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1.
Arthrosc Tech ; 12(10): e1715-e1719, 2023 Oct.
Article En | MEDLINE | ID: mdl-37942094

Ulnar collateral ligament (UCL) repair with suture augmentation has been increasingly used to treat UCL pathology in overhead athletes. For the appropriately indicated patient, UCL repair with suture augmentation without reconstruction has promising results. Advantages of repair with suture augmentation include earlier return to sport, low complication rate, and decreased operative time since there is no need for graft harvest. Previously reported techniques use suture anchors with high-tensile and collagen-coated nonabsorbable sutures. This article provides an alternative augmentation method using a combination of anchors and bone tunnels to obtain an isometric repair.

2.
Arthrosc Sports Med Rehabil ; 5(3): e833-e838, 2023 Jun.
Article En | MEDLINE | ID: mdl-37388867

Purpose: The purpose of this study was to compare patient-reported outcomes and return to play (RTP) rates following ulnar collateral ligament reconstruction (UCLR) in patients with and without posteromedial elbow impingement (PI) treated with concomitant arthroscopic posteromedial osteophyte resection. Methods: Baseball players who underwent UCLR performed by the senior surgeon with minimum follow-up of 2 years were surveyed in this retrospective cohort study. Primary outcomes included Kerlan-Jobe Orthopaedic Clinic Shoulder and Elbow (KJOC) score, Andrews-Timmerman score, and RTP rate. Secondary outcomes included patient satisfaction scores. Results: 35 baseball players were included. Eighteen had no preoperative impingement (mean age: 19.06 ± 3.28 years), while 17 had PI treated with concomitant arthroscopic osteophyte resection (mean age: 20.06 ± 2.68 years). Following surgery, there was no difference in mean Andrews-Timmerman score (no impingement = 91.67 ± 8.04 vs PI = 92.06 ± 7.92, P = .89) nor KJOC score (no impingement = 83.36 ± 11.72 vs PI = 79.88 ± 12.35, P = .40), but there was a decreased mean KJOC throwing control sub-score in the PI group (7.65 ± 2.40 vs 9.11 ± 1.32, P = .04). There was no difference in RTP rate between the groups (no impingement = 72.22%, PI = 94.12%, χ2 = 1.28; P = .26). There was significantly higher mean satisfaction score in the no impingement group (96.67 ± 4.58 vs 90.12 ± 11.91; P = .04), and those patients were also more likely to pursue surgical treatment again (94.44% vs 52.94%, χ2 = 7.88; P = .005). Conclusions: There was no difference in RTP rate following ulnar collateral ligament reconstruction in baseball players with and without posteromedial impingement treated with arthroscopic resection. Outcomes on the KJOC and Andrews-Timmerman scores were good to excellent in both groups. Players in the posteromedial impingement group were less satisfied with their outcome, however, and less likely to elect for surgery if they were to sustain the injury again. Additionally, players in the posteromedial impingement group were found to have decreased throwing control on the KJOC questionnaire, which may suggest that the presence of posteromedial osteophytes represent adaptive changes to stabilize the elbow while throwing. Level of Evidence: Level III, retrospective cohort study.

3.
Arthrosc Tech ; 12(1): e53-e57, 2023 Jan.
Article En | MEDLINE | ID: mdl-36814975

Glenohumeral instability causing bipolar bone loss is increasingly being recognized and treated to minimize recurrence. Large Hill-Sachs and reverse Hill-Sachs lesions of the humerus must be addressed at the time of surgery to prevent recurrent dislocations and restore the native anatomic track. For patients with epilepsy, locked dislocations may create defects that must be addressed with bony procedures, including osteochondral allograft reconstruction as soft-tissue remplissage may not adequately addresses the magnitude of the bone loss. Osteochondral allografts have been successfully used to address bony defects ranging from 20% to 30% of humeral bone loss whereas shoulder arthroplasty is indicated for larger defects where the native anatomy can no longer be restored. In this Technical Note, we present a technique to address concomitant large Hill-Sachs and reverse Hill-Sachs lesions.

4.
Knee Surg Sports Traumatol Arthrosc ; 31(2): 455-463, 2023 Feb.
Article En | MEDLINE | ID: mdl-35841396

PURPOSE: There is little information on patients most at risk for poor outcomes following surgical repair of extensor mechanism tendon injuries. The purpose of this study is to provide an epidemiological overview of patients undergoing patellar or quadriceps tendon repair and to assess the incidence of postoperative complications, readmissions, and revision repairs among this population. METHODS: Retrospective data were obtained using the PearlDiver database for patellar tendon repair and quadriceps tendon repair patients between 2010 and 2020. Baseline demographics, incidences of 90-day readmissions and postoperative complications, and reoperation rates were collected for each group. Multivariate logistic regression was performed to assess the predictive power of each demographic variable on the incidence of postoperative complications and reoperations. RESULTS: In total, 1543 patients underwent patellar tendon repair and 601 underwent quadriceps tendon repair. Complications within 90-days were observed in 33.7% of patients with patellar tendon repair and 39.2% of patients with quadriceps tendon repair. Reoperation rates were 4.2% and 4.8% for patellar tendon repair and quadriceps tendon repair, respectively. Females in both patellar tendon repair and quadriceps tendon repair groups were at significantly higher risk for post-operative complications (patellar tendon repair OR 3.0, 95% CI 2.4-3.7; quadriceps tendon repair OR 2.9, 95% CI 1.9-4.6; p < 0.001 for both). Older age (p < 0.001), female gender (p < 0.001), CCI (p < 0.001), tobacco use (p < 0.001), and obesity (p < 0.01) were all predictors of experiencing at least one complication following patellar tendon repair. For quadriceps tendon repair, female gender (p < 0.001) and CCI (p < 0.001) were the strongest predictors of experiencing at least one complication, while older age, tobacco use, and obesity (p < 0.05 for all) were also significant independent predictors. CONCLUSION: Patellar tendon repair patients are younger on average than quadriceps tendon repair patients. Although females are less likely to sustain extensor mechanism ruptures compared to males, females are significantly more likely to have at least one complication after quadriceps or patellar tendon repair. These findings may be used by surgeons, patients, and payors to understand who is most at risk for adverse outcomes following extensor mechanism repair surgery, resulting in earlier intervention and counseling to reduce the likelihood of a poor outcome following extensor mechanism repair surgery. LEVEL OF EVIDENCE: Level III.


Patellar Ligament , Postoperative Complications , Female , Humans , Male , Cross-Sectional Studies , Obesity , Patellar Ligament/surgery , Postoperative Complications/epidemiology , Reoperation , Retrospective Studies , Tobacco Use
6.
Arthrosc Tech ; 11(11): e2061-e2066, 2022 Nov.
Article En | MEDLINE | ID: mdl-36457402

There is a lack of literature regarding arthroscopic access to the posterior peripheral compartment of the hip. Compared with open surgery, arthroscopy offers less-invasive treatment for intra-articular mass excision. Arthroscopic hip mass excision has focused on selective resection of lesions in the central compartment and anterior peripheral compartment due to difficult and previously undescribed posterior access. We introduce a technique for arthroscopic excision of a posterior intra-articular hip mass consistent with pigmented villonodular synovitis, also known as tenosynovial giant cell tumor, using a modified T-capsulotomy based on the lateral aspect of the hip capsule. This modified capsulotomy allows for more posterior and lateral access to the central and peripheral compartments while minimizing violation of the iliofemoral ligament.

7.
Article En | MEDLINE | ID: mdl-36338798

Surgical treatment options for proximal humeral fractures include hemiarthroplasty (HA), reverse shoulder arthroplasty (RSA), and open reduction and internal fixation (ORIF). The objectives of this study were to analyze the trends in surgical treatment of proximal humeral fractures across a decade and to compare complications, reoperation rates, and readmission rates between ORIF and RSA. Methods: The PearlDiver MUExtr Database was used to identify patients with proximal humeral fractures who were treated with ORIF, HA, or RSA between 2010 and 2019 and analyze yearly trends. Complications, revision procedures, demographic characteristics, comorbidities, and emergency room visits and hospital readmissions within 90 days of the surgical procedure were compared between ORIF and RSA cohorts for patients who had at least 2-year follow-up data. Results: In this study, 384,158 patients with proximal humeral fractures were identified in the 10-year period between 2010 and 2019. There was a significant increase in the frequency of RSA and a decrease in the frequency of ORIF and HA over time (p < 0.0001). Compared with patients who underwent ORIF or HA, patients who underwent RSA were more likely to be older (p < 0.0001), to be female, and to have a higher Charlson Comorbidity Index. Patients who underwent ORIF had higher complication rates (23.03% compared with 18.62%; p < 0.0001) and higher reoperation rates (20.3% compared with 10.3%; p < 0.0001) than patients who underwent RSA. Patients who underwent RSA had higher emergency room visit rates (20.0% compared with 16.7%; p < 0.001) and hospital readmission rates (12.9% compared with 7.3%; p < 0.0001) within 90 days of the surgical procedure compared with patients who underwent ORIF. Conclusions: There has been an increasing trend in RSA utilization for the surgical treatment of proximal humeral fractures, along with a decreasing trend in HA and ORIF, over time. Patients who underwent ORIF for a proximal humeral fracture had higher complication and reoperation rates compared with patients who underwent RSA. Patients who underwent RSA had higher emergency room visit and hospital readmission rates within 90 days of the surgical procedure compared with patients who underwent ORIF, which may be attributable to the RSA cohort being older and having more comorbidities. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

8.
Arthrosc Tech ; 11(10): e1715-e1719, 2022 Oct.
Article En | MEDLINE | ID: mdl-36311328

Intra-articular ganglion cysts in the knee large enough to cause neurovascular claudication are rare entities only identified in singular case reports. The severity of claudication can cause debilitating symptoms and pain to previously highly functional and asymptomatic patients. Total knee arthroplasty has been described to treat these cysts in elderly patients with osteoarthritis, although this treatment pathway may not appeal to patients without antecedent pain and high activity levels. This surgical report will detail a reproducible method of arthroscopic decompression of posterior, intra-articular cysts to relieve vascular claudication by highlighting technical pearls in navigating posterior knee arthroscopy.

9.
Arthrosc Tech ; 11(6): e1117-e1122, 2022 Jun.
Article En | MEDLINE | ID: mdl-35782842

Multiple approaches for management of the hip capsule during hip arthroscopy for femoroacetabular impingement syndrome have been reported. Capsular closure is advocated in the setting of larger capsulotomies, including interportal and T-capsulotomies, to reduce the risk of iatrogenic instability or microinstability of the hip. The periportal capsulotomy technique has been described for conservative management of the capsule that would not necessitate closure. However, hip arthroscopy for patients with ligamentous laxity or joint hypermobility may warrant capsule closure or plication even with use of conservative capsulotomy techniques. We introduce a technique for closure of periportal capsulotomy as a means to repair or plicate the hip capsule in the at-risk hypermobile patient.

10.
Arthrosc Tech ; 11(12): e2195-e2203, 2022 Dec.
Article En | MEDLINE | ID: mdl-36632393

Suture or tape augmentation for anterior cruciate ligament (ACL) reconstruction has been described as a technique to increase biomechanical strength and potentially improve clinical outcomes. However, the suture or tape used for augmentation usually requires independent tibial fixation from the ACL graft in the form of an anchor or post. This may introduce the potential for graft and augment tension mismatch, while increasing surgical cost. We present our technique for ACL reconstruction with postless tape augmentation. The ACL graft and tape are fixed at the same tension with interference fixation using a single tibial sheath and screw construct, which allows for ACL augmentation without the need for an additional post or implant.

11.
Curr Rev Musculoskelet Med ; 13(6): 734-747, 2020 Dec.
Article En | MEDLINE | ID: mdl-32827301

PURPOSE OF REVIEW: This review presents epidemiology, etiology, management, and surgical outcomes of rotator cuff injuries in tennis players. RECENT FINDINGS: Rotator cuff injuries in tennis players are usually progressive overuse injuries ranging from partial-thickness articular- or bursal-sided tears to full-thickness tears. Most injuries are partial-thickness articular-sided tears, while full-thickness tears tend to occur in older-aged players. The serve is the most energy-demanding motion in the sport, and it accounts for 45 to 60% of all strokes performed in a tennis match, putting the shoulder at increased risk of overuse injury and rotator cuff tears. Studies have shown deficits in shoulder range of motion and scapular dyskinesia to occur even acutely after a tennis match. First-line treatment for rotator cuff injuries in any overhead athlete consists of conservative non-operative management with appropriate rest, anti-inflammatory drugs, followed by a specific rehabilitation program. Operative treatment is usually reserved for older-aged players and to those who fail to return to play after conservative measures. Surgical options include rotator cuff debridement with or without tendon repair, biceps tenodesis, and labral procedures. Unlike rotator cuff repairs in the general population, repairs in the elite tennis athlete have less than ideal rates of return to sport to the same level of performance. Rotator cuff injuries are a common cause of pain and dysfunction in tennis players and other overhead athletes. The etiology of rotator cuff tears in tennis players is multifactorial and usually results from microtrauma and internal impingement in the younger athlete leading to partial tearing and degenerative full-thickness tears in older players. Surgical treatment is pursued in athletes who are still symptomatic despite an extensive course of non-operative treatment as outcomes with regard to returning to sport to the same pre-injury level are modest at best. Debridement alone is usually preferred over rotator cuff repairs for partial tears in younger players due to potential over-constraining of the shoulder joint and decreased rates of return to sport after rotator cuff repairs.

12.
Injury ; 51(11): 2710-2716, 2020 Nov.
Article En | MEDLINE | ID: mdl-32773115

The optimal treatment of Achilles tendon ruptures (ATRs) is a subject of some debate amongst orthopedic surgeons. Many patients' understanding of Achilles injuries is limited and may be more informed by popular culture than anything objective. We sought to assess patient perceptions of ATRs using a proprietary questionnaire and correlate that with demographic information and the health literacy of the patient. Patients presenting with an Achilles tendon injury were asked to fill out a demographic form, the Literacy in Musculoskeletal Problems (LiMP) survey, to assess musculoskeletal health literacy, and a 22-question survey on ATRs designed to assess patient knowledge and perception of ATRs. Seventy percent of patients responded that surgery with or without other modalities is the most appropriate treatment for ATRs, while only 20% of patients responded that nonoperative treatment is most appropriate. Perceptions of treatment were not associated with demographic data or LiMP scores and appear to be biased to some degree towards surgery. In a setting in which the optimal treatment has not been fully worked out by surgeons, it is difficult to tell what influence patient perceptions may have on treatment, although it is possible these patient perceptions may cause surgeons to be more surgically aggressive.


Achilles Tendon , Tendon Injuries , Achilles Tendon/surgery , Humans , Perception , Rupture , Surveys and Questionnaires , Tendon Injuries/surgery , Treatment Outcome
13.
Clin Sports Med ; 39(3): 549-563, 2020 Jul.
Article En | MEDLINE | ID: mdl-32446574

Common flexor-pronator tendon injuries and medial epicondylitis can be successfully treated nonoperatively in most cases. Operative treatment is reserved for patients with continued symptoms despite adequate nonoperative treatment or in high-level athletes with complete rupture of the common flexor-pronator tendon. The physical examination and workup of patients with flexor-pronator tendon injuries should focus on related or concomitant pathologies of the medial elbow. The gold standard for surgical treatment of flexor-pronator tendon ruptures or medial epicondylitis includes tendon debridement and reattachment.


Athletic Injuries/diagnosis , Athletic Injuries/therapy , Elbow Injuries , Tendon Injuries/diagnosis , Tendon Injuries/therapy , Athletic Injuries/surgery , Debridement , Elbow/anatomy & histology , Elbow/surgery , Elbow Tendinopathy/diagnosis , Elbow Tendinopathy/surgery , Elbow Tendinopathy/therapy , Humans , Physical Examination , Rupture , Tendon Injuries/surgery
14.
Arthrosc Tech ; 9(3): e339-e344, 2020 Mar.
Article En | MEDLINE | ID: mdl-32226740

The Outerbridge-Kashiwagi (O-K) procedure has conventionally been used for the treatment of osteoarthritis of the elbow and to treat posttraumatic sequelae including posttraumatic arthritis, stiffness, contracture, and ulnar neuritis. The procedure involves exposure of the posterior elbow joint as well creating a window posteriorly through the olecranon fossa to target anterior aspects of the elbow. Several case series have shown the O-K procedure to have good functional outcomes with minimal complications. Used mostly for the surgical treatment of adult osteoarthritis, the O-K procedure has not been previously described for the treatment of a pediatric supracondylar humerus fracture malunion. This article and accompanying video will present the pearls and discuss the technique of the O-K procedure used to treat the loss of elbow flexion as a sequelae of supracondylar humerus fracture malunion.

15.
Arthrosc Tech ; 9(2): e267-e273, 2020 Feb.
Article En | MEDLINE | ID: mdl-32099781

Latissimus dorsi tendon ruptures are less-common injuries that can occur in elite throwing athletes. Physical examination of the thrower with a latissimus injury may show ecchymosis of the upper arm and asymmetry of the posterior axillary fold along with possible weakness in shoulder adduction, extension, and internal rotation. Magnetic resonance imaging is used to confirm the diagnosis. Latissimus tendon ruptures are largely treated nonoperatively; surgical repair is only advocated for in professional throwing athletes with complete avulsion injuries or midsubstance latissimus tendon tears. Surgical repair options include the use of suture anchors, cortical suture buttons, or transosseous sutures via a single posterior axillary incision or a 2-incision technique. Given the limited literature on this topic, there have been no studies evaluating the different fixation options or surgical approaches for tendon repair. This article and accompanying video show the technique and discusses the technical pearls of a latissimus tendon repair using suture button fixation via a single-incision approach.

16.
Arthrosc Tech ; 9(1): e185-e189, 2020 Jan.
Article En | MEDLINE | ID: mdl-32021794

Large chondral lesions of the humeral head are often treated with total shoulder arthroplasty, but this may not be an ideal option for young, active patients. Humeral head resurfacing is another option, which better preserves the native biomechanics. This article and the accompanying video present the surgical technique of partial humeral head resurfacing, which further preserves the remaining healthy cartilage. It is described for a chondral lesion due to avascular necrosis, but the method has been successfully used to treat chondral lesions from a broad range of causes.

17.
J Shoulder Elbow Surg ; 29(4): 807-813, 2020 Apr.
Article En | MEDLINE | ID: mdl-31678023

BACKGROUND: Surgical duration is an independent predictor of short-term adverse outcomes after a variety of orthopedic procedures, both arthroscopic and open. However, this association in shoulder arthroplasty remains unclear. The purpose of this study was to identify the association between surgical duration and postoperative complications, as well as increased use of health care resources, after shoulder arthroplasty. METHODS: Primary shoulder arthroplasty procedures performed from 2005 to 2016 were identified in the American College of Surgeons National Surgical Quality Improvement Program database using Current Procedural Terminology codes. Surgical duration was divided into 3 cohorts: (1) surgical procedures lasting less than 90 minutes, (2) those lasting between 90 and 120 minutes, and (3) those lasting more than 120 minutes. Baseline patient characteristics and outcome variables were compared using bivariate analysis. Outcome variables were compared using multivariate analysis. RESULTS: Overall, 14,106 patients were identified. Longer surgical duration was significantly associated with younger age, male patients, higher body mass index, and use of general anesthesia, (P < .001 for each), as well as smoking history (P < .39). Relative to operative times shorter than 90 minutes, surgical procedures lasting more than 120 minutes had higher rates of any complication (P = .002), return to the operating room (P = .008), urinary tract infection (P = .02), non-home discharge (P < .001), blood transfusion (P < .001), and unplanned 30-day hospital readmission (P = .03). CONCLUSION: Increasing surgical duration was associated with a variety of postoperative medical complications and increased use of health care resources including discharge to acute care facilities, blood transfusions, and hospital readmission. These data suggest that surgical duration should be considered for postoperative risk stratification, as well as patient counseling, and may be a surgeon-modifiable risk factor independent of patient risk factors.


Arthroplasty, Replacement, Shoulder/adverse effects , Postoperative Complications/etiology , Quality Improvement , Aged , Aged, 80 and over , Body Mass Index , Female , Humans , Incidence , Male , Middle Aged , Operative Time , Patient Readmission/trends , Postoperative Complications/epidemiology , Risk Factors , Time Factors , United States/epidemiology
18.
J Spine Surg ; 5(1): 110-115, 2019 Mar.
Article En | MEDLINE | ID: mdl-31032445

BACKGROUND: Objective of this study is to evaluate demographics, risk factors, and incidence of instrumentation related complications (IRC) in spinal surgeries from 2009-2012. The Scoliosis Research Society (SRS) morbidity and mortality (M&M) database has tremendous value in orthopaedic surgery. SRS gathers surgeon-reported complications, including instrumentation failure, visual complications, neurological deficits, infections, and death. Limited literature exists on the incidence of perioperative instrumentation complications in deformity surgery. We utilized the SRS database to evaluate demographics, risk factors, and incidence of IRC in spinal surgeries from 2009-2012. METHODS: The SRS M&M database was queried for IRC in patients undergoing surgery for scoliosis, spondylolisthesis, and kyphosis from 2009-2012. Demographics, comorbidities, diagnoses, curve magnitude, and intraoperative characteristics were analyzed. Intraoperative characteristics included surgical approach, performance of fusion or osteotomy, operative times, blood loss, instrumentation used, and documented instrumentation complication. RESULTS: A total of 167,972 patients were identified, including 311 IRC. The overall IRC rate was 0.19% (18.5 per 10,000 patients), which decreased significantly from 2009-2012 (0.37% vs. 0.19%, P<0.001). The mean age of patients with IRC was 38.5±25.5 years. Most common comorbidities included hypertension (23.5%), pulmonary disease (13.5%), diabetes (10.6%), smoking (8.7%), and vascular disease (7.1%). IRC occurred in 206 (66.2%) patients with scoliosis, 58 (18.6%) with spondylolisthesis, and 45 (14.5%) with kyphosis. Compared to patients with spondylolisthesis, patients with kyphosis (0.27% vs. 0.11%, P<0.001) and scoliosis (0.21% vs. 0.11%, P<0.001), experienced significantly more IRC. IRC included implant failure (23.3%), migration (28.3%), and malpositioned implants (48.6%). New perioperative neurologic deficits were reported in 146 (46.9%) patients, and 84 (27%) of these implants were removed. CONCLUSIONS: IRC occur in approximately 18.5 per 10,000 deformity patients, with a rate significantly higher in patients with kyphosis. The potentially avoidable occurrence of implant malpositioning represents nearly 50% of these complications. Closer attention to posterior bony anatomy, improved intraoperative imaging with utilization of navigation or robotic guidance may decrease these complications.

19.
Arthrosc Tech ; 8(11): e1367-e1371, 2019 Nov.
Article En | MEDLINE | ID: mdl-31890509

Medial epicondylitis, also known as "golfer's elbow," is a common orthopaedic condition that typically results from overuse of the flexor pronator mass. Repetitive eccentric loading of the muscles responsible for wrist flexion and forearm pronation leads to microtrauma and subsequent degeneration of the flexor pronator tendon. Patients with medial epicondylitis typically present in the fourth to sixth decade of life and have an insidious onset of medial elbow pain. Occasionally, medial epicondylitis may result from an acute traumatic event, such as an acute avulsion of the common flexor tendon. Patients should be examined for concomitant elbow pathologies, including ulnar neuritis and ulnar collateral ligament injury. T2-weighted magnetic resonance imaging can show increased signal intensity in the common flexor tendon or a complete rupture. Nonsurgical management is the mainstay of treatment; however, surgical treatment may be indicated in elite athletes and patients with persistent symptoms after conservative treatment. This technique article with accompanying video describes open debridement and repair of the flexor pronator tendon, with an emphasis on restoration of the anatomic footprint and compression across the repair site to promote biological healing.

20.
Spine Deform ; 6(2): 130-136, 2018.
Article En | MEDLINE | ID: mdl-29413734

STUDY DESIGN: Case series. OBJECTIVES: To determine the safety and feasibility of S2 alar-iliac (S2AI) screw placement under robotic guidance. SUMMARY OF BACKGROUND DATA: Similar to standard iliac fixation, S2AI screws aid in achieving fixation across the sacropelvic junction and decreasing S1 screw strain. Fortunately, the S2AI technique minimizes prominent instrumentation and the need for offset connectors to the fusion construct. Herein, we present an analysis of the largest series of robotic-guided S2AI screws in the literature without any significant author conflicts of interest with the robotics industry. METHODS: Twenty-three consecutive patients who underwent spinopelvic fixation with 46 S2AI screws under robotic guidance were analyzed from 2015 to 2016. Screws were placed by two senior spine surgeons, along with various fellow or resident surgical assistants, using a proprietary robotic guidance system (Renaissance; Mazor Robotics Ltd., Caesara, Israel). Screw position and accuracy was assessed on intraoperative CT O-arm scans and analyzed using three-dimensional interactive viewing and manipulation of the images. RESULTS: The average caudal angle in the sagittal plane was 31.0° ± 10.0°. The average horizontal angle in the axial plane using the posterior superior iliac spine as a reference was 42.8° ± 6.6°. The average S1 screw to S2AI screw angle was 11.3° ± 9.9°. Two violations of the iliac cortex were noted, with an average breach distance of 7.9 ± 4.8 mm. One breach was posterior (2.2%) and one was anterior (2.2%). The overall robotic S2AI screw accuracy rate was 95.7%. There were no intraoperative neurologic, vascular, or visceral complications related to the placement of the S2AI screws. CONCLUSIONS: Spinopelvic fixation achieved using a bone-mounted miniature robotic-guided S2AI screw insertion technique is safe and reliable. Despite two breaches, no complications related to the placement of the S2AI screws occurred in this series. LEVEL OF EVIDENCE: Level IV, therapeutic.


Bone Screws/adverse effects , Ilium/surgery , Robotics/methods , Sacroiliac Joint/surgery , Sacrum/surgery , Spinal Fusion/instrumentation , Aged , Bone Screws/standards , Feasibility Studies , Female , Humans , Imaging, Three-Dimensional/methods , Intraoperative Care , Male , Middle Aged , Outcome Assessment, Health Care , Retrospective Studies , Safety , Surgery, Computer-Assisted/methods , Surgical Fixation Devices/statistics & numerical data
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