Freehand application substantially improved cortical bone placement, in comparison to the outcomes obtained using pre-defined, adjusted angles. The findings of this study question the usefulness of a universal orientation strategy and propose that a technique emphasizing maximum cortical engagement (freehand) might help prevent aseptic loosening.Cortical bone seating benefited considerably from the freehand technique, in contrast to the prescribed and adjusted angles approach. These research findings raise concerns regarding the suitability of a one-size-fits-all orientation protocol, indicating that a method emphasizing complete cortical contact (freehand) might lessen the likelihood of aseptic loosening.Acromial form plays a crucial role in the development of the pathophysiological mechanisms underlying subacromial impingement syndrome. Using radiology, acromial morphology can be assessed via three techniques: the Bigliani technique, the modified Epstein technique, and the determination of the acromial angle. others signal Despite this, their reliability has not been compared across a single study using standardized radiographs. Currently, despite widespread global use, acromial morphology evaluation lacks validation. A key objective of this investigation was to evaluate the consistency of three recognized classifications against that of the innovative Copenhagen Acromial Curve classification.Over two separate sessions, one month apart, three experienced clinicians rated 102 standardized supraspinatus outlet view radiographs, applying four different classification methods to each. Measurement identification was kept hidden. In the anticipated kappa (Considering the intraclass correlation coefficient (ICC) exceeding 0.7 (+/-0.15), a sample size of 87 radiographs was deemed necessary.The Bigliani classification's scores for interrater and intrarater reliability were situated within the range of fair to good, showing values between 0.32 and 0.41 for interrater agreement and 0.26 to 0.62 for intrarater agreement. The modified Epstein classification demonstrated a reasonable degree of inter- and intra-rater reliability, with the coefficients for inter-rater agreement falling between 0.24 and 0.69 and those for intra-rater agreement between 0.57 and 0.63. Interrater and intrarater reliability for acromial angle classification were moderately to highly consistent, demonstrating coefficients between 0.53 and 0.60, and 0.59 and 0.72, respectively. The novel Copenhagen Acromial Curve classification showed a moderate to good degree of consistency among raters (inter-rater reliability, ICC values ranging from 0.66 to 0.71) and within a single rater (intra-rater reliability, ICC values ranging from 0.75 to 0.78).The Copenhagen Acromial Curve classification method was the only one to produce an ICC score higher than 0.7. The Bigliani classification, while prevalent, demonstrated the least satisfactory degree of reliability. The Copenhagen Acromial Curve classification distinguishes itself by providing numerical data, unlike the three other classification methods. Further research could potentially employ this data to define thresholds for treatment stratification.Sentences, as a list, are contained within this JSON schema. Concerning reliability, the widely recognized Bigliani classification performed poorly. Unlike the other three classification methods, the Copenhagen Acromial Curve classification yields numerical data. The implications of this research extend to future studies, allowing for the development of cut-off points in the stratification of treatments.Shoulder arthroplasty's success relies on the restoration of the glenoid joint line to facilitate proper implant positioning and function. In shoulder arthroplasty, whether primary or revision, medialization of the glenohumeral joint line, often a consequence of glenoid bone loss, is frequently observed, with the pattern of loss varying according to the particular pathology involved. Utilizing 3D planning software, surgeons have streamlined the preoperative planning process for complex glenoid deformities. Limited research documents a reliable three-dimensional approach for pre-operative determination of the glenoid joint line.Using 3D segmented models of healthy scapulae, the objective of this study is to establish a set of reliable scapular landmarks as reference points for evaluating the premorbid glenoid joint line.A retrospective search of our institutional surgical database yielded 79 patients (mean age 35.1 years, 58 male, 21 female), suitable for primary stabilization procedures, whose bilateral computed tomography scans were then identified. Mimics 240 software (Materialise, Leuven, Belgium) was utilized to generate 3D models of the contralateral, healthy scapulae from CT scan segmentations. Using 3-Matic 160 software from Materialise (Leuven, Belgium), anatomical landmarks were pinpointed. For each scapula, the distance from identified landmarks to a sagittal plane established at the glenoid's deepest point was documented, alongside an evaluation of each landmark's reliability. Inter- and intra-observer reliabilities were also examined, employing intraclass correlation coefficients (ICCs).Statistically significant results were observed at four landmarks: the scapular notch (SN), the center of the coracoid (CC), a point along the scapula's most medial border, in line with the scapular spine (TS), and the acromion's outermost point (AL). The joint line's mean (standard deviation) measurements from SN, CC, TS, and AL were 2836297 mm (1166207 mm), 2972446 mm (1166207 mm), 1075281 mm (1166207 mm) and 2836297 mm (1166207 mm), respectively. Inter-observer reliability analysis, specifically for SN, TS, and AL, demonstrated highly concordant results, with intra-class correlation coefficients (ICC) of 0.966, 0.997, and 0.944, respectively; however, for CC, the ICC of 0.728 indicated a moderately aligned assessment.Preoperative estimations of joint line medialization and subsequent restoration planning are aided by the results of this investigation. Reference points comprising a set of reliable landmarks can aid in preoperatively estimating the premorbid glenoid joint line.This study's results provide assistance in pre-operative estimation of joint line medialization and the subsequent reconstruction planning. To ascertain the premorbid glenoid joint line preoperatively, a collection of dependable landmarks can serve as guides.The current study sought to evaluate the indicators for the condition of the contralateral rotator cuff in patients undergoing arthroscopic rotator cuff repair for symptomatic rotator cuff tears.Following ARCR, 104 patients, whose mean age was 647 years (age range 40-83), underwent preoperative ultrasonography to determine the presence of a contralateral RCT. In addition to other preoperative data, patients' occupations and involvement in sports were also considered.Surgical intervention on the shoulder resulted in a mean follow-up period of 250 months, with a minimum follow-up of 12 months and a maximum of 72 months. In 40 of the 104 patients (representing 38.5 percent), a contralateral shoulder RCT was observed. Among the RCT group before surgery, contralateral shoulder pain was present in 16 patients (40%), whereas the non-tear group showed 15 patients (231%) experiencing the same. Within the 31 patients reporting shoulder pain, 17 individuals had a poor prognosis, constituting 54.8% of the sample size. A statistically significant difference was found between the active and sedentary groups in the RCT, with eight (308%) patients in the active group exhibiting a poor prognosis, compared to none in the sedentary group.The minuscule figure of .02, while seemingly inconsequential, carries considerable weight. Conversely, within the non-tear cohort, a poor prognosis manifested in four patients (105%) of the active group, a disparity not statistically significant when compared to the five patients (192%) observed in the sedentary group.=.33).For the active group in ARCR, a detrimental influence on the prognosis of the contralateral shoulder is associated with participation in RCTs.RCT participation for patients in the active group is associated with a higher likelihood of poor outcomes in the contralateral shoulder within the ARCR context.Poor outcomes following anatomic total shoulder arthroplasty (aTSA) are frequently observed in cases of posterior humeral head (HH) subluxation, yet the precise role of glenoid reaming in achieving appropriate HH alignment and whether such alignment remains stable over time is unclear. The research sought to examine the association between humeral head alignment and the scapula after a total shoulder arthroplasty (TSA). This investigation aimed to isolate the anatomical and surgical factors pertinent to humeral head realignment, glenoid loosening, and eventual clinical results.Three-dimensional scapulohumeral alignment was evaluated using three-dimensional reconstructions from computed tomography scans of 23 patients, pre-aTSA (T0), at 2 years post-aTSA (T1), and at 5 years post-aTSA (T2). Using the HH diameter as a reference, the AP, SI, and medial-lateral distances between the HH center and the scapula defined the scapulohumeral subluxation index. At time points T0 and T1, the glenoid version and inclination were assessed. Two-dimensional computed tomography scans were taken to evaluate central peg osteolysis, rotator cuff fatty infiltration, and vault perforation. The relative constant score, obtained at T2, reflected the clinical outcome.Glenoid correction showed a robust correlation with the humeral head's anterior-posterior and superior-inferior positioning (r=0.733 and r=0.797, respectively). Retroversion correction, at each degree, caused a 9% decrease in the AP scapulohumeral subluxation index, moving the index anteriorly. Each degree of correction in upward inclination produced a 10% displacement in the upward direction. Post-procedure, the proximal region saw a gradual decline, resulting in a mean difference [MD] of -3%.Anterior (MD, 2%), with a value of only 0.019.Lateral measurements (0.025 mm) and medial measurements (3 mm) were also taken.