiar with the procedure.

1. Introduction

Venous thromboembolism (VTE) is a generic term for pulmonary embolism (PE) and deep venous thrombosis (DVT), and it is a serious complication that can occur after total hip arthroplasty (THA). Because the mortality rate of symptomatic PE is high, the prevention of VTE is very important. This includes anticoagulation therapy and physical prevention; however, when anticoagulation therapy is given to the patients with a risk of hemorrhage, aged patients, and those with impaired renal function, attention must be paid to the occurrence of hemorrhagic complications [1]. On the other hand, physical methods of prevention, such as early postoperative mobilization, have a low cost and a low risk of complications. Therefore, the American Academy of Orthopaedic Surgeons (AAOS) guidelines recommended physical prevention for preventing VTE [2].

There are several approaches to THA. The direct anterior approach (DAA) uses a natural intramuscular and intranerve interval [3]. This approach can lead to more rapid recovery after surgery because it is less invasive. From August 2015, we changed the standard approach for THA from a direct lateral approach (DLA), including the Dall and Hardinge approach, to DAA. However, we had many cases of VTE immediately after introduction of DAA, in contrary to our expectations. Thus, the aim of this study was to compare the incidence of VTE after THA using DAA with that using DLA. In addition, the incidence of VTE in two time periods after introducing the DAA was investigated.

2. Materials and Methods

This was a retrospective, multicenter study. Patients were recruited from January 2014 to November 2017. Of these cases, patients who underwent bilateral THAs on the same day, underwent revision THA, underwent THA after osteotomy, or underwent THA due to fracture were excluded. A total of 109 patients (116 hips) who had undergone primary unilateral THA were included. One surgeon performed THA using DAA (36 hips), and 3 experienced surgeons performed THA using DLA (Dall approach, 62 hips; Hardinge approach, 18 hips). THAs using DAA and DLA were performed with the patient placed in the supine position and in the lateral decubitus position, respectively, on a regular table under general anesthesia. All THAs were performed with cementless stems and cups. All patients undergoing both DAA and Hardinge approaches could leave their beds and were permitted full weight-bearing after drain removal. Patients who underwent THAs using the Dall approach required restricted weight-bearing for 3 weeks to avoid detaching the greater trochanter. Patient information including sex, age, and preoperative diagnosis was collected. The incidence of VTE was compared between DAA and DLA. The patients who underwent THA using DAA were divided into 2 groups (first half and latter half of the period after introduction of DAA), and sex, age, body mass index (BMI), and surgical time were compared between the 2 groups. Additionally, the incidence of VTE was compared among 3 groups: the first half and latter half of DAA, and DLA. Enhanced computed tomography (CT) or lower extremity ultrasound (US) was performed to investigate for VTE at 2 weeks after THA. The sensitivity and specificity of enhanced CT for VTE were reported to be 89–100% and 94–100%, respectively [4–6]. The sensitivity and specificity of lower extremity US for VTE were reported to be 90.1–94% and 98.5–97.3%, respectively [7].

Manual calf massage was performed to maintain venous circulation and increase the blood flow velocity and muscular pumping of the calf by passive ankle motion after THA for VTE prevention according to the method reported by Funayama et al. and Imai et al. [8, 9].

2.1. Statistical Analysis

Comparisons between groups were performed using the Mann–Whitney U test. Proportions were analyzed using the chi-squared test. All statistical analyses were performed using Statistical Package for the Biosciences software (SPBS version 9.68) [10]. This study was performed with the approval of our institutional ethics committee. The patients and/or their families were informed that their data would be submitted for publication, and they gave their consent.

3. Results

Preoperative diagnoses in the DAA group were osteoarthritis (OA; 29 hips), rapid destructive coxarthropathy (RDC; 5 hips), and idiopathic osteonecrosis of the femoral head (ION; 2 hips). Preoperative diagnoses in the DLA group were OA (74 hips), RDC (1 hips), ION (4 hips), and rheumatoid arthritis (RA; 1 hip). The DAA group had a significantly higher percentage of female patients . The incidence of VTE was significantly higher in the DAA group . The mean surgical time was significantly longer in the DLA group (Table 1).

There was no significant difference in the sex, age, and BMI between the first half and latter half groups. Surgical time was significantly longer in the first half group than in the latter half group (Table 2). The incidence of VTE in the first half group was higher than in the latter half group and the DLA group ( and , respectively). However, there was no difference in the incidence of VTE between the latter half group and the DLA group .

4. Discussion

This study compared the incidence of VTE after THA using DAA and using DLA. The incidence of VTE after THA was significantly higher after DAA than after DLA. In particular, the incidence of VTE was higher during the first half of the period following introduction of DAA.

The cause of VTE has been described as Virchow’s triad: venous stasis, endothelial insult, and hypercoagulability. The surgical approach was one of the causes of venous stasis and endothelial insult. In both posterior and lateral approaches, the combination of femoral flexion, adduction, and internal rotation required for canal preparation causes obstruction of the femoral vein in both the posterior and lateral approaches [11]. On the other hand, the combination of femoral extension, adduction, and external rotation required for canal preparation in the DAA does not cause femoral vein obstruction [12–14]. Therefore, the position for canal preparation during THA using DAA may not be the cause of VTE. However, in the present study, the prevalence of VTE was higher in the DAA group, especially during the first half of the period after introduction of DAA, than in the DLA group. A previous study reported that the femoral venous cross-sectional area and peak flow were significantly decreased in the acetabulum preparation position with a retractor over the anterior wall during acetabular preparation, compared with preincision during THA using DAA [15]. Several studies showed that, because there were leaning curves for THA using the DAA, surgeons who introduced DAA have an increased risk of complications and worse outcomes [16–18]. Considering that VTE cases were concentrated in the first half of the period after DAA introduction and that the surgical time of the first half group was also significantly longer in the present study, VTE was likely to occur due to the longer time of femoral vein occlusion by the retractors. Therefore, the operator should relax retractors when not actively working on acetabular preparation.

To the best of our knowledge, this is the first report to show the possibility of VTE occurrence after THA using DAA, especially in the early period after introducing the DAA. In particular, the present study is a valuable report that shows shortening the preparation time of the acetabulum with retractors can lead to VTE prevention. Therefore, surgeons should become able to prepare the acetabulum in a shorter time using retractors while gaining experience. However, this study had several limitations. First, we did not investigate the degree of hip dysplasia such as “Crowe classification” which may affect the surgical indication of DAA [19]. Second, femoral venous cross-sectional area could not be measured during the operation with ultrasound. Evaluation of blood flow using ultrasound was a useful method; however, it was difficult from the perspective of preventing infection during surgery. Third, the time using a retractor was not measured. Thus, we have to next evaluate the risk of VTE occurrence due to using a retractor by precisely measuring the retractor time and determining the VTE occurrence rate. Fourth, the interobserver and intraobserver agreements of the diagnosis by enhanced CT or lower extremity US were not investigated.

In conclusion, a larger number of VTEs occurred after THA using DAA, especially in the early period than using the DLA. It may be important to shorten the time of using retractors during THA through DAA. In addition, careful monitoring for VTE after surgery and aggressive anticoagulation therapy may be required in the early stage of introducing the DAA until the surgeon becomes familiar with the procedure.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright

Copyright © 2020 Tetsuya Kawano et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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