Abstract
A barbed suture is a self-anchoring knotless suture hypothesized to shorten suture time and reduce the tension point of the wound. The purpose of this study was to compare the barbed suture and the interrupted suture for fascial closure in total hip arthroplasty. We retrospectively reviewed patients who underwent total hip arthroplasty from March 2014 to June 2020. We evaluated 324 cases among 274 patients consisting of 188 males and 86 females. We collected the following data: demographics, time for wound closure, the number of threads used, hemoglobin level, surgical site pain, and wound complications. Variables were analyzed for their association with closure time using multiple regression analyses between the barbed suture (the SFX group) and the interrupted suture (the Vicryl group). Mean closure time was 5.8 min lower and the mean number of sutures used was 2.2 lower in the SFX group versus the Vicryl group (P < 0.01 and < 0.01, respectively). There were no statistical intergroup differences in the mean largest hemoglobin drop, the incidence of transfusion, surgical site pain, and the incidence of wound complications. The use of barbed sutures for fascial closure in total hip arthroplasty effectively reduces the surgical time without increasing wound complications.
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Introduction
Interrupted sutures have conventionally been used in fascial closure for total hip arthroplasty (THA). However, tying every knot is a time-consuming procedure, and the tightened knot may impair tissue healing by allowing tissue overlap and interfering with fibroblast proliferation. Bulky knots may be a nidus for infection, and they may extrude through skin weeks after surgery1. A barbed suture is a self-anchoring knotless suture and hypothesized to shorten suture time and reduce the tension point of the wound2. Since the firstly described by R.A. McKenzie in 19673, barbed suture became commercialized and has been used in the various medical field like general4,5,6,7,8,9, urological10,11, plastic12,13,14, and gynecological surgeries15,16,17,18,19.
In the field of orthopaedic surgery, several studies on barbed sutures in total knee arthroplasty have been published20,21,22,23,24,25,26,27,28,29,30,31. In most of these, barbed sutures reduced operation time, improved cost-effectiveness, and did not increase the rate of wound complications. However, there is a dearth of published data on the barbed suture technique for THA relative to that for total knee arthroplasty.
In particular, data are lacking on the outcomes of applying barbed sutures for fascial closure in THA. Papers have analyzed the application of barbed sutures to the subcutaneous and subcuticular layers in addition to the fascial layer20,30,32,33,34,35,36. However, few have only applied barbed sutures to the fascial layer alone, which makes it difficult to evaluate the suitability of barbed sutures for fascial closure. Inadequate fascial closure causes adverse wound reactions, such as hematoma and oozing, and increases the risk of deep infection, resulting in severe complications.
The purpose of this study was to compare the barbed suture and the interrupted suture for fascial closure in THA. The following factors were assessed in this retrospective analysis of prospectively collected data: (1) closure time; (2) number of threads used; (3) perioperative hemoglobin (Hb) level; (4) Visual Analogue Scale (VAS) for surgical site pain; and (5) complications related with a surgical wound.
Materials and methods
Ethical statements
The study was performed following approval from the institutional review board of Asan Medical Center (No. 2020–1531). Informed consent was waived by the institutional review board of Asan Medical Center and all methods were carried out in accordance with relevant guidelines.
Study population
We performed a retrospective study of prospectively collected data for patients aged 18 years and older who underwent primary THA. The study was performed in accordance with guidelines of institutional review board. The informed consent was waived. All patients were treated by a single surgeon at a single institution, Asan Medical Center, from March 2014 to June 2020. During the period, 997 cases of primary THA were performed at this institution. Among these, 565 cases which were diagnosed with osteonecrosis of the femoral head (ONFH) were included in this study. To minimize the factors affecting the surgical procedure time and wound complications, cases with the following conditions were excluded: (1) post-traumatic ONFH (31 cases); (2) THAs performed by an approach other than the posterolateral approach (8 cases); (3) prior surgery for ONFH (39 cases); (4) possible bleeding tendency, e.g., Child–Pugh class B, C, or taking anticoagulants (28 cases); (5) cable fixation during the surgery (16 cases); (6) no intra-operative radiograph (53 cases); and (7) skin closure with a staple (44 cases). Cases with follow-up loss before postoperative 3 months (19 cases), osteogenesis imperfecta (1 case), use of closed suction drainage (1 case), and stem exchange after real implant insertion (1 case) were also excluded. Finally, 324 cases of THA surgeries among 274 patients were evaluated, consisting of 188 males and 86 females with a mean age of 51.6 years (range, 18–84 years). Baseline demographic and medical history data were collected from the electronic medical record, and the Charlson Comorbidity Index (CCI)37 was calculated for each patient.
Surgical technique
All analyzed cases were diagnosed with ONFH and underwent THA via the posterolateral approach. Femoral procedures were done after the acetabular procedure including the insertion of a real acetabular cup and a liner. After serial rasping on the femoral side, an intraoperative radiograph of the pelvis was taken to evaluate the cup position and the size of the femoral component. Insertion of real femoral component, manual test for joint stability, irrigation, capsulotomy site repair, piriformis and short external rotator muscles repair, fascial repair, and suture for subcutaneous and skin layer was done serially. Closed suction drainage was not used in routine THA procedures.
Except for fascial closure, the closure process was performed by the same suture materials and techniques in all cases. Number #2 triclosan-coated glycolide-lactide absorbable suture (Vicryl Plus Antibacterial Suture, Ethicon; Johnson & Johnson, USA) was used to repair the capsulotomy site, piriformis muscle, and short external rotator muscles, and to close the subcutaneous layer. Number 2-0 violet braided polyglactin 910 absorbable suture (Vicryl Plus, Ethicon) was used for closing the subcuticular layer. For skin closure, adhesive mesh with glue (Prineo, Ethicon) was used.
For fascial closure, either the barbed continuous suture using number #1–0 polydioxanone suture (Stratafix Symmetric PDS Plus, Ethicon) or the interrupted suture using number #2 triclosan-coated glycolide-lactide absorbable suture (Vicryl Plus Antibacterial suture, Ethicon) was used. The interrupted suture was used before October 2018, whereas the barbed suture was used after October 2018 (Fig. 1).
Outcome measures
From the surgical record, the number of threads used and the closure type for fascia were addressed. Time for the start of anesthesia, skin incision, intraoperative radiograph, skin closure and exit from the operation room were also collected. Using these data, three different time intervals were calculated. “Closure time” was defined as the time from the intraoperative radiograph to the initiation of skin closure. In accordance with this definition, the closure time included insertion of real femoral component, irrigation, repair for capsule, muscle, and fascia, and closure for subcutaneous tissue. “Procedure duration” was defined as the time from the skin incision to the initiation of skin closure. “Total operation time” was defined as the time from the start of anesthesia to exit from the operation room (Fig. 1).
Patients were routinely discharged on the fifth day of the surgery, and routine visits were scheduled at postoperative six weeks and three months. Hb levels were checked before the surgery, on the first, third, fifth days, and six weeks after the surgery. The level of the largest Hb drop during the admission days was measured. Whether blood transfusion was performed during hospital days were also recorded. VAS for pain in the affected hip was assessed preoperatively and postoperatively, and improvement in VAS was calculated. Wound complications based on the criteria of Healy et al.38 were analyzed during the hospital stay and at the outpatient clinic. Readmission and reoperation were defined as any event related to THA that required readmission or reoperation.
Statistical analysis
Two-tailed Student t-tests or Mann–Whitney tests were used to evaluate continuous outcomes, with a 0.05 alpha-level for statistical significance, the latter which was used when normality could not be assumed. To assess dichotomous variables, the chi-square test was used unless cells with a frequency of five or less exceeded 20%, in which case Fisher’s exact test was performed. To adjust for six confounders (wound closure type, age, gender, smoking history, BMI, and CCI) that may be associated with closure time or wound complications, linear and logistic multiple regression analysis was conducted for continuous and dichotomous dependent variables, respectively. All analyses were conducted using R software (version 4.0.3).
Results
Of 324 cases, fascial closure was done with a barbed continuous suture in 126 cases (SFX group) and with an interrupted suture in 198 cases (Vicryl group). The mean age was 3.3 years younger in the SFX group (P = 0.04), and the proportion of current smokers was higher in the SFX group (30.2% versus 16.2% in the Vicryl group, P = 0.01). Other demographic factors such as gender, body mass index (BMI), diabetes mellitus, CCI, and preoperative use of iron medication showed no significant difference between the two groups (Table 1).
Forty-nine patients underwent staged total hip arthroplasties, whereas no simultaneous bilateral total hip arthroplasties were conducted in this study. There was no statistical difference between the two groups in the rate of patients who underwent staged total hip arthroplasties (8.7% in the SFX group and 14.6% in the Vicryl group, P = 0.11) (Table 1). No overall wound complications were observed in these patients.
The time for all three evaluated operating intervals for THA was statistically lower in the SFX group: mean closure time was lower by 5.8 min (P < 0.01), mean procedure duration by 8.1 min (P < 0.01), and mean total operation time by 8.1 min (P < 0.01). The mean number of #2 Vicryl sutures used for closure was 2.2 lower in the SFX group compared with the Vicryl group (P < 0.01) (Table 2).
Intergroup differences in the mean of the largest Hb drop during the hospitalization were not statistically significant (− 2.5 g/dl in the SFX group versus − 2.6 g/dl in the Vicryl group, P = 0.37). In the SFX group, the mean Hb level was 12.8 g/dl preoperatively and 13.5 g/dl at postoperative 6 weeks. These showed no statistical significance with those of Vicryl group, respectively; 13.1 g/dl preoperatively (P = 0.12), and 13.4 g/dl at postoperative 6 weeks (P = 0.60). The number of cases that had undergone blood transfusion during the admission days was 17 (13.5%) in the SFX group and 44 (22.2%) in the Vicryl group. There was no statistical difference between the two (P = 0.07). Improvement in VAS for hip pain also showed no statistically significant difference between the two groups (P = 0.07) (Table 3).
There were 4 cases with wound complications, 1 in the SFX group and 3 in the Vicryl group, with no statistical differences in complication rates between groups (P = 1.00). Brief patient information for each case was as follows: (1) A 31-year-old female patient in the SFX group showed oozing on the surgical site combined with stitch abscess at postoperative 6 weeks. Two times of debridement and wound revision was done. There was a substantial amount of liquified hematoma in the subcutaneous layer. Dehiscence of the fascial layer, though, was not observed during the two operations. Coagulase-negative staphylococcus was identified from the stitch abscess, but no bacteria were identified in the subcutaneous layer; (2) A 67-year-old female patient in the Vicryl group complained of wound dehiscence of the skin layer at 17 days from the index surgery. Wound revision was done at postoperative 18 days; (3) A 66-year-old male patient in the Vicryl group complained of discomfort at the surgical site. The area which was presumed to be a hematoma site was firmly palpated. Discomfort disappeared by conservative treatment; and (4) A 67-year-old female patient in the Vicryl group showed stitch abscess at postoperative 6 weeks. A minimal amount of fluid was naturally drained and the wound was healed without other complications. There were no findings suggesting deep surgical site infection or periprosthetic joint infection in the aforementioned cases (Table 4).
Multiple regression analysis showed wound closure type and BMI each had a statistically significant effect on closure time of the THA patients (P < 0.01 and P = 0.04, respectively). Cases with the barbed suture or low BMI required shorter closure time, although BMI was not statistically different between the two groups in this study. Closure type did not have a statistically significant effect on the occurrence of wound complications related to THA (P = 0.47) (Table 5).
Discussion
This study suggests that utilization of barbed suture materials can reduce surgical time and the number of threads used for THA. These results were observed without an increase in surgical site wound complications. These results are consistent with published studies on total knee arthroplasties20,21,22,23,24,25,26,27,28,29,30,31. The barbed suture technique applied only to the fascial layer in THA has little been studied except for one study39. Most prior studies addressed barbed sutures for both the fascia and subcutaneous layer20,30,32,33,34,35,36, subcutaneous layer only40, or subcuticular layer only41,42,43. Inconsistent application of the barbed sutures during wound closure creates difficulty in comparing the results of these studies. The meta-analysis on these studies20,44,45 also has limitations for the heterogeneity of the target studies.
Sundaram et al.39 published a randomized controlled trial for the method of suture technique in the fascial layer of 60 THA patients. The study showed, as in our study, a statistically significant reduction of closure time by 5 min for the barbed suture group, and no intergroup difference in wound complications. However, the study was limited by a relatively small sample size (30 patients per group), which is not ideal for evaluating rare operative complications. Our study indicated that the use of barbed sutures can improve the efficiency of THA by reducing the surgical time by 5–8 min with fewer threads than required for conventional methods. The most challenging issue in the medical market is always how to efficiently distribute limited medical resources. Given that time is a limited medical resource to be allocated, efficiency in performing THA is the value that we must increase. In this respect, the use of barbed sutures, which can reduce overall operation time, is a good option for THA surgery.
In addition to time savings, the number of threads used was 2.2 less in the SFX group than in the Vicryl group. Considering that the length of the Vicryl (Ethicon) suture is 70 cm and that of the Stratafix (Ethicon) is 45 cm, barbed sutures allow suture of the surgical wound with a shorter length of threads. This furthers the efficient allocation of medical resources.
Utilization of barbed sutures in THA does not appear to worsen the surgical outcome of THA. By a cadaveric experiment by Nett et al.46, a barbed continuous suture is more watertight than a conventional interrupted suture. Although watertightness was not evaluated in this study, there was no difference in Hb level drop, transfusion rate, or occurrence of operative site hematoma between the SFX and Vicryl groups. Of the observed wound complications in this study, only hematomas are associated with inadequate fascial closure. Hematoma occurred in one case each in both patient groups. Although a barbed suture is expected to reduce surgical infection1,2, deep infection, which can be caused by inadequate closure of the fascial layer, did not occur in either group in this study. Since the surgical site for THA was a clean surgical wound, deep infections were unlikely to occur unless an external source of infection was inoculated. This may be why deep infection was not observed in this study. Therefore, in our study the barbed suture enabled more efficient wound closure without increasing wound complications.
There are some limitations to this study, including those inherent to study design. First, all patients included in this study were Asians, given the location of the institution was South Korea. However, THA procedures is not expected to vary significantly by patients’ race. Second, the SFX group was on average 3.3 years younger and the proportion of smokers was about 2 times higher than the Vicryl group. The authors believe that the age difference of about 3 years does not bear clinical significance. Further, the statistically significant effect of closure type persisted after multiple regression analysis, which included age and smoking as possible confounders. Considering that the smoking adversely affects surgical wound healing, it should be noted when interpreting the result of this study that the smoking rate was about twice as high in the SFX group. Third, the exact time for fascial closure was not assessed, as it was not routinely recorded in this institution. However, the surgical procedure in this study was standardized as much as possible by including only ONFH patients who had undergone THA by the posterolateral approach and excluding cases with factors likely to affect operation time such as bleeding tendency, cable fixation, or prior surgery of the affected hip. The three different time intervals which was calculated in this study showed similar decreases in the SFX group. Through this, the fascial closure time can be indirectly estimated. Finally, although the use of barbed sutures in THA increases surgical efficiency, further research is needed to ascertain its cost effectiveness. The price of the thread used in the SFX group (Stratafix, Ethicon) was about 25 $ and that in the Vicryl group (Vicryl, Ethicon) was about 5 $ in South Korea. This study showed that the use of barbed sutures reduces the number of threads used by 2.2 on average; nonetheless, if price is the only consideration, the SFX group is at a disadvantage. Though, the value of sutures should be quantified in the context of all potential cost offsets, like time savings given that the time is the limited medical resources. Such calculations are challenging in the light of the complexity and variability of the medical system by institutions and countries.
Conclusions
This study suggests that the use of barbed sutures for fascial closure in THA effectively reduces the surgical time as well as the number of threads without increasing the wound complications.
Data availability
The data analyzed during the current study are not publicly available due to the policy of the institutional review board of Asan Medical Center but are available from the corresponding author on reasonable request.
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This study was funded by Ethicon; Johnson & Johnson, USA.
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All authors contributed to the study conception and design. Data acquisition and analysis were performed by S.L., T.K., and M.Y.J. The first draft of the manuscript was written by S.L., and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Author Pil Whan Yoon has received fund for this study from Ethicon. Otherwise, there is no conflict interest of the other authors.
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Lee, S., Kee, T., Jung, M.Y. et al. A comparison of barbed continuous suture versus conventional interrupted suture for fascial closure in total hip arthroplasty. Sci Rep 12, 3942 (2022). https://doi.org/10.1038/s41598-022-07862-5
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DOI: https://doi.org/10.1038/s41598-022-07862-5
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