One-shot dilation versus metallic dilation technique for access in percutaneous nephrolithotomy: comparison of efficacy, access time and fluoroscopic time

Objective: The aim of this study was to compare the efficacy, access tract dilation time and fluoroscopic time between the one-shot dilation technique and telescopic metal dilatation technique in patients undergoing percutaneous nephrolithotomy in Nakornping Hospital. Materials and Methods: Sixty-six patients who underwent percutaneous nephrolithotomy from January 2020 to July 2021 were included in the study and they were randomly divided into two groups. In group 1 (32 patients), telescopic metal dilation was used, in group 2 (33 patients), the one-shot technique was used. Success rates of dilation, access tract dilation time and fluoroscopic time were evaluated. Results: The success rate of dilation was 100% in both groups. The access tract dilation time was 835.63 ± 309.68 seconds in group 1 and 569.42 ± 314.75 seconds in group 2 (p = 0.001). The fluoroscopic time was 48.16 ± 22.16 seconds in group 1 and 41.97 ± 23.99 seconds in group 2 (p = 0.29). The access tract dilation time of the one-shot dilation technique was statistically significantly shorter than that in the telescopic metal dilatation group. The mean fluoroscopic time of the one- shot dilation technique was shorter than in telescopic metal dilatation but was not statistically significant. Conclusion: One-shot dilation technique is as effective as telescopic metal dilatation, with a significant reduction in access tract dilation time.

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Comparison of the results of percutaneous nephrolithotomy in different age groups

International Surgery Journal ◽

10.18203/2349-2902.isj20185013 ◽

2018 ◽

Vol 5 (12) ◽

pp. 3888

Author(s):

Ali Borekoglu ◽

Ibrahim Atilla Aridogan ◽

Mutlu Deger ◽

Onur Karsli ◽

Volkan Izol

Keyword(s):

Blood Transfusion ◽

Percutaneous Nephrolithotomy ◽

Preoperative Evaluation ◽

Control Group ◽

Perioperative Bleeding ◽

Significant Difference ◽

The Mean ◽

Group 2 ◽

And Control ◽

Group 1

Background: Evaluation of feasibility, safety and effectiveness of percutaneous nephrolithotomy (PCNL) in different age groups.Methods: Between July 1997-October 2012, 233 patients who were 65 years old and older were included in this study. These patients were divided into two age subgroups used in gerontology research. Group 1 was defined as patients 65-74 years old, Group 2 was older than 74 years old. Data from patient records, including demographic characteristics, preoperative evaluation, operative details, and complications were retrospectively analyzed and compared with control group data.Results: The mean age of 233 patients was 69.7±4.6 years. The mean operative times for Group 1, group 2 and the control group were 76.2±47.3mins, 92.9±47.6mins, 77±44mins, respectively and there was no statistically significant difference between groups 1 and 2 and the control group (p>0.05). Twenty-eight of the 233 patients (12%) needed blood transfusion due to perioperative bleeding. The transfusion rates of groups 1 and 2 were 11.3% and 16.7%, respectively. There was no statistically significant difference between the study groups and control group for blood transfusion rates (p>0.05). There was no statistically significant difference in complications between the study and control groups (p>0.05).Conclusions: In geriatric patients, stone-free rates, transfusion rates and other operation parameters are similar to younger populations when experienced surgeons perform PCNL. Despite comorbidities and decreased body reserve, PCNL can be performed without a significant increase in complications in different ages.

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The Results of Trabeculectomy with Antimetabolites in Elderly Patients: A Retrospective Study

Acta Medica ◽

10.32552/2021.actamedica.582 ◽

2021 ◽

pp. 1-5

Author(s):

Özlem Dikmetaş ◽

Sepideh Lotfisadigh, ◽

Merve Kaşıkçı ◽

Ali Bülent Çankaya ◽

Sibel Kocabeyoğlu

Keyword(s):

Intraocular Pressure ◽

Retrospective Study ◽

Elderly Patients ◽

Mitomycin C ◽

Open Angle Glaucoma ◽

Success Rates ◽

Topical Medication ◽

The Mean ◽

Group 2 ◽

Group 1

Objective: To examine the effectiveness and results of primary trabeculectomy with 5-fluorouracil (group 1) or mitomycin-C (group 2) in elderly patients. Materials and Methods: This was a retrospective study including 67 eyes with primary open-angle glaucoma that underwent primary trabeculectomy with group 1 or group 2. Patients who were followed up for less than 1 year or were under 55 years of age were excluded from the study. Surgical success was evaluated according to a decrease in cup/disk ratio and reduction of intraocular pressure without any topical medication. Results: The mean ages of participants were 65.7 years (range 59–88) and 65.9 years (range 59–74) in groups 1 and 2, respectively. The mean preoperative and postoperative intraocular pressure values were 31.3 ± 5.7 mmHg (range 17–46) and 14.8 ± 0.4 mmHg (range 10–21) in group 1 (p < 0.001) and 31.5 ± 7.4 mmHg (range 18–52) and 14.8 ± 2.9 mmHg (range 10–21) in group 2 (p < 0.001). Conclusion: The use of 5-fluorouracil or mitomycin-C during primary trabeculectomy is associated with high postoperative success rates. There were no significant differences between 5-fluorouracil and mitomycin-C in terms of intraocular pressure reduction.

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Modified Kocher-Langenbeck Approach for the Treatment of Posterior Wall or Column Acetabular Fractures: The One-Incision Two-Window Method

10.21203/rs.3.rs-58691/v1 ◽

2020 ◽

Author(s):

Tien-Yu Yang ◽

Po-Yao Chuang ◽

Tsan-Wen Huang ◽

Kuo-Chin Huang

Keyword(s):

Posterior Wall ◽

Acetabular Fractures ◽

Fracture Group ◽

Satisfaction Rate ◽

Posterior Wall Fracture ◽

The Mean ◽

Group 2 ◽

The One ◽

Group 1

Abstract Background: The Kocher-Langenbeck (K-L) approach is the standard method for the treatment of posterior wall or column acetabular fractures. This approach allows direct access to the posterior structures of the acetabulum, but is limited cranially and caudally by the neurovascular bundle. The present study was conducted to assess the quality of reduction and the incidence of complications in patients who underwent the modified “one-incision two-window” K-L approach.Methods : This is a Retrospective case series with recruited thirteen consecutive patients from 2015 to 2017 who sustained an acute, displaced posterior wall or column acetabular fracture. All patients were treated with modified “one-incision two-window” K-L approach.Results: The mean operation time, mean intraoperative blood loss, and mean incision wound length were estimated to be 103.8 min (60-120 min), 373.1 mL (100-700 mL), and 9.7 cm (8.0-13.0 cm), respectively. The radiographic quality of reduction was graded as anatomical reduction (maximum residual displacement [MRD] ≤ 2 mm) in all cases, according to Matta’s criteria. Concerning the incidence of complications, there were no iatrogenic neurovascular injury, no surgical site infections, and no osteonecrosis of the femoral head or heterotopic ossification in this cohort. One patient with transverse posterior wall fracture (group 1) experienced deep vein thrombosis in the lesion leg. Another two patients with solitary posterior wall fracture (group 2) developed posttraumatic osteoarthritis, with one diagnosed as Tonnis grade I lesion and the other as Tonnis grade III lesion. With respect to the clinical treatment outcome, the mean visual analogue scale (VAS), mean modified Harris Hip Score (mHHS) and subjective satisfaction rate were 1.7 (1.0-2.0), 90.6 (81-100), and 84.6% (80%-90%), respectively. Although there was no significant difference in the satisfaction rate (82.9% vs. 87.0%, P = 0.941) at 12 months after surgery, group 1 patients had more increased VAS score (2.0 vs. 1.2, P = 0.016) and more decreased mHHS (87.7 vs. 94.6, P = 0.014) than group 2 patients. Conclusions: Our pilot study confirmed that the “one-incision two-window” K-L approach is a simple, safe, reliable, and effective way to manage acute, displaced posterior wall or column acetabular fractures.Level of evidence: Therapeutic study, level IV.

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Ab Interno vs. Ab Externo Microcatheter-Assisted Circumferential Trabeculotomy in Treating Patients With Primary Open-Angle Glaucoma

Frontiers in Medicine ◽

10.3389/fmed.2021.795172 ◽

2021 ◽

Vol 8 ◽

Author(s):

Weijia Zhang ◽

Yiwei Wang ◽

Chen Xin ◽

Yang Sun ◽

Kai Cao ◽

...

Keyword(s):

Primary Open Angle Glaucoma ◽

Open Angle Glaucoma ◽

Case Series ◽

Open Angle ◽

Success Rates ◽

Criterion A ◽

The Mean ◽

Group 2 ◽

Ab Interno ◽

Group 1

Background: Circumferential trabeculotomy have evolved from ab externo to ab interno approach. Both procedures may lower IOP, but it is unclear which maybe a superior approach.Purpose: To compare the outcomes of ab interno and ab externo circumferential trabeculotomy in patients with primary open-angle glaucoma.Design: Retrospective, comparative case series.Participants: Primary open angle glaucoma patients undergoing ab interno (40 patients in Group 1) or ab externo (54 patients in Group 2) circumferential trabeculotomy, with about one half of them having prior incisional glaucoma surgery.Methods: Outcomes including intraocular pressure (IOP), glaucoma medications and surgical complications were analyzed.Main Outcome Measures: IOP, medications and surgical success defined as an IOP of ≤ 21 mmHg and a reduction of IOP ≥20% from baseline (criterion A) or IOP ≤ 18 mmHg and a reduction of IOP 20% from baseline (criterion B) with (qualified success) or without (complete success) medications.Results: At 1 year, IOP decreased by 37.1% (26.0–14.8 mmHg) in Group 1 and 39.5% (28.5–15.1 mmHg) in Group 2. Medications decreased from 3.5 in Group 1 and 3.6 in Group 2 pre-operatively to 0.6 ± 1.0 and 0.3 ± 0.6 post-operatively, respectively. Success rates did not differ significantly between groups based on criterion A (complete and qualified success: 68.7 and 81.9% in Group 1, and 75.3 and 90.4% in Group 2, respectively) or criterion B (complete and qualified success: 58.2 and 79.3%in Group 1, and 69.5 and 88.4% in Group 2, respectively). For eyes with prior filtration surgeries, the mean percent reduction of IOP (41.7 ± 32.7% in Group 1, 39.7 ± 27.8% in Group 2, P = 0.724) and the mean medication reduction (2.9 ± 1.6 in Group 1, 3.4 ± 1.0 in Group 2, P = 0.454) were not significantly different.Conclusions: Ab interno circumferential trabeculotomy achieved comparable outcomes to ab externo trabeculotomy and may be an effective surgical option for patients with primary open-angle glaucoma.

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Effect of Renal Function on Success and Complications of Percutaneous Nephrolithotomy

Yeni Üroloji Dergisi ◽

10.33719/yud.2021;16-1-748024 ◽

2021 ◽

pp. 68-73

Author(s):

Serkan Yarimoglu ◽

Mehmet Erhan Aydin ◽

Murat Sahan ◽

Omer Koras ◽

Onur Erdemoglu ◽

...

Keyword(s):

Renal Function ◽

Glomerular Filtration ◽

Percutaneous Nephrolithotomy ◽

Kidney Stones ◽

Complication Rates ◽

Number Of Patients ◽

Group 3 ◽

The Mean ◽

Group 2 ◽

Group 1

Objective: In this study, we aimed to compare the success and complication rates of percutaneous nephrolithotomy (PCNL) according to preoperative glomerular filtration rates (GFR) of patients who underwent PCNLdue to kidney stones. Material and Methods: Between January 2012 and December 2016, 794 patients who underwent PCNL due to kidney Stones were evaluated retrospectively. Preoperative GFR values of patients were calculated according to Cockcroft –Gault formula. The patients with preoperative GFR values>90 ml/min, 60-90 ml/min, 30-60 ml/min were respectively defined as group-1, group-2 and group-3. Preoperative and perioperative values, Stone free rates and complication rates were compared between the groups. Postoperatively , <4 mm residual stone was identified as success. Results: There were 466 patients in Group-1, 259 in Group-2 and 67 patients in Group-3. The mean preoperative GFR values of the patients were 118.53 ml/min, 77.76 ml/min and 48.52 ml/min, respectively in group-1, group-2 and group-3 (p <0.001).The mean age of the patients was 62.8±11.47, 51.86±11.10, and60.31±12.7, respectively, in group-1, group-2 and group-3 (p<0.001).The mean Stone burden of the patients were 497.34±518.60 mm2, 517.6±493.8 mm2and 711.06±679.07 mm2, respectively, in group-1, group-2 and group-3 (p=0.013). The number of patients identified with success after surgery was 355 (86.2%), 195 (76.1%) and 50 (74.6%) in group-1, group-2 and group-3, respectively (p = 0.542). The number of patients who develop complications was 114 (%24.65), 57 (%22) and 11 (%16.4) in group-1, group-2 and group-3, respectively (p=0.310). Conclusion: Preoperative GFR valuesare not lonely sufficient to predict success and complications after PCNL. Keywords: Percutaneous nephrolithotomy, renal function, renal stone, glomerular filtration rates

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Comparative Study of Percutaneous Nephrolithotomy in Supine and Prone Positions

Journal of Nepal Health Research Council ◽

10.33314/jnhrc.v19i1.3346 ◽

2021 ◽

Vol 19 (1) ◽

pp. 154-157

Author(s):

Anup Chapagain ◽

Robin Bahadur Basnet ◽

Chitaranjan Shah ◽

Arvind Kumar Shah ◽

Parash Mani Shrestha ◽

...

Keyword(s):

Radiation Dose ◽

Prone Position ◽

Percutaneous Nephrolithotomy ◽

Supine Position ◽

Operative Duration ◽

Stone Free Rate ◽

The Mean ◽

Group 2 ◽

Free Rate ◽

Group 1

Background: The aim of the study is the compare efficacy and safety of percutaneous nephrolithotomy in supine and prone positions. Percutaneous nephrolithotomy is conventionally performed in prone position but in recent years numbers of supine percutaneous nephrolithotomies is increasing globally.Methods: The hospital based cross-sectional observational study was conducted in the Department of Urology, Bir Hospital from July 2018 to January 2020. A total of 81 consecutive patients undergoing percutaneous nephrolithotomy were divided into two groups, with 38 patients in Supine (Group 1) and 43 patients in Prone (Group 2) positions, respectively. Patient’s demographics, access time, operative duration, stone free rate, radiation dose and duration, irrigation fluid volume, post-operative hemoglobin drop and complications were compared.Results: Demographic and stone characteristics were comparable in both groups. Supine Group (Group 1) had significantly shorter operative duration than Prone Group (Group 2), 44.63 ± 12.44minsvs 53.02 ±12.67mins (p< 0.04). The mean radiation duration was 99.11 ± 61.17secs in Group 1 and 108.40 ± 51.65 secs in Group 2 (p=0.46), respectively. Although the mean radiation dose was lower in Group 1 (375.1µGym2) than in Group 2 (465.7 µGym2), it was not statistically significant(p=0.24). The stone free rate at 1 month duration were comparable with 92.1% and 93.02% in Group 1 and Group 2 respectively (p=0.16). Overall complication rates were similar in both groups (15.7% in Group 1 vs 16.2% in Group 2), respectively. None of the patients in both groups had complications higher than Clavien IIIa.Conclusions: PCNL in supine position has significantly shorter operative time with similar complications and stone free rates as compared to prone position.Keywords: percutaneous nephrolithotomy; prone position; supine position

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Simultaneous Bilateral Same-Day Endoscopic Myringoplasty Using Tragal Cartilage From One Ear

Ear Nose & Throat Journal ◽

10.1177/0145561319854065 ◽

2019 ◽

Vol 99 (8) ◽

pp. 522-527 ◽

Cited By ~ 1

Author(s):

Baklaci Deniz ◽

Kuzucu Ihsan ◽

Guler Ismail ◽

Kum Rauf Oguzhan ◽

Ozcan Muge

Keyword(s):

Chronic Otitis Media ◽

Operation Time ◽

Entire Group ◽

Success Rates ◽

Endoscopic Myringoplasty ◽

The Mean ◽

The Difference ◽

Group 2 ◽

Graft Success ◽

Group 1

The aim of this study is to investigate the outcomes of bilateral same-day endoscopic myringoplasty using tragal cartilage from one ear in patients with bilateral chronic otitis media. In this retrospective study, medical records of 62 (84 ears) patients aged between 18 and 65 years who underwent endoscopic myringoplasty at our center between January 2015 and December 2017 were evaluated. Patients were classified into 2 groups according to surgical procedure they received: unilateral myringoplasty (group 1) and bilateral same-day myringoplasty (group 2). The comparisons were made between groups in terms of anatomical graft success and functional outcomes. There were 40 patients in the unilateral group (group 1) and 22 patients in the bilateral same-day group (group 2). The graft success rates were 92.5% and 93.2% for groups 1 and 2, respectively ( P = .904). The mean preoperative air–bone gaps (ABGs) were 21.1 ± 7.1 and 20.5 ± 6.7 dB, respectively, whereas the mean postoperative ABGs were 8.1 ± 2.7 dB and 7.9 ± 3.0 dB, respectively. The difference between pre- and postoperative ABGs for the entire group was statistically significant ( P < .001). Mean hearing gain was 12.5 ± 11.0 dB and 15.6 ± 10.1 dB in groups 1 and 2, respectively, ( P = .183). Postoperative ABG was ≤10 dB in 33 (82.5%) and 36 (81.8%) ears in groups 1 and 2, respectively. The functional success rates were similar in both groups ( P = .582). The average lengths of operation time were 61.6 ± 12.5 minutes and 110.1 ± 25.2 minutes for groups 1 and 2, respectively. Bilateral same-day endoscopic myringoplasty using tragal cartilage from one ear seems to be a safe and satisfactory procedure with a good satisfactory success rate.

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Is nephrostomy tube a rule following all Percutaneous Nephrolithotomy (PCNL)? A prospective randomized study

Journal of Society of Surgeons of Nepal ◽

10.3126/jssn.v20i2.24380 ◽

2017 ◽

Vol 20 (2) ◽

pp. 43-48

Author(s):

Pawan Raj Chalise ◽

Bhojraj Luitel ◽

Suman Chapagain ◽

Sujeet Poudyal ◽

Prem Raj Gyawali ◽

...

Keyword(s):

Percutaneous Nephrolithotomy ◽

Randomized Study ◽

Operation Time ◽

Nephrostomy Tube ◽

Analgesic Requirement ◽

Postoperative Fever ◽

The Mean ◽

Group 2 ◽

Tubeless Pcnl ◽

Group 1

Introduction: Exit strategy at the end of percutaneous nephrolithotomy (PCNL) differs from center to center and patient to patient. Standard PCNL has been practiced so far with minor postoperative morbidities. Tubeless PCNL, which obviates most of the nephrostomy related morbidities, has been challenged for its safety. So this study was conducted to compare the safety and morbidity of tubeless PCNL with standard PCNL. Methods: Patients who had undergone PCNL, were randomized into group 1 (standard) and group 2 (tubeless) using computer generated random table. In group 1, nephrostomy tube was placed at the end of the procedure and tubes were omitted in group 2 patients. All preoperative, intraoperative and postoperative parameters were recorded and compared in between the groups. Results: Ninety six PCNLs were randomized into group 1 (47 patients) and group 2 (49 patients). Patients’ characteristics including age, sex, comorbidities, preoperative parameters, size and number of stones and mean operation time were comparable in between the groups. The incidence of postoperative fever, pain and analgesic requirement and urinary leak were found more in group 1 patients. The incidence of postoperative complications and events were comparable in both the groups except for blood transfusion. The mean length of postoperative hospital stay for patients in group 2 was significantly low as compared to group 1. Conclusion: Tubeless PCNL is safe and has less morbidity as compared to standard PCNL in selected cases.

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Modified Kocher-Langenbeck approach for the treatment of posterior wall or column acetabular fractures: The one-incision two-window method

10.21203/rs.3.rs-58691/v2 ◽

2020 ◽

Author(s):

Tien-Yu Yang ◽

Kuo-Chin Huang

Keyword(s):

Posterior Wall ◽

Acetabular Fractures ◽

Fracture Group ◽

Satisfaction Rate ◽

Posterior Wall Fracture ◽

The Mean ◽

Group 2 ◽

The One ◽

Group 1

Abstract Abstract The Kocher-Langenbeck (K-L) approach is the standard method for the treatment of posterior wall or column acetabular fractures. This approach allows direct access to the posterior structures of the acetabulum, but is limited cranially and caudally by the neurovascular bundle. The present study was conducted to assess the quality of reduction and the incidence of complications in patients who underwent the modified “one-incision two-window” K-L approach. Methods : This is a Retrospective case series with recruited thirteen consecutive patients from 2015 to 2017 who sustained an acute, displaced posterior wall or column acetabular fracture. All patients were treated with modified “one-incision two-window” K-L approach. Results: The mean operation time, mean intraoperative blood loss, and mean incision wound length were estimated to be 103.8 min (60-120 min), 373.1 mL (100-700 mL), and 9.7 cm (8.0-13.0 cm), respectively. The radiographic quality of reduction was graded as anatomical reduction (maximum residual displacement [MRD] ≤ 2 mm) in all cases, according to Matta’s criteria. Concerning the incidence of complications, there were no iatrogenic neurovascular injury, no surgical site infections, and no osteonecrosis of the femoral head or heterotopic ossification in this cohort. One patient with transverse posterior wall fracture (group 1) experienced deep vein thrombosis in the lesion leg. Another two patients with solitary posterior wall fracture (group 2) developed posttraumatic osteoarthritis, with one diagnosed as Tonnis grade I lesion and the other as Tonnis grade III lesion. With respect to the clinical treatment outcome, the mean visual analogue scale (VAS), mean modified Harris Hip Score (mHHS) and subjective satisfaction rate were 1.7 (1.0-2.0), 90.6 (81-100), and 84.6% (80%-90%), respectively. Although there was no significant difference in the satisfaction rate (82.9% vs. 87.0%, P = 0.941) at 12 months after surgery, group 1 patients had more increased VAS score (2.0 vs. 1.2, P = 0.016) and more decreased mHHS (87.7 vs. 94.6, P = 0.014) than group 2 patients. Conclusions: Our pilot study confirmed that the “one-incision two-window” K-L approach is a simple, safe, reliable, and effective way to manage acute, displaced posterior wall or column acetabular fractures.

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Modified Kocher-Langenbeck approach for the treatment of posterior wall or column acetabular fractures: The one-incision two-window method

10.21203/rs.3.rs-58691/v3 ◽

2020 ◽

Author(s):

Tien-Yu Yang ◽

Kuo-Chin Huang

Keyword(s):

Posterior Wall ◽

Acetabular Fractures ◽

Fracture Group ◽

Satisfaction Rate ◽

Posterior Wall Fracture ◽

The Mean ◽

Group 2 ◽

The One ◽

Group 1

Abstract Abstract The Kocher-Langenbeck (K-L) approach is the standard method for the treatment of posterior wall or column acetabular fractures. This approach allows direct access to the posterior structures of the acetabulum, but is limited cranially and caudally by the neurovascular bundle. The present study was conducted to assess the quality of reduction and the incidence of complications in patients who underwent the modified “one-incision two-window” K-L approach. Methods : This is a Retrospective case series with recruited thirteen consecutive patients from 2015 to 2017 who sustained an acute, displaced posterior wall or column acetabular fracture. All patients were treated with modified “one-incision two-window” K-L approach. Results: The mean operation time, mean intraoperative blood loss, and mean incision wound length were estimated to be 103.8 min (60-120 min), 373.1 mL (100-700 mL), and 9.7 cm (8.0-13.0 cm), respectively. The radiographic quality of reduction was graded as anatomical reduction (maximum residual displacement [MRD] ≤ 2 mm) in all cases, according to Matta’s criteria. Concerning the incidence of complications, there were no iatrogenic neurovascular injury, no surgical site infections, and no osteonecrosis of the femoral head or heterotopic ossification in this cohort. One patient with transverse with posterior wall fracture (group 1) experienced deep vein thrombosis in the lesion leg. Another two patients with solitary posterior wall fracture (group 2) developed posttraumatic osteoarthritis, with one diagnosed as Tonnis grade I lesion and the other as Tonnis grade III lesion. With respect to the clinical treatment outcome, the mean visual analogue scale (VAS), mean modified Harris Hip Score (mHHS) and subjective satisfaction rate were 1.7 (1.0-2.0), 90.6 (81-100), and 84.6% (80%-90%), respectively. Although there was no significant difference in the satisfaction rate (82.9% vs. 87.0%, P = 0.941) at 12 months after surgery, group 1 patients had more increased VAS score (2.0 vs. 1.2, P = 0.016) and more decreased mHHS (87.7 vs. 94.6, P = 0.014) than group 2 patients. Conclusions: Our pilot study confirmed that the “one-incision two-window” K-L approach is a simple, safe, reliable, and effective way to manage acute, displaced posterior wall or column acetabular fractures.

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