Arthroscopic reduction and hollow screw internal fixation for Eyres Type IIIA scapular coracoid fracture: a case report.

BACKGROUND: A coracoid process fracture combined with an acromioclavicular (AC) joint dislocation is an uncommon injury that typically causes significant pain and limits shoulder movement. Open reduction and internal fixation have been the traditional treatment approach. However, arthroscopic techniques are emerging as a promising alternative for managing these injuries. CASE REPRESENTATION: A 35-year-old woman presented with right shoulder pain following an accidental fall. Imaging studies revealed a coracoid process fracture along with an AC joint dislocation. The fracture was classified as an Eyres Type IIIA, which warranted surgical intervention. Our team performed arthroscopic coracoid fracture reduction and internal fixation surgery, as well as AC joint dislocation repair using Kirschner wires. Six months after surgery, the patient demonstrated a satisfactory functional outcome with complete bone healing. CONCLUSION: This case report highlights the potential of arthroscopic reduction and fixation as a novel treatment option for fractures of the coracoid base.

[Research progress of Chinese unique Inlay Bristow (Cuistow surgery) using suture button fixation].

Objective: To explore the research progress of the coracoid transfer surgery using suture button fixation, particularly focusing on the technique known as Chinese unique Inlay Bristow (Cuistow surgery). Methods: Extensive literature review was conducted to summarize and analyze the utilization of suture button fixation in the Cuistow surgery, comparing its biomechanical and clinical outcomes with those of traditional screw fixation. Results: Utilizing suture button fixation in coracoid transfer surgery helps circumvent certain metal-related complications associated with traditional screw fixation. While its biomechanical stability and effectiveness have been preliminarily confirmed, debates persist regarding its graft healing rate and postoperative recurrence rate compared to traditional screw fixation. The Cuistow surgery based on the Inlay structure is a solution to improve the healing rate of graft after suture button fixation. Conclusion: Suture button fixation, as a novel approach in coracoid transfer surgery, remains to have its advantages and disadvantages compared to traditional screw fixation not entirely elucidated, underscoring the need for further in-depth clinical and fundamental research. Cuistow surgery is the Chinese experience of coracoid transfer surgery, and its biomechanical stability and clinical advantages have been preliminarily confirmed.

[Early-term effectiveness of Latarjet procedure by coracoid osteotomy with preserving coracoacromial ligament for recurrent anterior shoulder dislocation].

Objective: To evaluate the early-term effectiveness of Latarjet procedure with double EndoButtons fixation for recurrent anterior shoulder dislocation by coracoid osteotomy with preserving coracoacromial ligament. Methods: Between January 2021 and June 2023, 19 patients with recurrent anterior shoulder dislocations were treated by arthroscopic Latarjet procedure with double EndoButtons fixation, all of which underwent coracoid osteotomy with preserving the coracoacromial ligament. There were 11 males and 8 females, with an average age of 23.3 years (range, 17-32 years). Shoulder dislocations ranged from 3 to 11 times, with an average of 6.4 times. The disease duration ranged from 3 to 35 months, with an average of 12.9 months. All apprehension tests were positive. Imaging examination showed that the defect width of the ipsilateral glenoid bone was 13%-26%, with an average of 19.8%. After operation, the shoulder range of motion was examined, including flexion lift, lateral external rotation, extension 90° external rotation, and internal rotation. Shoulder joint function was evaluated by Walch-Duplay score, American Association for Shoulder and Elbow Surgery (ASES) score, and Rowe score. Imaging examinations were taken to observe the position and shaping of coracoid. Results: All incisions healed by first intention and no nerve or vessel injury occurred. All patients were followed up 9-24 months (mean, 14.5 months). There was no recurrence of shoulder dislocation and the apprehension tests were negative during follow-up. There was no significant difference in the shoulder range of motion (flexion lift, lateral external rotation, extension 90° external rotation, and internal rotation) between preoperation and at last follow-up ( P>0.05). The Walch-Duplay score, ASES score, and Rowe score significantly improved when compared with those before operation ( P<0.05). Postoperative imaging showed that coracoid graft was at the same level with the glenoid in all cases; the center of coracoid graft was located between 3 to 5 o'clock. During follow-up, there was no glenohumeral joint degeneration, the acromiaohumeral distance was not reduced when compared with preoperation, and the coracoid bone gradually formed concentric circles with the humeral head. Conclusion: The Latarjet procedure with double EndoButtons fixation can effectively treat recurrent anterior shoulder dislocation by coracoid osteotomy with preserving coracoacromial ligament, and the early-term effectiveness is satisfactory.

[Application of LU-tarjet congruent-arc technique in treatment of recurrent shoulder dislocation with huge glenoid defect].

Objective: To investigate the early effectiveness of the limited unique coracoid osteotomy suture button fixation Latarjet (LU-tarjet)-congruent-arc (CA) technique (LU-tarjet-CA) in treating recurrent shoulder dislocations with huge glenoid defect. Methods: The clinical data of 12 patients with recurrent shoulder dislocation and huge glenoid defect who met the selection criteria and treated with arthroscopic LU-tarjet-CA between January 2021 and December 2023 were retrospectively analyzed. The cohort included 8 males and 4 females, aged 20-40 years with an average age of 30.4 years. The range of glenoid bone loss was 30%-40%, with an average of 35.5%. The time from symptom onset to hospital admission ranged from 1 to 36 months, with an average of 18.5 months. The University of California Los Angeles (UCLA) score, American Association for Shoulder and Elbow Surgery (ASES) score, Walch-Duplay score, and Rowe score were used to evaluate shoulder function preoperatively and at 3, 6, and 12 months postoperatively. CT three-dimensional (3D) reconstruction was used to assess coracoid healing and plasticity at 3, 6, and 12 months postoperatively. Subjective satisfaction of patient was recorded at last follow-up. Results: All incisions healed by first intention, with no incision infection or nerve injury. All 12 patients were followed up 12 months. One patient developed Propionibacterium acnes infection within the joint postoperatively and recovered after initial arthroscopic debridement and anti-inflammatory treatment. At 3 months after operation, CT 3D-reconstruction showed 1 case of complete coracoid absorption; neither of these two patients experienced redislocation. The remaining patients exhibited partial coracoid absorption but displayed local reshaping, filling the preoperative defect area, and bony fusion between the coracoid and the glenoid. At last follow-up, 9 patients (75%) were very satisfied with the outcome, and 3 patients (25%) were satisfied; the satisfied patients experienced postoperative shoulder stiffness caused by suboptimal functional exercise but did not have impaired daily life activities. The UCLA score, ASES score, Walch-Duplay score, and Rowe score at 3, 6, and 12 months postoperatively were significantly better than preoperative scores, and each score improved further over time postoperatively, with significant differences between different time points ( P<0.05). Conclusion: The arthroscopic LU-tarjet-CA technique for treating recurrent shoulder dislocations with huge glenoid defect can achieve the surgical objective of bony blockade and filling bone defects to prevent shoulder dislocation, thereby improving patients' quality of life and shoulder joint function and stability.

Symptomatic Nonunion of the Coracoid Process Following Osteosynthesis Using a Suture Button for Coracoid Process and Distal Clavicle Fracture: A Case Report.

BACKGROUND Coracoid process fractures are uncommon and are often complicated by many types of shoulder girdle injuries. Previous reports have shown that osteosynthesis for isolated coracoid process fractures results in favorable outcomes and high bone union rates. However, owing to the rarity of coracoid process fractures combined with distal clavicle fractures, there are limited data to guide treatment strategies. We report a case of symptomatic nonunion despite performing osteosynthesis for fractures of the coracoid process and distal clavicle. CASE REPORT A 60-year-old man presented with left shoulder pain after falling from the back of a truck. Radiography and computed tomography (CT) findings revealed fractures of the left distal clavicle and coracoid process. We performed plate and costoclavicular fixation using a suture button for the distal clavicle fracture and cannulated cancellous screw fixation for the coracoid process fracture. However, the patient experienced severe pain around the coracoid and had limited shoulder range of motion 1 year postoperatively. CT revealed nonunion of the coracoid process, prompting a recommendation for surgery. However, despite severe persistent functional impairment, the patient refused surgery 1.5 years postoperatively. CONCLUSIONS This case suggests the potential for symptomatic nonunion of the coracoid process when using a suture-button device for a distal clavicle fracture. To prevent postoperative nonunion of the coracoid process, postoperative CT evaluation is necessary. If a symptomatic delayed bone union of coracoid process is observed, considering early removal of the suture button is recommended.

Postoperative Radiographic Outcomes Following Primary Open Coracoid Transfer (Bristow-Latarjet) Vary in Definition, Classification, and Imaging Modality: A Systematic Review.

PURPOSE: To analyze radiographic outcomes by conventional radiography, computed tomography (CT), or both and complication rates of open coracoid transfer at a minimum of 12-months follow-up. METHODS: A literature search was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, using PubMed, Medline (Ovid), and EMBASE library databases. Inclusion criteria were clinical studies reporting on open Latarjet as the primary surgical procedure(revision coracoid transfer after failed prior stabilization excluded) with postoperative radiographic outcomes at a minimum mean 1-year follow-up. Patient demographics, type of postoperative imaging modality, and radiographic outcomes and complications including graft union, osteoarthritis, and osteolysis were systematically reviewed. Data were summarized as ranges of reported values for each outcome metric. Each radiographic outcome was graphically represented in a Forest plot with point estimates of the incidence of radiographic outcomes with corresponding 95% confidence intervals and I2. RESULTS: Thirty-three studies met inclusion criteria, with a total of 1,456 shoulders. The most common postoperative imaging modality was plain radiography only (n = 848 [58.2%]), both CT and radiography (n = 287 [19.7%]), and CT only (n = 321 [22.1%]). Overall, the reported graft union rate ranged from 75% to 100%, of which 79.8% (n = 395) were detected on plain radiography. The most common reported postoperative radiographic complications after the open coracoid transfer were osteoarthritis (range, 0%-100%, pooled mean 28%), graft osteolysis (range, 0%-100%, pooled mean 30%), nonunion (range, 0%-32%, pooled mean 5.1%), malpositioned graft (range, 0%-75%, pooled mean 14.75%), hardware issues (range, 0%-9.1%, pooled mean 5%), and bone block fracture (range, 0%-8%, pooled mean 2.1%). Graft healing was achieved in a majority of cases (range, 75%-100%). CONCLUSION: Postoperative radiographic outcomes after open coracoid transfer vary greatly in definition, classification, and imaging modality of choice. Greater consistency in postoperative radiographic outcomes is essential to evaluate graft healing, osteolysis, and nonunion. LEVEL OF EVIDENCE: Level IV, systematic review of Level III-IV studies.

Ipsilateral fractures of the acromion and coracoid processes of the scapula.

A fracture of the acromion and coracoid processes of scapula is rarely seen in the outpatient clinic, due to the acromion's anatomical position and shape, as well as the strong ligaments and muscles that are attached to it. These fractures are caused by either direct or indirect high-energy trauma injuries to the shoulder joint, leading to severe pain and a grossly restricted range of motion. Several acromial classifications were reported, but this type of longitudinal plane fracture of the acromion process in our case is yet to be described in the current literature. We present a rare combination of the coracoid process and unstable acromion bony projection fractures that have not previously been noted for this type of fracture. The closest to this is Kuhn's type III classification. A 51-year-old male presented to our emergency department complaining of the right shoulder pain and difficulty raising his arm following a 2-wheeler accident. The patient was managed by open reduction and internal fixation with 3 cannulated cancellous screws fixation and progressed well with no postoperative complications. He was asymptomatic postoperatively and regained full range of motion after 4 months.

Coracoid Process Fractures of the Scapula Treated by Baseplate Three-Column Glenoid Fixation: A Retrospective Study of 24 Patients.

BACKGROUND This retrospective study from a single center aimed to evaluate 24 patients with coracoid process fractures of the scapula treated by baseplate three-column glenoid fixation of the 3 columns attached to the glenoid, or the scapula-glenoid construct, which includes the base of the coracoid, the scapular spine, and the lateral/scapular pillar. MATERIAL AND METHODS Twenty-four patients with 24 coracoid process fractures were treated from March 2018 to August 2020 in our hospital; 11 cases were treated with the modified technique and 13 with the conventional technique. The patients had comparable screw length, bone union time, fracture reduction, and Constant-Murley shoulder outcome scores. The significant differences between variables were tested using the t test and Fisher's exact test, while bone union and reduction position were confirmed with X-ray and CT scans. The average follow-up time was 12 months. RESULTS The mean Constant-Murley shoulder outcome score and fracture reduction did not differ significantly (P>0.05), and all patients returned to their previous occupations and levels of activity, with no loss of reduction or surgical revision at the last follow-up. Bone union time for the modified group was longer than that of the conventional group (P<0.05). However, 1 patient had a screw broken at 5 months from heavy manual labor and showed delayed union at 8 months. The lengths of the coracoid process screws in the modified group were longer than in the conventional group (P<0.01). CONCLUSIONS The findings from this retrospective study showed that baseplate three-column glenoid fixation of the coracoid process was a good surgical option for coracoid process fractures.

The X-Mas Box Osteosuture: A New Technique for Coracoid Process Fracture.

A fracture of the tip of the coracoid is a rare but challenging fracture. A surgical indication is required in case of a displaced fracture. Screws and suture anchors often do not offer a reliable fixation in the case of very small fragments. We describe our hardwareless technique that consists of an osteosuture with a 90-degree suture threads configuration that we called the x-mas box technique. This procedure is cost-effective and it provides stable fixation and low complications rate.

Bone tunnel placement influences shear stresses at the coracoid process after coracoclavicular ligament reconstruction: a finite element study and radiological analysis.

INTRODUCTION: Coracoid fractures after arthroscopic treatment of acromioclavicular (AC) joint separations lead to poor clinical outcomes. In this study, different configurations of bone tunnels in the lateral clavicle and coracoid were examined concerning the amount of stress induced in the coracoid. METHODS: An authentic 3D finite element model of an ac joint was established. Three 2.4 mm bone tunnels were inserted in the lateral clavicle, which were situated above, medially and laterally of the coracoid. Then, two 2.4 mm bone tunnels were inserted in the latter, each simulating a proximal and a distal suture button position. Von Mises stress analyses were performed to evaluate the amount of stress caused in the coracoid process by the different configurations. Then, a clinical series of radiographs was examined, the placement of the clavicle drill hole was analyzed and the number of dangerous configurations was recorded. RESULTS: The safest configuration was a proximal tunnel in the coracoid combined with a lateral bone tunnel in the clavicle, leading to an oblique traction at the coracoid. A distal bone tunnel in the coracoid and perpendicular traction as well as a proximal tunnel in the coracoid with medial traction caused the highest stresses. Anatomical placement of the clavicle drill hole does lead to configurations with smaller stresses. CONCLUSION: The bone tunnel placement with the smallest amount of shear stresses was found when the traction of the suture button was directed slightly lateral, towards the AC joint. Anatomical placement of the clavicle drill hole alone was not sufficient in preventing dangerous configurations. LEVEL OF EVIDENCE: Controlled laboratory study.

Computed Tomography-Based Determination of the Optimal Locations of Bone Tunnels for Coracoclavicular Ligament Reconstruction.

OBJECTIVE: An agreement has not been reached on optimal locations of bone tunnels for coracoclavicular ligament (CCL) reconstruction for acromioclavicular joint dislocation (ACD). This study aims to identify the convergence point (cP) between the coracoid process and clavicle in the Chinese population to assist surgeons in reconstructing the CCL for ACD. METHODS: From 2014 to 2020, 483 CT scans of the shoulders of 270 male and 213 female patients (247 right and 236 left shoulders) were collected and studied retrospectively. By overlapping the images of the transverse plane of the coracoid process and the clavicle, points a and b, and the midpoint ab (cP) were determined. Then, a series of parameters through point cP in the transverse and sagittal planes were measured. In the transverse plane this included the distance from point cP to the tip of the coracoid process (cP-cor),the distance between the medial and lateral margins of the coracoid process through point cP (Med-lat cor), the distance from point cP to the acromioclavicular joint (cP-ac), and the distance between the anteroposterior margin of the clavicle through point cP (Ap-clav). In the sagittal plane, this included the craniocaudal segment of the coracoid process (Cc-cor), and the craniocaudal segment of the clavicle (Cc-clav). The sex and side differences of these measurements were also analyzed by two radiologists. RESULTS: Based on the following measurements, point cP was determined. For male patients, the cP-cor was 28.02 ± 3.43 mm, Med-lat cor was 22.78 ± 2.80 mm, Cc-cor was 15.11 ± 2.13 mm, cP-ac was 29.24 ± 3.84 mm, Ap-clav was 18.27 ± 2.46 mm, and Cc-clav was 10.09 ± 1.56 mm. For female patients, the cP-cor was 25.20 ± 3.26 mm, Med-lat cor was 20.21 ± 2.97 mm, Cc-cor was 13.03 ± 1.77 mm, cP-ac was 26.66 ± 3.45 mm, Ap-clav was 16.10 ± 2.30 mm, and Cc-clav was 8.91 ± 1.40 mm. All the measurements of female patients were lower than those of male patients (p < 0.01). Between sides, only cP-ac of the left shoulders was significantly lower than those of the right shoulders (p < 0.05), with no significant differences in other parameters between sides (p > 0.05). CONCLUSION: The results of this study identified the locations of bone tunnel-cP in the coracoid process and clavicle for the CCL reconstruction in ACD. Moreover, the findings indicated that surgeons should be more cautious in operating on female patients and that the cP-ac of left shoulders should be set lower than that of right shoulders.

[Short-term effectiveness of modified arthroscopic Latarjet procedure with double EndoButtons for recurrent anterior shoulder dislocation].

Objective: To evaluate the short-term effectiveness of modified arthroscopic Latarjet procedure with double EndoButtons for recurrent anterior shoulder dislocation. Methods: Between January 2019 and November 2020, 36 patients with recurrent anterior shoulder dislocation were treated by modified arthroscopic Latarjet procedure with double EndoButtons. There were 26 males and 10 females, with an average age of 27.8 years (range, 18-36 years). The number of shoulder dislocations ranged from 3 to 12 times, with an average of 6.5 times. The disease duration ranged from 5 to 36 months, with an average of 16.2 months. Preoperative shoulder fear test was positive, and the Beighton score of joint relaxation was 0-4, with an average of 1.3. Imaging examination showed that the defect width of the ipsilateral glenoid bone was 16%-28%, with an average of 21.5%. Postoperative complications, recurrent dislocation, subluxation, and instability of shoulder joint were recorded. Shoulder range of motion was examined, including forward flexion, external rotation at side, external rotation at 90° abduction, and internal rotation. Shoulder joint function was evaluated by Walch-Duplay score, American Association for Shoulder and Elbow Surgery Score (ASES), and ROWE score. X-ray film and CT images were taken to observe the shaping of coracoid process graft. Results: All incisions healed by first intention, and no vascular or nerve injury occurred. All patients were followed up 12-28 months, with an average of 19.9 months. During follow-up, no shoulder dislocation recurred, and shoulder fear test was negative. At last follow-up, there was no significant difference in shoulder forward flexion, external rotation at side, external rotation at 90° abduction, and internal rotation when compared with preoperative values (P>0.05). The Walch-Duplay score, ASES score, and ROWE score of shoulder function significantly improved (P<0.05). Postoperative imaging examination showed that coracoid process graft was at the same level with the glenoid in 33 cases (91.7%), medial in 1 case (2.8%), and lateral in 2 cases (5.6%); the center of coracoid process graft was mainly located between 3 to 5 o'clock in 33 cases (91.7%), higher than 3 o'clock in 1 case (2.8%), and lower than 5 o'clock in 2 cases (5.6%). There was no obvious glenohumeral joint degeneration during follow-up, and the coracoid process graft gradually formed concentric circles with the humeral head. Conclusion: The modified arthroscopic Latarjet procedure with double EndoButtons can effectively treat recurrent anterior shoulder dislocation, and the short-term effectiveness is satisfactory, and the position of coracoid process graft is accurate.

Comparison of two coracoid process transfer techniques on stress shielding using three-dimensional finite-element model.

BACKGROUND: We created patient-based 3D finite-element (FE) models that simulate the congruent-arc Latarjet (CAL) and traditional Latarjet (TL) procedures and then compared their stress distribution patterns with different arm positions and glenoid defects. METHODS: The computed tomography data of 10 adult patients (9 men and 1 woman, ages: 18-50 years) were used to develop the 3D FE glenohumeral joint models. Twenty-five and 35% bony defects were created on the anterior glenoid rim, and the coracoid process was transferred flush with the glenoid by the traditional and congruent-arc techniques using two half-threaded screws. A load was applied to the greater tuberosity toward the center of the glenoid, and a tensile force (20 N) was applied to the coracoid tip along the direction of the conjoint tendon. The distribution patterns of the von Mises stress in the traditional and congruent-arc Latarjet techniques were compared. RESULTS: The mean von Mises on the graft was significantly greater for the TL technique than for the CAL. While the von Mises stress was greater in the distal medial part of the graft in the TL models, a higher stress concentration was observed in the distal lateral edge of the coracoid graft in the CAL models. The proximal medial part of the graft exhibited significantly lower von Mises stress than the distal medial part when compared according to technique, defect size, and arm position. Increasing the glenoid defect from 25 to 35% resulted in a significant increase in stress on the lateral side of the graft in both models. CONCLUSION: The stress distribution patterns and stress magnitude of the coracoid grafts differed according to the procedure. Due to placing less stress on the proximal-medial part of the graft, the CAL technique may lead to insufficient stimulation for bone formation at the graft-glenoid interface, resulting in a higher incidence of graft osteolysis. Clinical relevance The CAL technique may lead to a higher incidence of graft osteolysis. LEVEL OF EVIDENCE: Basic Science Study; Computer Modeling.

The base of coracoid process as a reference for glenoid reconstruction in primary or revision reverse shoulder arthroplasty: CT-based anatomical study.

INTRODUCTION: Joint replacement surgery as a treatment for glenohumeral arthritis with glenoid bone loss is challenging. The aim of this study is to offer an anatomical orientation for glenoid reconstruction. METHODS: In this study, we measured size, inclination and version of the glenoid surface, as well as the distance between the articular line of the glenoid, base of the coracoid process, and acromion using computer tomographic (CT) imaging of 131 study participants aged 19-88 years in the period of 2010-2013. RESULTS: We measured a mean distance of 6.5 ± 0.2 mm from the glenoid articular line to the base of the coracoid process in the transverse CT plane. Body height has shown no significant impact on the glenoid morphology. We observed significant differences between males and females: The glenoid appeared to be located 5.2 ± 0.9 mm higher and the humeral head was 4.5 ± 0.7 mm larger in male subjects compared with females (r = .699; p < .01). CONCLUSION: In our study, the base of the coracoid offers an anatomical reference during reconstruction of the glenoid in primary and revision shoulder arthroplasty. As only 2D-CT imaging allows for accurate assessment of glenoid bone defects, we consider conventional X-ray imaging insufficient for proper preoperative planning before shoulder arthroplasty. LEVEL OF EVIDENCE: III.

Transfer of the coracoid and conjoined tendon for failed, unstable, short clavicle following excessive outer clavicle resection.

Nineteen patients presented with an unsightly deformity of the shoulder, pain or discomfort at the medial scapular border, pseudo nonparalytic scapular winging, and thoracic outlet symptoms after excessive resection of the clavicle for either complete acromioclavicular separation or displaced fracture of the outer clavicle, which allows the scapula and shoulder to rotate anteriorly and inferiorly on the chest creating traction on the medial scapular muscles and the brachial plexus resulting in pseudo nonparalytic winging and thoracic outlet symptoms. RESULTS: All underwent transfer of the coracoid process with the attached conjoined tendon to the end of the clavicle, restoring length and alignment. Eighteen patients were evaluated at a mean of 13.3 years. Seventeen had resolution of symptoms, restored alignment of the clavicle with the shoulder, improved appearance, healed transfer, and were pleased with the outcome. One patient was lost to follow-up but was considered a failure at his last visit. In a second patient, the transfer healed in a tilted position and the patient was dissatisfied with the appearance but otherwise had resolution of his symptoms. The mean American Shoulder and Elbow Surgeons Outcome Score improved from 53.2 preoperatively to 87.4 postoperatively (P < .02). CONCLUSION: This is the first report of using this transfer to restore length and alignment of an excessively short, unstable clavicle. The transfer succeeded in improving the appearance and symptoms in this complication of an excessively short, unstable clavicle.

Anatomy and Correlation of the Coracoid Process and Coracoclavicular Ligament Based on Three-Dimensional Computed Tomography Reconstruction and Magnetic Resonance Imaging.

BACKGROUND The anatomy of the coracoid process and coracoclavicular (CC) ligament have been described and the correlation between them has been assessed based on 3-dimensional computed tomography (CT) reconstruction and magnetic resonance imaging (MRI), which provide a guide for coracoclavicular ligament reconstruction. MATERIAL AND METHODS Data were collected from 300 patients who underwent both CT and MRI of the shoulder joint from January 2017 to January 2019 at the Jiang'an Hospital of Traditional Chinese Medicine. The coracoid process was observed and classified and parameters of the CC ligament were measured according to different corneal types. All of the statistics were collected and classified by 2 radiologists, and average values were determined.Measurements of segments were taken as follows: ab - In the coronal plane, the length of the CC ligament from the central point of the CC ligament at the clavicular attachment to the CC ligament at the center of the CC attachment); ac - The distance from the center point of the CC ligament at the supraclavicular attachment to the acromioclavicular joint; de - In the sagittal plane, the length of the CC ligament from the center of the clavicular attachment to the coracoid attachment point; fg - The maximum diameter of the CC ligament at the anterior and posterior margins of the clavicle attachment; hi - The largest diameter of the CC ligament at the anterior and posterior edge of the coracoid process attachment; dj - The distance of the coracoclavicular ligament from the center point of the coracoid process attachment to the coracoid process tip; kl - The distance in the supraclavicular plane from the coracoclavicular ligament to the subcoracoid process. RESULTS The analysis showed that there are 5 types of coracoid process: gourd (31%), short rod (20%), long rod (22.3%), wedge (10.3%), and water drop (6.3%). There were statistically significant differences between the lengths of the ac and hi segments in the among the wedge and gourd-type and the short rod and water drop-type coracoid processes. There were statistically significant differences between the lengths of the ab, de, and fg segments in the short rod, gourd, and long rod-type coracoid processes. There were statistically significant differences between the lengths of the ac, fg, hi, dj, and kl segments in the water drop, gourd, and long rod-type coracoid processes. CONCLUSIONS The present study indicated that measurement of the CC ligament and the different shapes of the coracoid process provide an anatomical basis for the diagnosis and treatment of shoulder diseases and the data can be used to improve the safety of CC ligament reconstruction.

A guideline for screw fixation of coracoid process base fracture by 3D simulation.

BACKGROUND: Fractures of the base of the coracoid process are relatively rare, but an increasing number of studies have reported using screws to fix coracoid process base fractures. This study was performed to simulate the surgical procedure and obtain the ideal diameter, length, insertion point and angle of the screw from a 3-D axial perspective in Chinese patients. METHODS: We randomly collected right scapula computed tomography (CT) scans from 100 adults. DICOM-formatted CT scan images were imported into Mimics software. A 3D digital model of the right scapula was established. Two virtual cylinders representing two screws were placed from the top of the coracoid process to the neck of the scapula and across the base of the coracoid process to fix the base of the coracoid process. The largest secure diameters and lengths of the virtual screws were measured. The positions of the insertion points and the directions of the screws were also examined. RESULTS: The screw insertion safe zone can exhibit an irregular fusiform shape according to the reconstructed scapula model. The mean maximum diameters of the medial and lateral screws were 7.08 ± 1.19 mm and 7.34 ± 1.11 mm, respectively. The mean maximum lengths of the medial and lateral screws were 43.11 ± 6.31 mm and 48.16 ± 6.94 mm, respectively. A screw insertion corridor with a diameter of at least 4.5 mm was found in all patients. We found sex-dependent differences in the mean maximum diameters and maximum lengths of the two screws. The positions of the two insertion points were statistically different across sexes. CONCLUSIONS: The study provides a valuable guideline for determining the largest secure corridor for two screws in fixing a fracture at the base of the coracoid process. For ideal screw placement, we suggest individualised preoperative 3D reconstruction simulations. Further biomechanical studies are needed to verify the function of the screws.

The Shoulder Trans-pectoralis Arthroscopic Portal Is a Safe Approach to the Arthroscopic Latarjet Procedure: A Cadaveric Analysis.

PURPOSE: To assess the proximity of neurovascular structures in a layered approach during medial portal placement and determine standardized measurements for establishing a portal medial to the coracoid used in arthroscopic Latarjet-type procedures. METHODS: Twelve shoulders (6 right and 6 left) in 6 fresh frozen cadaveric torsos were mounted in the modified beach-chair position. A standard posterior portal and 3 anterior portals-central, lateral, and medial-were used. A long spinal needle was placed along the path of the medial portal to the lateral tip of the coracoid, superficial to the conjoined tendon and pectoralis minor. A second long spinal needle was directed toward the medial base of the coracoid, penetrating the pectoralis minor. Superficial and deep plane dissections were performed, and distances to surrounding neurovascular structures were recorded. RESULTS: In the superficial plane, the cephalic vein and lateral pectoral nerve were located a mean distance (± standard deviation) of 4.6 ± 1.9 mm and 9.4 ± 2.6 mm from the spinal needle, respectively. In the deep plane, the axillary nerve was 24.9 ± 7.4 mm from the needle; the lateral cord of the brachial plexus, 25.5 ± 8.1 mm; the axillary artery, 34.1 ± 6.0 mm; and the musculocutaneous nerve, 42.2 ± 9.2 mm. The portal was consistently established 45.0 to 50.0 mm distal and 30.0 to 35.0 mm medial to the coracoid, which was a minimum distance of 10 mm to the lateral pectoral nerve. CONCLUSIONS: In a cadaveric model, the creation of a medial trans-pectoralis major portal used in the arthroscopic Bankart-Bristow-Latarjet procedure can avoid compromise of vital neurovascular structures, alleviating concerns of creating a portal medial to the coracoid. Portal placement 45.0 to 50.0 mm distal and 30.0 to 35.0 mm medial to the palpable tip of the coracoid process may be a safe approach to perform the arthroscopic Bankart-Bristow-Latarjet procedure. CLINICAL RELEVANCE: Creation of a portal medial to the level of the coracoid may pose a risk to neurovascular structures. This cadaveric study establishes a working zone for medial trans-pectoralis portal placement, which avoids vital neurovascular structures, and provides standardized measurements for establishing this portal for use in the arthroscopic Bankart-Bristow-Latarjet procedure.

Long-term stability of coracoclavicular suture fixation for acute acromioclavicular joint separation.

PURPOSE: The optimal (SBJI) surgical treatment for acute acromioclavicular (AC) joint disruption remains controversial. What is being presented is the long-term functional outcomes of a double cross-looped coracoclavicular (CC) suture technique with the intention of restoring both anteroposterior and superior displacement of the clavicle. METHODS: Between 2007 and 2016, 81 patients underwent surgical reconstruction for acute acromioclavicular joint (AC) disruption in two orthopaedic centers. Two patients died for reasons unrelated to the treatment, and seven missed the final follow-up appointment, leaving 72 patients (67 males; 5 females; age 37 ± 12.4; range 15-64 years) for clinical and radiological assessments. All cases were classified according to the Rockwood classification as type III (n = 34), IV (n = 14) or V (n = 24). The dislocation was repaired with double cross-looped CC fixation using four Ethibond sutures passing underneath the coracoid and through a 4.5 mm drill hole in the clavicle in opposing directions to control both anteroposterior and vertical displacement. Radiological investigation preoperatively and at the last follow-up included anteroposterior and/or Zanca views, axillary or Alexander views, and comparative stress radiography of both AC joints. Patients were evaluated clinically with the Constant-Murley score (CMS) and Acromio Clavicular Joint Instability Score (ACJIS). Loss of reduction, subluxation, CC ligament ossification, post-traumatic arthritis, and peri-implant fractures were also recorded. RESULTS: Seventy-two patients were available for the last clinical and radiological evaluations. At a median follow-up period of 6.3 ± 2.1 years (range 3-12 years), the CMS and ACJIS were 92.1 ± 7.2 (range 60-100 points) and 90.4 ± 8.6 (range 45-100 points), respectively. Complications included 9 (12.5%) patients with slight loss of reduction, 2 (1.7%) with dislocation recurrence, 1 (1.3%) with superficial infection, 1 (1.3%) with a fracture of the lateral end of the clavicle, and 2 (1.7%) with persistent tenderness in the AC joint. The incidence of periarticular ossification was 22.4% and did not affect the final outcome. CONCLUSIONS: This technique represents an effective and low-cost treatment for acute AC joint separations. LEVEL OF EVIDENCE: IV.

All arthroscopic coracoclavicular button fixation is efficient for Neer type II distal clavicle fractures.

PURPOSE: Neer type II distal clavicle fractures are associated with a high rate of non-union or malunion due to impaired coracoclavicular ligament stability. The purpose of this study was to assess the clinical and radiological outcomes of arthroscopically assisted indirect osteosynthesis for type II distal clavicle fractures using a cortical suture button device. METHODS: Seventeen patients Neer type II fractures of the distal clavicle were treated surgically using cortical suture button fixation between 2012 and 2017. The clinical and radiological results were assessed using the American Shoulder and Elbow Surgeons Shoulder Score (ASES), Constant-Murley score and visual analogue scale (VAS) score. RESULTS: Anatomic reduction and bone healing were achieved in all patients at the final follow-up. The median age of the patients was 31 years (range 19-57). The mean follow-up was 25.9 months (range 14-64). The average delay before surgery was 2 days (range 1-4). At the final follow-up, the mean ASES, Constant-Murley score and VAS score were 92.6 ± 3.2 (range 84.9-96.6), 96.2 ± 2.4 (range 92-100) and 0.47 ± 0.51 (range 0-1), respectively. All patients were able to resume work as well as sport activities. The postoperative complications included two coracoid process fractures, and none of the patients required additional surgery related to the index procedure. CONCLUSION: All arthroscopic coracoclavicular button fixation of Neer type II distal clavicle fractures would provide sufficient stability and union with satisfactory radiological and clinical outcomes. This arthroscopic fixation technique would be more efficient than other osteosynthesis methods because it is a minimally invasive surgery with a low complication rate. LEVEL OF EVIDENCE: III.