Acromion Research Articles

Evaluation of two scoring systems assessing the epiphyseal union at shoulder joint as predictors of chronological age among a sample of Egyptians.

Age estimation has extensive medicolegal implications in civil and criminal identification. Despite the surge in adopting radiological investigations to assess developmental bony changes, the shoulder joint is understudied. A cross-sectional study was conducted, enrolling 283 shoulder radiographs of Egyptians, investigating the reliability of two previously established scores as predictors of chronological age using the epiphyseal maturation of proximal humerus and acromion process. Epiphyseal union of proximal humerus commenced at age of 16.1-17 and completed around 21, while complete acromial union was observed around the age of 20.8. Females significantly preceded males and showed lower mean total Scores A and B at different maturation stages. There was a significant strong positive correlation between the chronological age and the epiphyseal maturation of humerus, acromion and total shoulder scores with correlation coefficients between 0.84 and 0.9. The receiver operating characteristic curves showed significant discriminating power of the total shoulder Scores A and B as predictors of the ages of 14 and 16, with area under curves above 0.9, minimal accuracy of 96.5% and p values of 0.001. Six proposed models were established where the model "age=0.318+(0.388) total shoulder Score A+(2.842) total shoulder Score B+1.931 (sex)" showed the best significant prediction power of radiographic evaluation of epiphyseal maturation in the proximal humerus and acromion in estimating the ages between 8 and around 20years (R2 of 0.812). Applying this model to assess the chronological age, especially if the results from the hand and teeth are inconclusive, is promising.

Drop set versus traditional strength training protocols equated in volume on muscle thickness in women

Purpose: The aim of this study was to investigate the effects of two strength training protocols, equated in volume, on the elbow flexor muscle thickness (MT) in women. Methods: Twenty-seven women (mean±sd, age 21.89±2.85 years; stature,167.82±5.90 cm; body mass 63.01±7.20 kg; estimate of body fat mass, 19.19±2.88%) were divided in three experimental groups: a drop-set (DS), a traditional (TR), and a control group (CG). The CG maintained regular strength training without perform any upper body exercises. The DS group performed a dumbbell biceps curl for two days/week, 12 weeks, 4 sets of 3 blocks of 10 repetitions at 75%, 55%, and 35% of their 1 Repetition Maximum (RM), and 8 sets of 11 repetitions at 75% of the 1RM for the TR protocol. Rest interval between sets was 120 seconds. The MT was acquired in the anterior face of both upper arms at 50% and 60% of the distance between the lateral epicondyle of the humerus and the acromial process of the scapula before (T0) and after the 24 training sessions (T1). Results: There was a significant increase in all MT measurements between T0 and T1for the training groups(p<0.05). In addition, significantly higher values of MT were found in the training groups compared to the control group for all local measurements in T1 (p<0.05). No significant differences were found between training the groups for MT. Conclusion: It appears that both training groups (DS and TR), were effective in promoting MT of the elbow flexors muscles of young women with no differences between training strategies. Keywords: Hypertrophy, Ultrasonography, Training method, Female

Potential Utility of SPECT/CT for Early Detection of Scapular Stress Reaction Following Reverse Total Shoulder Arthroplasty.

Scapular stress fracture (SSF) after reverse total shoulder arthroplasty is a unique and common complication that may have negative impact for long-term outcomes. Scapular stress reaction (SSR), characterized by pain and tenderness without radiographic evidence of fracture, can be precursor of SSF. We believe that early detection using SPECT/CT with proper management for SSRs including acromion, scapular spine, and coracoid process is crucial for better prognosis without additional complications by preventing SSFs. Therefore, we present 3 typical cases with SSR following reverse total shoulder arthroplasty with the findings of SPECT/CT.

Osteology and relationships of the Late Triassic giant dicynodont Lisowicia

Abstract Unexpectedly abundant remains of herbivorous therapsids in the Late Triassic strata of southern Poland have significantly supplemented knowledge of their evolution. The skeletal morphology of the Late Norian (or Rhaetian) dicynodont Lisowicia bojani supports its close relationship to the Carnian Woznikella, both known from the Polish part of the Germanic Basin. Three evolutionary lineages of dicynodonts—Laurasian–Gondwanan Rhadiodromus klimovi → Jachaleria candelariensis lineage, Laurasian lineage Shaanbeikannemeyeria xilougouensis → Lisowicia bojani, and the Gondwanan lineage Kannemeyeria simocephalus → Dinodontosaurus brevirostris—are distinguished based on characters of cranial and postcranial elements. In the lineages characterized by the parietal oval in cross-section and the two distinct articulations on the sternum, there is a tendency to exclude the frontal from the orbital margin and to reduce the number of sacral vertebrae. In the lineage with the parietal narrow and triangular in cross-section, the frontal forms part of the orbit margin, there is a single joint on the sternum, and there is a tendency towards flattening the skull roof. In both lineages the shoulder girdle is convergently modified, the acromion process decreased, and joints on the sternum moved posteriorly.

Percutaneous Cannulation of the Axillary Artery: Does the Position of the Brachial Plexus Correlate With Bony Landmarks That Could Be Used to Reduce the Risk of Complications?

Introduction Endovascular surgery is an innovative way of carrying out procedures such as transcatheter aortic valve insertion where the femoral artery is commonly used as an access point. Conditions like peripheral arterial disease can make endovascular procedureschallenging when atherosclerotic plaques compromise the integrity of lower limb vessels. An alternativeaccess point for these patients isrequired. Access through the axillary artery has been proposed; however, the close proximity of the brachial plexus introduces a risk of neural complications. This study aims to find an anatomical or bony landmark(s) to help identify an area of safety on the axillary artery that can be used to gain access. Materials and methods Nine cadavers were used in the study and five parameters were measured using the acromion and coracoid processes as bony landmarks. The 1st parameter measured the distance between the acromion and the coracoid process. The 2nd parameter was the diameter of the axillary artery taken at a plane extending from the acromion to the coracoid process - now defined as the coracoacromial plane. The 3rd measurement was the distance between the coracoid process and the midpoint of the axillary artery diameter taken at the above plane; it is proposed this will form a safe point on the axillary artery. The 4th parameter measured was the distance between the safe point on the axillary artery and the median nerve. The 5th parameter was the distance between the safe point and the thoracoacromial trunk. Measurements were taken using digital callipers and were recorded for both sides of the cadaver except for one. Using the data from the measurements, an area of safety was calculated and statistical analysis was carried out using Student's t-test and Pearson's correlation to look for significant differences between the left and right sides. Results The mean distance from the safe point of the axillary artery to the median nerve was 23.25 mm on the left and 27.10 mm on the right. The p-value was 0.7, which indicated no significant differences between both sides. The mean distance between the safe point and the thoracoacromial trunk was 11.31 mm on the left and 13.21 mm on the right. The p-value was 0.24, indicating no significant differences between both sides. The mean area of safety was larger on the right side with an area of 184.37 mm and smaller on the left side with an area of 158.93 mm. The p-value was 0.62, which indicated no significant differences between both sides. There was no clear relationship between the distance from the acromion to the coracoid process compared to the distance between the acromion and a defined safe point on the axillary artery. This was confirmed using a Pearson's correlation test, which resulted in a p-value of 0.53 on the left and 0.93 on the right. These values were above the critical value, suggesting no correlation. Conclusion The acromion and the coracoid process are important bony landmarks that can be used to define the coracoacromial plane that traverses the axillary artery whereby avoiding the cords of the brachial plexus, the median nerve as well as the thoracoacromial trunk. Implementing this approach to define a safe vascular access point on the axillary artery could minimise complications like brachial plexus injuries. Further studies on a larger sample size using radiological methods may need to be carried out to help increase confidence in these preliminary cadaveric findings.

Frontal Plane Body Posture as a Predictor of Musculoskeletal Injuries in Amateur Athletes: A Comprehensive Study of 89 Participants Over 12 Months.

BACKGROUND This study aimed to evaluate frontal plane body posture parameters as injury risk factors during physical activity in the previous 12 months. MATERIAL AND METHODS The study sample consisted of 41 males aged 21.3±1.1 years old and 48 females aged 20.8±0.6. To evaluate body posture, we assessed differences in the height of the acromion process (SSA) and differences in the height of the shoulder blades (LSAS), differences in the distance of the lower angles of the shoulder blades and spine (LSPD), differences in the height of the posterior superior iliac spine (PSIS), and the maximum deflection of spinous process line from the line C7-S1 (PTA). The Injury History Questionnaire was used for injury data collection from the previous 12 months. The parameters were assessed for their ability to distinguish between injured and non-injured individuals using the receiver operating characteristic (ROC) method. RESULTS The results suggest that LSPD is a significantly (P=0.028) better predictor of injury than other body posture parameters. The cut-off points for risk of injury based on the assessed body posture parameters demonstrated a diagnostic accuracy higher than chance, except for LSAS and PTA (AUC >0.5). In addition, there were no sex differences in the predictive potential of detecting injuries between males and females. CONCLUSIONS The LSPD has the greatest predictive value for musculoskeletal injuries. Our results suggest that body posture parameters, irrespective of sex, independently influence injury risk, emphasizing the need for preventive strategies targeting athletes' trunk and shoulder regions.

STRESS-DEFORMED STATE OF THE ACROMIOCLAVICULAR JOINT IN CASE OF DAMAGE TO THE UPPER ACROMIOCLAVICULAR LIGAMENT SUPERIOR AND VARIOUS METHODS OF FIXATION

During the operative stabilization of the acromial end of the clavicle (AEC) for its dislocation, there are two ways: clavicle – beaklike process, clavicle – acromial process. Fixation of the AEC to the acromial process of the scapula is a priority. Competing metal structures are the hook plate and the Weber method. The significant disadvantages of using the Weber method of fixation are the migration of the tips and the violation of their integrity andthe wire. Objective. To conduct a comparative analysis of the fixation of the acromial end of the clavicle according to Weber, hook plate and the proposed construction, by studying the stressed-deformed state of the clavicular-acromial joint in case of damage to the lig. acromioclavicular superior and various methods of fixation. Methods. A finite-element model of the clavicular-acromial joint was constructed. Damage to the ligaments was modeled. claviculo-acoacromiale superior, as well as fixation of AEC in three ways: according to Weber, hook plate and the proposed construction. Results. The best results, from the point of view of reducing the level of stresses in intact ligaments, are provided by fixation of the AEC according to Weber, but its use leadsto an increase in the level of stresses on the AEC and the acromial process of the scapula, which can cause destruction of the latter. The hinge-type fixator provides the best stress distribution, both in the bony elements of the model and in intact ligaments. The hook plate holder occupies an average position,both in terms of the level of stress and the magnitude of the relative deformations in the ligaments. Conclusions. Weber fixation provides the best results for reducing the level of stresses and relative strains in the intact ligaments, but leads to a several-fold increase in the level of stresses on the AEC and acromial process of the scapula. The hook plate holder occupies an average position, both in terms of the stress level and the magnitude of the relativedeformations in the ligaments. The proposed design provides the best stress distribution, both in the bony elements of the model and in the intact ligaments.

Inter-observer reliability and anatomical landmarks for arm circumference to determine cuff size for blood pressure measurement.

Accurate arm circumference (AC) measurement is required for accurate blood pressure (BP) readings. Standards stipulate measuring arm circumference at the midpoint between the acromion process (AP) and the olecranon process. However, which part of the AP to use is not stipulated. Furthermore, BP is measured sitting but arm circumference is measured standing. We sought to understand how landmarking during AC measurement and body position affect cuff size selection. Two variations in measurement procedure were studied. First, AC was measured at the top of the acromion (TOA) and compared to the spine of the acromion (SOA). Second, standing versus seated measurements using each landmark were compared. AC was measured to the nearest 0.1cm at the mid-point of the upper arm by two independent observers, blinded from each other's measurements. In 51 participants, the mean (±SD) mid-AC measurement using the anchoring landmarks TOA and SOA in the standing position were 32.4cm (±6.18) and 32.1cm (±6.07), respectively (mean difference of 0.3cm). In the seated position, mean arm circumference was 32.2(±6.10) using TOA and 31.1(±6.03) using SOA (mean difference 1.1cm). Kappa agreement for cuff selection in the standing position between TOA and SOA was 0.94 (p<0.001). The landmark on the acromion process can change the cuff selection in a small percentage of cases. The overall impact of this landmark selection is small. However, standardizing landmark selection and body position for AC measurement could further reduce variability in cuff size selection during BP measurement and validation studies.

The effect of staged versus rapid immersion on the cardio-respiratory components of the cold-shock response

Drowning is one of the leading causes of accidental death. Sudden cold-water immersion (CWI) leads to the stimulation of cutaneous cold receptors causing the cold-shock response (CSR) which includes a gasp, hyperventilation, and tachycardia for several minutes. Only one study has investigated staged CWI (Hayward and French, 1989, Av Space Env Med, 60, 1163-1165) and found a reduction in minute ventilation (V̇E) and respiratory frequency (fB) occurred when immersed to the waist for 30 s followed by to the shoulders. However, it is unclear whether a staged entry with a longer or shorter period at the waist would elicit a greater or lesser CSR. Thus, the aim of this study is to establish whether a staged immersion with a longer period immersed to the waist would attenuate the initial cardio-respiratory responses associated with CWI, when compared with rapid immersion. Ethical approval was gained from the University of Portsmouth Science Faculty Research Ethics Committee (SHFEC 2020-070). Seven male participants completed two, 5 min immersions that occurred at the same time of day (± 2 h) to avoid circadian variation in internal body temperature: a staged immersion (immersion to the iliac crest for 2 min prior to immersion to the acromion process); a rapid immersion (immersion to the acromion process for 5 min). Participants were lowered into stirred water (15°C) at a rate of 4 s to the waist, 4 s to the shoulder. Inspiratory and expiratory data were collected using a ventilatory turbine module and Douglas bags, respectively, whilst heart rate data was collected using a three-lead ECG. Variables were analysed over the first 30 s of immersion by a one-way ANOVA and a Tukey post hoc test. Effect sizes were calculated using Cohen’s d. Staged immersion to the waist resulted in a significantly lower fB (P &lt; 0.05; d = 1.54) and V ̇E (P &lt; 0.01; d = 1.96) over the first 30 s epoch, when compared to rapid immersion. Staged immersion to the shoulders resulted in a lower ventilatory equivalent of oxygen (P &lt; 0.005; d = 1.95). There was no difference in heart rate between immersions. A staged immersion to the waist resulted in a 36.2% lower V̇E and 29.4% lower fB, potentially due to fewer cutaneous cold receptors being stimulated. This reduces the potential to aspirate water due to a lower ventilatory drive, therefore, could reduce drowning incidence attributed to the CSR.

The method for fixation of dislocations of the acromial end of the clavicle according to Weber: disadvantages and their factors

Background. Dislocations of the acromial end of the clavicle are quite common traumatic injuries of the locomotor apparatus and, according to various authors, account for 3 to 26.1 % of dislocations of other locations and about 10 % in the structure of acute injuries of the shoulder girdle, ranking third after dislocated shoulders and forearms. They occur mainly in young men of the most working age, which determines the social significance of this injury. Stabilization of the acromial end of the clavicle, as a rule, was ensured by fixation according to Weber and the use of a hook plate. The purpose of the study: to determine the shortcomings and strength characteristics of the fastening elements in the fixation of the acromial end of the clavicle according to Weber. Materials and methods. From 2015 to 2020, a retrospective analysis was performed of treatment outcomes in 57 patients who underwent surgery for dislocation of the acromial end of the clavicle and Weber fixation. Calculations of the strength of fixation of the acromial end of the clavicle with a cerclage wire and spikes in case of its dislocation were carried out in the biomechanics laboratory of the State Institution “Sytenko Institute of Spine and Joint Pathology of the National Academy of Medical Sciences of Ukraine”. Results. According to the results of clinical studies, a violation of the integrity of the wire and spikes was observed in 10.5 % of cases, destruction of the acromion process and acromial end of the clavicle — in 19.3 %, migration of the spikes — in 12.3 %. Results of the experimental study show that these shortcomings are clearly correlated with the mechanical properties of the wire and spikes. Conclusions. The factors for unsatisfactory results of surgical treatment for dislocations of the acromial end of the clavicle when using Weber’s method are the violation of the integrity of the wire and spikes, the destruction of the acromion process and the acromial end of the clavicle, the migration of the spikes, which are caused by the mechanical properties of these structures.

Epithelioid hemangioma of the acromion causing shoulder pain: a case report.

Epithelioid hemangioma of bone is a rare benign vascular tumor. Because of the locally destructive clinical presentation and the presence of atypical histologic features with increased mitotic activity and necrosis, it is often misdiagnosed as low-grade malignant epithelioid hemangioendothelioma or high-grade malignant epithelioid angiosarcoma. Correct diagnosis through imaging studies and histopathological examination is mandatory to determine the appropriate course of treatment, as the prognosis differs from that of other malignant hemangioma tumors. A 69-year-old male who presented with intractable shoulder pain caused by epithelioid hemangioma in the acromion of the scapula was treated with tumor curettage. This paper reports a good result with a review of the relevant literature.

A clinical case of scapula fragment fracture with dislocation of fragments

Relevance. According to statistical data, fractures of the scapula are quite rare, accounting for approximately 3-5% of all shoulder girdle fractures and less than 1% of the total number of fractures. Because of the high-energy nature of scapula fractures, 80% to 95% of cases are associated with additional traumatic injuries. The aim: to analyze the technique of performing surgical intervention in a fragment fracture of the right scapula with displacement of the fragments on the example of a clinical case. Object and methods. Patient G., 21 years old, on 12.10.2023 applied to the trauma center № 114 after a wind-driven tree fell on his right forearm area. A fracture of the right scapula with displacement of the fragments was detected, the patient was referred to the emergency room of the R.R. Vreden Research and Development Center for further examination and treatment. On admission to the department, the patient's right supraclavicular region was longer than the left one, the right supraclavicular region at the acromial end was swollen and painful, without visible deformity. Results. The study presents traumatologic pathology, namely, fractures of the articular and clavicular processes of the scapula with displacement of the fragments, as well as fracture of the acromial process of the scapula with minimal displacement of the fragments and cranial subluxation of the acromial end of the clavicle. The causes, diagnostic methods and surgical treatment of this pathology are described. Conclusions. Due to the growing amount of data on satisfactory postoperative results in patients with scapula fractures, there is still interest in surgical trends in the treatment of these patients. However, it is worth remembering that postoperative complications after repositioning and fixation of bone fragments continue to be an urgent problem.

A platypterygiid ichthyosaur from the Cenomanian of central New Zealand

ABSTRACT Understanding of Cretaceous ichthyosaur diversity has substantially increased in recent years; however, Eastern Gondwana’s ichthyosaur fauna is still poorly understood, particularly in New Zealand where only scarce fragmentary material is known. A Cenomanian-aged partial ichthyosaur skeleton has been recovered from the northeastern South Island of New Zealand and is described here. Whilst the specimen is too fragmentary to formally name, this taxon shows an extreme reduction of the basioccipital extracondylar area, a scapula with a prominent acromion process and a strap-like scapula shaft, as well as a complete left pelvic girdle with an elongated depression on the anteroproximal face of the ischiopubis. We suggest that it is a late branching member of the platypterygiid ichthyosaurs, closely related to the Eastern Gondwanan ichthyosaur Platypterygius australis and to many European Cretaceous taxa. However, it appears to be unrelated to the Cretaceous ichthyosaurs of Western Gondwana, suggesting potential regionalism amongst the Gondwanan Cretaceous ichthyosaur populations.

Appropriate intradeltoid muscle needle penetration depth in vaccine administration: an MRI study in Thailand.

The objective of this study was to evaluate the appropriate vaccination needle penetration depth into the deltoid muscle to avoid injection-site complications from an inappropriate injection depth and/or injection site in the Thai population. This was a retrospective study using axial proton density-weighted images of MRI shoulders at the level of 2 fingerbreadths below the acromion process to measure the combined thickness of the skin, subcutaneous fat pad and deltoid muscle to evaluate the percentage of injections into the deltoid muscle with various needle penetration depths. There were 509 MRI shoulder images of 222 males and 287 females (265 right shoulders and 244 left shoulders). The average body mass index and age were 24.54 ± 3.54 kg/m2 and 64.81 ± 10.20 years, respectively. Using a needle penetration depth of 12.7 mm (0.5 inches) achieved 100% of injections into the deltoid muscle. We recommend advancing the entire length of a 0.5-inch needle perpendicular to the skin at 2 fingerbreadths below the acromion process for adult intradeltoid vaccinations. This approach ensures optimal vaccine delivery and minimizes the risk of injection-related injuries.

Gross and morphometric studies on scapula of Indian elephant

The main objective of the work was to study gross and morphometry of the scapula of Indian elephant. The fore and hind limbs of the elephant were arranged in an almost vertical position under the body, similar to a pillar or leg of a table rather than being in the angular position seen in many other quadruped mammals to support great weight. The aim of this study was to elucidate the osteological outline on the bones of fore limb in Elephants. Three Indian elephants were used, along with some of the specimens available at the Department of Veterinary Anatomy, College of Veterinary Science and Animal Husbandry, Mhow. It was seen that scapula had two surfaces (lateral and medial), three borders (Cranial border, caudal border and dorsal border) and three angles (cranial, caudal and glenoid). The lateral surface was divided into two unequal fossa by a prominent scapular spine. The height of the scapular spine was lowest in the proximal part, but it increased towards the distal part, and was maximum towards near the acromion process. In the medial surface, a large subscapular fossa was present. The dorsal border was formed by the union of lateral and medial surfaces towards the vertebral column.

Evaluation of a method to measure the ratio of pelvic limb to thoracic limb girth in dogs

Objective To determine if a landmark-incorporated limb girth measurement in sound dogs, utilising the greater trochanter and the acromion process, would be both reliable and have a consistent ratio between pelvic limb (PL) and thoracic limb (TL) muscle measurements. Background To establish a reliable and reproducible reference range for sound dogs. This reference range may help clinicians further evaluate dogs during lameness and musculoskeletal examinations. Evidentiary value Prospective study of 115 sound dogs measured by a single observer. Methods Examinations were performed by one observer, using a Gullick II tape measure for PL to TL ratio (PL:TL) measurements for 115 dogs. Bodyweight, breed, body condition score (BCS), and sex were recorded. Each limb was measured three times. The average PL:TL per dog was calculated. Further statistical analysis was used to calculate intra-observer variance and the correlation of limb girth to body weight, BCS, and sex, with significance set at P &lt; 0.05. Results The average PL:TL of the sample was 1.515 ± 0.049. Fifty-two dogs of the 115 cases (45%) had a PL:TL ratio of 1.500. PL:TL measurements were not related to dog weight, BCS, or sex. The intra-class correlation was reported to be 0.99. Conclusion Our study suggests that a landmark-incorporated measurement in a weight-bearing position can be reproducible. Further investigation is required to determine if this measurement can be reproducible between multiple observers. Application A landmark-incorporated limb girth measurement may guide clinicians in case progression and help pinpoint subclinical musculoskeletal disease in dogs.

Effects of 56-Kilogram Kettlebell Swing Endpoint on Total Body Mechanics.

Ross, JA, Keogh, JWL, Lorenzen, C, and Lake, J. Effects of 56-kilogram kettlebell swing endpoint on total body mechanics. J Strength Cond Res 37(12): 2333-2338, 2023-In the past 2 decades, kettlebell training popularity has increased and the range of kettlebells has expanded to 2-92 kg. However, commercially available kettlebells above 56 kg have 12 kg increments, so alternatives to load are required to provide a suitable way of increasing training stimulus until the athlete is strong enough for a load increase. This study aimed to determine the differences in the force plate-derived biomechanical characteristics of heavy kettlebell swings to 3 different heights, as altering the height of the kettlebell swing may be one way to alter the mechanical demands with the same kettlebell mass. Fifteen resistance-trained men performed the kettlebell swing to acromion process height (AH), acromion process height + 20% (AH+20), and acromion process height-20% (AH-20). Swing height significantly affected vertical braking and propulsion phase net impulse and displacement, vertical braking velocity, and braking and propulsion work but not braking and propulsion duration. Altering kettlebell swing trajectory endpoint is a method to regress/progress the demands of kettlebell training. Coaches may be able to alter the acute demands and likely chronic adaptations of kettlebell training by prescribing different swing heights and kettlebell masses to their athletes.

Morphometric Variation of Acromion Process in A Bangladeshi Population

A cross-sectional, descriptive study was done on 150 (70 right and 80 left) fully ossified dry human scapulae of Bangladeshi people to find out the variation in length and breadth of the acromion process. Sample collection was carried out in the Department of Anatomy, Mymensingh Medical College, Bangladesh, between January and December of 2019. Any kind of damaged or broken scapulae were excluded to maintain standard measurement. Length and breadth were measured with the help of digital Vernier slide calipers. The mean (±SD) length was 41.77±5.87 mm and 40.84±6.262 mm on right and left sided scapulae respectively and the mean (±SD) breadth was 22.19±3.08 mm on right sided scapulae and 22.1±2.69 mm on left sided scapulae. These data are important to compare Bangladeshi scapulae to those from various other races that could contribute to demographic studies of shoulder disease probability and management in Bangladeshi population.&#x0D; CBMJ 2023 July: Vol. 12 No. 02 P: 183-187

Morphometry and Morphology of the Acromion Process and Its Implications in Subacromial Impingement Syndrome.

Introduction Subacromial impingement syndrome (SIS) is a common shoulder disorder characterized by pain and limited range of motion in the shoulder joint. It is frequently attributed to the compression or impingement of the rotator cuff tendons and bursa between the humeral head and the acromion process of the scapula during arm elevation. Subacromial impingement syndrome may arise as a result of the morphology of the acromion process, a bony protrusion at the top of the scapula that is important in the biomechanics of the shoulder joint. In order to detect potential anatomical differences that can predispose people to subacromial impingement syndrome, medical professionals and researchers need to have a thorough understanding of the morphometry and morphology of the acromion process. Aims and objectives The aim of the present study wasto measure the morphometric and morphological characteristics of the acromion process in dried human scapulae that belonged to the North Indian population. Materials and methods This was a cross-sectional study that was carried out on 120 undamaged adult human scapula, of which 52 belonged to the right side and 68 belonged to the left side. Our study focused on analyzing the morphology of the acromion process as well as determining its maximum length, maximum breadth, acromio-coracoid distance, acromio-glenoid distance, and thickness. A statistical analysis of the observed parameters was carried out using the chi-square test and independent t-test with the help of Statistical Package for the Social Sciences (SPSS, IBM Corp., Armonk, NY) 24.0. Statistical significance was set at 0.05 (if the P-value ≤ 0.05, it is significant). Results We observed that the quadrangular shape (51.67%) of the acromion process was most commonly reported in our study, while the tubular (9.99%) shape was the least common. The difference in the incidences of various shapes of the acromion process on the right and left sides of the scapula was found to be statistically significant (p-value ≤ 0.05). In this study, the curved or type II acromion process was the most common type (53.34%) observed, while the least common shape reported was the hooked type (18.33%). The average length of the right acromion process was 44.52±6.61 mm, and the left acromion process was 45.13±6.35 mm. For the breadth, the right acromion had an average value of 28.31±4.67 mm, while the left had an average of 28.34±4.92 mm. The thickness of the right acromion measured 7.10±1.73 mm, and the left acromion was 7.53±1.44 mm. The acromio-coracoid distance on the right side was 34.59 ± 6.47 mm, and the left side was 37.46±6.22 mm. The acromio-glenoid distance was measured to be 32.31±5.87 mm on the right side and 33.18±5.39 mm on the left side. Conclusions Planning and carrying out an acromioplasty require an understanding of the morphometric parameters of the acromion process. Although there is a paucity of research on its morphometric evaluation in the North Indian population, the surgeons would be able to use these data as a reference.

Morphometric analysis of adult Hippopotamus forelimb bones

Background: Understanding the adaptative changes in bone shapes among animals involves studying bone morphology. We examined adult hippopotamus (Hippopotamus amphibius)forelimb bones at the anatomy laboratory of Patuakhali Science and Technology University, Bangladesh. Samples were collected from Rangpur Recreation Park and Zoo between September 2021 and July 2022. Methods: Bones were processed by removing mud and boiled with water. Subsequently, hydrogen peroxide was used for one and a half hours to remove any remaining muscular tissues from the bones. Following this, the bones were air-dried under sunlight for a month. Measurements of key parameters including length, height, width, circumference, and weight were obtained using calibrated instruments, thereby ensuring precision. Results:The scapula displayed a pronounced and elongated spine – the spina scapulae – that demarcated the lateral surface into two distinct fossae: the supraspinous fossa and the infraspinous fossa. The distal expansion of the spine, known as the acromion process, consisted of the fused hamate process and suprahamate process. The head of humerus was round and featured two undivided tubercles: the greater or major and the lesser tubercle. On the medial surface, a small and shallow radial fossa was observed, while on the opposite side, a large and deep olecranon fossa was present. The proximal surface of the radius head exhibited concave fovea capitis radii, which articulated with the lateral condyle of the humerus. The shaft of the radius was slightly expanded in the cranio-caudal direction. Similarly, the shaft of the ulnahad a somewhat triangular shape, resembling the shape of the radius shaft. Medially, it had a convex facet that articulated with the radius, and cranially, the interosseous space between the radius and ulna was longer than the caudal view. Conclusions: The unique anatomical features and morphometric measurements of the forelimb bones in hippos can be beneficial for identification, radiographic interpretation, and forensic investigation. Furthermore, this study provides essential guidelines and insights for understanding appropriate anatomical parameters.