Lateral Elbow Research Articles

Effects of a Conventional Treatment Plus Scapular Exercises Program in Patients With Chronic Lateral Elbow Tendinopathy: A Pre-Post Single-Group Study.

Weakness of the shoulder girdle muscles has been reported in patients with chronic lateral elbow tendinopathy. The aim of this study was to assess the short- and long-term effects of a conventional treatment plus scapular exercises program in patients with chronic lateral elbow tendinopathy. A single-group prestudy and poststudy were conducted. The primary outcome was the Patient-Rated Tennis Elbow Evaluation questionnaire score. Secondary outcomes were grip strength; Disabilities of the Arm, Shoulder, and Hand questionnaire score; Visual Analogue Scale score at rest and at grip, and presence of scapular dyskinesis. A total of 65 patients (72.3% females), with a mean age of 41.8years, were analyzed. At the end of 6weeks, the results showed clinically and statistically significant differences (P < .05). At 1-year follow-up, the differences were: Patient-Rated Tennis Elbow Evaluation -31 points (P < .001); grip strength +33.6% (P < .001); Disabilities of the Arm, Shoulder, and Hand -34.2 points (P < .001); Visual Analogue Scale at rest -2.5cm (P < .001); and Visual Analogue Scale at grip -2.3cm (P < .001). At the end of 6weeks and at 1-year follow-up, conventional treatment plus scapular exercises program showed statistically and clinically significant differences in all functional outcomes assessed in patients with lateral elbow tendinopathy.

Kinesiotaping versus counterforce brace in the management of lateral elbow tendinopathy

Purpose: The main purpose of the current study was to assess whether counter force brace (CFB) offers any additional value over Kinesiotaping (KT) in the management of tennis elbow. Materials and Methods: Forty-five females with clinically diagnosed tennis elbow participated in the current study. They were equally assigned into three groups of equal numbers. 12 sessions over 4 weeks of treatment interventions; experimental group A received the traditional physiotherapy program in addition to KT. Group B received the physiotherapy program in addition to the CFB. Group C (Control Group) received the physiotherapy program only. The degree of tennis elbow pain and myoelectrical activities of forearm muscles were measured. Results: There was a statistically significant reduction of pain in the experimental group A (KT) in comparison with the control group (p = 0.000), while a statistically significant reduction of pain (p = 0.000) and improvement of the myoelectrical activities of the forearm muscles (p = 0.000) were detected in the experimental group B (CFB) in comparison with the control group. In addition, the statistically significant reduction of pain (p = 0.000) and improvements in wrist flexors and extensors (p = 0.001 and p = 0.000, respectively) were detected in CFB compared with KT. Conclusion: Compared to KT or a physical therapy program alone, the use of CFB in the treatment of lateral elbow tendinopathy may be beneficial, especially in reducing pain and enhancing the muscle activities of the elbow flexors and extensors.

Understanding the recurrent pulled elbow.

Nursemaid elbow is subluxation of the radius head seen in early childhood. The aim of this study was to examine the epidemiology of recurrent dislocations and the effect of hyperlaxity and bone anatomy on recurrent dislocations in these injuries, for which the pathogenesis has not been fully clarified. The study included a total of 329 paediatric patients who presented at the Paediatric Emergency Department (ED) between January 2016 and December 2022, and were diagnosed with Nursemaid Elbow. On presentation at ED, two-directional elbow radiographs were taken of all the patients and the radius head-neck ratio was measured on the lateral elbow radiograph. The Beighton score of joint hyperlaxity was evaluated in all the patients with a history of recurrent dislocation. A statistically significant difference was determined between the Beighton score groups in respect of the number of dislocations in multiple dislocations (P = 0.002). No statistically significant relationship was determined between the number of dislocations and the lateral radius head/neck ratio (P = 0.061). Hyperlaxity syndrome should be kept in mind in the aetiology of multiple dislocations.

Percutaneous Tenotomy for Chronic Tennis Elbow: A Minimally Invasive Technique with Better Outcomes - A Case Series.

Tennis elbow (lateral epicondylitis elbow) is a self-limiting disease of indeterminate pathogenesis. Conservative therapy is the treatment of choice. In chronic tennis elbow with failure of conservative therapy; surgical treatment is a method of choice. Percutaneous tenotomy of extensor origin for patients with chronic tennis elbow is a minimally invasive technique with better long-term outcomes. Ten patients (six males, four females) presented with chronic tennis elbow, who did not respond to conservative treatment/non-surgical intervention for more than 6 months underwent percutaneous tenotomy in an outpatient setting. Two patients were lost to follow-up at 2 months' post-operative. The remaining eight patients were evaluated at a mean follow-up of 3 years and assessed using the numerical rating scale, disabilities of the arm, shoulder and hand questionnaire ,and Oxford elbow score. These scores had a statistically significant difference in baseline to 3-year follow-up values (P < 0.05). No adverse outcomes, recurrence of symptoms, and signs of lateral epicondylitis elbow were noted and none required open surgical release. Percutaneous tenotomy, a minimally invasive technique is an effective and well-tolerated treatment for chronic tennis elbow and gives good pain relief and functional recovery.

Ultrasound-guided injection versus landmark-guided injection using corticosteroids for the treatment of lateral epicondylitis

Abstract Purpose To compare the clinical results of corticosteroid injection using landmark-guided injection (LMGI) and ultrasound-guided injection (USGI) techniques. Patients and methods We injected corticosteroids in 55 patients with extraarticular tennis elbow using LMGI and USGI techniques. All patients suffered from lateral elbow pain for more than 3 months with a tender point on the lateral epicondyle. This pain was exaggerated by wrist extension and specific physical activity. For postprocedural evaluation, in a randomized controlled assessor-blinded clinical trial, visual analog score (VAS), pain-free grip strength (PFGS), and the Nirschl staging system were assessed at 1, 6, 24 weeks, and 12 months. Results Only 48 participants were included in the final analysis (seven were excluded). Preoperatively, the average VAS scores, tenderness over lateral epicondyle, PFGS values, and Nirschl stages were almost the same (P=0.620, 0.505, 0.784, and 0.455). After 1 week of injection, there was no significant difference noticed in the VAS for pain at rest, tenderness during palpation, the PFGS and Nirschl stages between group 1 and group 2 (P=0.947, 0.724, 0.484, and 0.677, respectively). A statistically significant difference between the two groups was observed from 6 to 48 weeks. At the final follow-up, group 2 had a statistically significant better outcome when compared to group 1 (P&lt;0.05). Conclusion USGI had a better long-term outcome than LMGI in the treatment of lateral epicondylitis.

Optimising physiotherapy for people with lateral elbow tendinopathy – Results of a mixed-methods pilot and feasibility randomised controlled trial (OPTimisE)

BackgroundThe OPTimisE intervention was developed to address uncertainty regarding the most effective physiotherapy treatment strategy for people with Lateral Elbow Tendinopathy (LET). ObjectivesTo assess the feasibility of conducting a fully-powered randomised controlled trial (RCT) evaluating whether the OPTimisE intervention is superior to usual physiotherapy treatment for adults with LET. DesignA mixed-methods multi-centred, parallel pilot and feasibility RCT, conducted in three outpatient physiotherapy departments in the UK. MethodPatients were independently randomised 1:1 in mixed blocks, stratified by site, to the OPTimisE intervention or usual care. Outcomes were assessed using pre-defined feasibility progression criteria. Results50 patients were randomised (22 Female, 28 Male), mean age 48 years (range 27–75). Consent rate was 71% (50/70), fidelity to intervention 89% (16/18), attendance rate in the OPTimisE group 82% (55/67) vs 85% (56/66) in usual care, outcome measure completion 81% (39/48) at six-month follow-up. There were no related adverse events. Patients and physiotherapists reported that the OPTimisE intervention was acceptable but suggested improvements to the trial design. 49 patients were recruited from physiotherapy referrals vs one from primary care records. Outcome measure return rates were higher when completed online (74%) compared to postal questionnaire (50%). Exploratory analysis showed improvements in both groups over time. ConclusionsIt is methodologically feasible to conduct a fully powered RCT comparing the clinical and cost-effectiveness of the OPTimisE intervention versus usual physiotherapy treatment. Considering the similar improvements observed in both groups, careful consideration is needed regarding the priority research question to be addressed in future research.

Comparison of Traditional Chinese Medicine Treatment and Western Medicine Treatment of Tennis Elbow (External Humeral Epicondylitis)

Tennis elbow is a chronic strain disease characterized by lateral elbow joint pain and limited movement. There are a variety of treatment methods, mainly consist of surgical treatment and non-surgical treatment, surgical treatment has quick effect, while non-surgical treatment has a low recurrence rate and is minimally invasive or non-invasive. Under different theoretical systems of TCM and Western medicine, non-surgical treatment methods are also different. Common treatment methods of traditional Chinese medicine include acupuncture, massage, traditional Chinese medicine fumigation, etc. Extracorporeal shock wave and drug use. This article reviewed and summarized many domestic and foreign literatures on the treatment methods of external humeral epicondylitis, and listed the similarities and differences in clinical treatment methods of external humeral epicondylitis under two different treatment systems of traditional Chinese medicine and Western medicine.

Targeted four-dimensional computerized tomography scans for elbow disorders: a literature review and refinement of existing technique with two exemplar cases

Background4D-CTs or motion CTs in elbow disorders have several potential advantages over conventional static imaging such as a reduction of misdiagnoses, a more targeted surgical approach, better patient understanding of their condition and potentially faster operative times. However, the radiation dose is higher than conventional static CT scans so this should be used judiciously. Our study reviews the current literature for 4D-CTs in dynamic elbow disorders and provides a technical note describing radiation-reduced targeted elbow 4D-CTs (te4D-CT) with two exemplar cases alongside our recommendations for when te4D-CTs are indicated. Methodste4D-CTs are performed in a lateral decubitus elbow above head position. Preliminary static source axial cut CT obtained with subsequent sagittal and axial planes reconstruction and 3D reconstruction obtained, followed by scan performed in motion and reconstructed to 4D Component. te4D-CTs are taken for either flexion and extension (FE) or pronation and supination (PS) motions depending on the clinical pathology suspected following thorough clinical examination. Resultste4D-CT for PS and FE protocol scans had an effective radiation exposure dose of 0.53 and 0.95mSv respectively compared to 1.13-1.83mSv in conventional elbow 4D-CTs. In addition, te4D-CTs have good diagnostic accuracy provided that the FE or PS pathology is identified carefully by the ordering physician. Conclusionte4D-CT using isolated pronation and supination, or flexion and extension protocols does come with a significantly reduced radiation dose and can be of equal clinical yield compared with 4D-CTs.

Skin blood flow as an objective measure for lateral elbow tendinopathy

PURPOSE: To investigate the test-retest reliability, side-to-side difference, responsiveness, and concurrent validity of skin blood flow (SkBF) measured by laser Doppler flowmetry (LDF) in individuals with acute or subacute lateral elbow tendinopathy (LET). METHODS: Eighteen individuals with acute or subacute LET were recruited for this study. SkBF was measured over the lateral epicondyle and common extensor origin on both ipsilateral and contralateral sides. The intraclass correlation coefficient (ICC3,1) was used to evaluate test-retest reliability. A paired t-test was used for comparing the side-to-side difference. Responsiveness was reported with a change score, paired t-test, effect size (ES), and standardized response mean (SRM). The concurrent validity of SkBF was investigated by correlating with a visual analog scale (VAS) pain intensity during resisted wrist extension isometric contraction using the Spearman correlation coefficient. RESULTS: Test-retest reliability was good at lateral epicondyle (ICC3,1 = 0.899), and at common extensor origin (ICC3,1 = 0.803). A side-to-side difference was found between the two sides (p &lt; 0.001). For responsiveness, the change score for SkBF at the lateral epicondyle was – 8.04, and the common extensor origin was – 3.54. The ES and SRM ranged from – 0.71 to – 0.78. Concurrent validity was reported with a strong correlation with pain intensity (r = – 0.637). DISCUSSION: SkBF is a reliable and responsive variable for investigating the elbows with acute or subacute LET providing clinical information according to its inflammatory responses. However, the concurrent validity can be found only for SkBF at common extensor origin, which correlates with pain during resisted wrist extension isometric contraction.

Radial tunnel syndrome-diagnosis and treatment

Radial tunnel syndrome is defined as intermittent compression of the deep branch of the radial nerve through the borders of the radial tunnel. This is one of the diagnosis in the spectrum of the causes for lateral elbow pain. The condition is associated with pain in the area of radial nerve compression which is located in most of the cases at the entrance of the nerve in the arcade of Frohse. The clinical examination is of utmost importance for determination of the diagnosis. . The standard static electromyography can’t record the intermittent compression of the nerve and it is not sensitive for the injury of the unmyelinated fibers (C-type) which is the main source of the pain. The goals of the treatment of RTS are to eliminate the pain and to encourage the patients to return to their routine activities. A trial of nonsurgical treatment is warrant in all the patients. In the cases with no respond to the conservative methods we advocate for surgical decompression of the nerve.

Alteration of Interhemispheric Inhibition in Patients With Lateral Epicondylalgia

Patients with lateral epicondylalgia (LE) show alterations in the primary motor cortex (M1) contralateral to the affected side. Cortical alterations have been investigated by measuring intracortical facilitation/inhibition; however, their association with pain remains controversial. Furthermore, no studies have investigated changes in interhemispheric inhibition (IHI). IHI can be assessed using the ipsilateral silent period (iSP) known as the temporary inhibition of electromyographic activity evoked by transcranial magnetic stimulation in the ipsilateral M1 of the contracting muscle. To better understand the relationship between cortical alterations and pain in LE, this observational study investigated the relationship between iSP and pain in LE. Twenty-seven healthy volunteers and 21 patients with LE were recruited. The duration of iSP in the extensor carpi radialis brevis was measured. The IHI asymmetry ratio was calculated to determine the IHI balance. Pain and disability were scored using the Japanese version of the patient-rated elbow evaluation. We observed increased inhibitory input from the ipsilateral M1 on the affected side to the contralateral M1 in LE. Additionally, the IHI balance correlated with pain severity. Hence, regulating imbalanced IHI can potentially decrease lateral elbow pain in LE. PerspectivePatients with lateral epicondylalgia (LE) experience persistent pain and cortical alterations. However, there is no established relationship between cortical alterations and pain. This study demonstrated that the interhemispheric inhibition (IHI) balance is correlated with pain. Regulating imbalanced IHI can potentially decrease lateral elbow pain in patients with LE.

Role of vitamin D in lateral epicondylitis among Egyptians

BackgroundLateral elbow pain is a prevalent musculoskeletal disorder affecting the elbow’s epicondyle region. One form of lateral elbow pain is lateral epicondylitis, which is a degenerative disorder of the musculotendinous system. Adequate levels of vitamin D are essential for maintaining musculoskeletal health. Our study aimed to assess the role of vitamin D in lateral epicondylitis among Egyptians.ResultsOur research revealed that there is a significant correlation between vitamin D deficiency and lateral epicondylitis. Patients with vitamin D deficiency displayed worse patient-rated tennis elbow evaluation score (PTREE), visual analog scale score (VAS), and grip strength. These findings indicate a statistically significant association between lateral epicondylitis patients with deficient vitamin D and each of the PTREE scores (p < 0.001), VAS score (p < 0.001), and hand grip strength (p < 0.001).ConclusionThe etiology of lateral epicondylitis is not yet fully understood. However, our study provides evidence supporting the notion that low levels of vitamin D may be one of the risk factors in the etiology of lateral epicondylitis among Egyptians.

Navigating a Rare Type IV Capitellar fracture: A Case Report and Comprehensive Literature Review.

Capitellar fractures are rare, it accounts 1% of elbow fractures, and can be challenging to diagnose initially. Distinctive "double arc sign" on lateral elbow radiograph is pathogonomic. 3D CT scans is . ORIF is the preferred treatment, but the choice of fixation methods lacks consensus, although headless compression screws are commonly used. This case report presents a Type IV capitellar fracture in a 14-year-old boy resulting from a fall. The patient underwent successful ORIF using 4.0mm cannulated screws inserted posterior to anterior without penetrating joint surface, leading to complete functional recovery. At the 6-month follow-up, the patient exhibited robust healing without signs of capitellar avascular necrosis (AVN).The case underscores the significance of clinical suspicion and meticulous radiographic evaluation to avoid overlooking capitellar fractures. Moreover, it showcases the effectiveness of cannulated screws as a viable alternative in the absence of headless compression screws, offering comparable stability and excellent functional outcomes.

The hypoalgesic effects of wrist extensors training with blood flow restriction in patients with lateral elbow tendinopathy: a study protocol for a cross-over randomized controlled trial

Background: Lateral elbow tendinopathy (LET) is a disabling overuse injury with a significant healthcare burden. Despite the fact that exercise interventions are considered the best recommended treatment option of LET, their effectiveness in reducing pain and improving function remains debatable. The aim of our study is to evaluate the immediate effects of a new method of exercise using blood flow restriction (BFR) on pain perception and pain-free grip strength in patients with LET. Methods: This study was designed as a cross-over randomized controlled trial. We will compare an intervention using wrist extensors training with (WET-BFR) to a control intervention using WET-without-BFR in patients with LET. All measurements will be taken by a blinded assessor pre- and post-intervention. Primary outcome measures will be the changes in pressure pain thresholds at the lateral epicondyle, extensor carpi radialis brevis, C4 vertebra and tibialis anterior. Secondary outcome measure will be the changes in pain-free grip strength ratio. Conclusions: New approaches are needed to improve the treatment outcomes in LET. Although BFR training was found more effective in improving function and treatment success than conventional training, the effects on pain intensity were poor. Our hypothesis is that using the best BFR practice guidelines for wrist extensors training might be more effective to reduce pain sensitivity compared with non-BFR training in patients with LET. The trial will provide new research data to inform clinical practice regarding the effects of using BFR training in the current patient group. Trial registration: University of West Attica ethics committee: 9150/01-02-2023, ClinicalTrials.gov: NCT05919914

Added value of ultrasound-guided percutaneous needle tenotomy over hydrodissection and physiotherapy in chronic lateral elbow tendinopathy: a pilot randomized controlled trial.

There is no consensus on the most suitable non-surgical treatment of chronic lateral elbow tendinopathy. The aim of this pilot randomized controlled trial was to evaluate the size of effect of ultrasound-guided percutaneous needle tenotomy. Three intervention arms were formed: 1) percutaneous needle tenotomy, hydrodissection, and physiotherapy; 2) hydrodissection and physiotherapy; and 3) physiotherapy alone. Patients with chronic lateral elbow tendinopathy were randomized. Clinical endpoints included multiple questionnaires after three months: Quick Disabilities of the Arm, Shoulder and Hand (QuickDASH), Numeric Rating Scale (NRS) pain at rest and during activity, and EuroQol 5D-5L (EQ-5D-5L). Thirty patients were included of 128 screened. The QuickDASH score improved in the percutaneous needle tenotomy and physiotherapy group, but not in the hydrodissection group. The NRS pain at rest and during activity improved more in the percutaneous needle tenotomy (resp. -2 and -2) and hydrodissection (resp. -3 and -3) groups than in the physiotherapy (resp. +1 and -1) group. The EQ-5D-5L improved similarly in all groups. Patients receiving percutaneous needle tenotomy and/or hydrodissection may show better results in terms of pain but not in their functional outcomes compared to those who received physiotherapy alone. The size of effect, however, is small, so a large sample size is needed for a future randomized controlled trial to further investigate these results.

Prevalence, Timing, Locational Distribution, and Risk Factors for Heterotopic Ossification After Elbow Arthroscopy

Background: Arthroscopic techniques aim to reduce complications and accelerate recovery of the elbow after treatments for posttraumatic stiffness, arthritis diseases, lateral epicondylitis, ligament reconstruction, and elbow trauma. However, data on the true prevalence and characteristics of heterotopic ossification (HO) formation after elbow arthroscopy are limited. Purpose: To investigate the prevalence, timing, locational distribution, and risk factors of HO after elbow arthroscopy. Study Design: Cohort study; Level of evidence, 4. Methods: Data on 205 patients undergoing elbow arthroscopy by a single senior elbow surgeon at a single institution between May 2011 and January 2022 were retrospectively reviewed. The patients were evaluated at 2 weeks, 8 weeks, 6 months, and then annually after surgery or more frequently if HO developed, with a minimum of 1 year of postoperative follow-up. Postoperative anteroposterior and lateral elbow radiographs were taken at 2 weeks to rule out fracture and at 8 weeks to identify HO. The clinical outcomes were evaluated based on the pain visual analog scale; the shortened version of the Disabilities of the Arm, Shoulder and Hand score; Mayo Elbow Performance Score; and the Single Assessment Numeric Evaluation scores before and after surgery. Bivariate logistic regression analyses were used to determine factors affecting HO prevalence. Results: Thirteen (12 male, 1 female) of 205 (6.3%) patients developed HO, with 10 (76.9%) with HO that formed on the medial compartment of the elbow. Ten (76.9%) patients were diagnosed at 8 weeks after arthroscopic surgery, 1 (7.7%) at 6 months after surgery, and 2 (15.4%) at 12 months after surgery. HO was not found at 2 weeks after surgery in any patient. The mean follow-up time was 3.5 years (range, 1.0-11.8 years). Eleven asymptomatic patients were treated nonoperatively, and 2 symptomatic patients underwent HO excision arthroscopically or had a combination of open surgery and arthroscopy. Age was a protective factor for HO formation (odds ratio [OR], 0.953; 95% CI, 0.910-0.999; P = .047). The risk factors for HO formation were tourniquet time (OR, 1.042; 95% CI, 1.019-1.065; P < .001) and surgical time (OR, 1.026; 95% CI, 1.011-1.041; P < .001). Conclusion: Among 205 patients who underwent elbow arthroscopy, HO was a minor complication of elbow arthroscopy, with a prevalence rate of 6.3%, and was usually located on the medial compartment of the elbow. Although the presence of HO may not affect the clinical outcomes in most patients, it should be carefully monitored for a minimum of 8 weeks postoperatively. Younger age, longer tourniquet time, and longer surgical time contributed to HO formation after elbow arthroscopy.

Sensitization-associated and neuropathic-associated symptoms in patients with unilateral lateral elbow tendinopathy: an exploratory study

ABSTRACT Objectives We evaluate the presence of sensitization-associated symptoms and neuropathic pain features and identify if there is an association between these symptoms and pressure pain sensitivity, pain, and related-disability in lateral elbow tendinopathy. Methods Thirty-seven (43% women, age: 45.5 ± 9.5 years) patients with lateral elbow tendinopathy completed: demographic (i.e. age, height, and weight); clinical (i.e. pain history, pain intensity, and Disabilities of the Arm, Shoulder and Hand); and psychophysical (i.e. pressure pain thresholds at the elbow, cervical spine, hand, and leg) outcomes, and the Central Sensitization Inventory and Self-administered Leeds Assessment of Neuropathic Symptoms and Signs questionnaires. Step-wise multiple linear regression models were performed to identify predictors of sensitization- or neuropathic-associated symptoms. Results Six (16%) patients exhibited sensitization-associated symptoms (mean: 46.5, SD: 6.1), whereas 13 (35%) patients showed neuropathic-associated symptoms (mean: 13.5; SD: 1.4). Sensitization-associated symptoms were positively associated with neuropathic-associated symptoms (r = 0.538, P = .001) and negatively associated with pressure pain thresholds at the leg (r = -0.378, P = .021). Neuropathic-associated symptoms were positively associated with related-disability (r = 0.479, P = .003) and negatively associated with pressure pain threshold at the elbow (r = -0.394, P = .017). Stepwise regression analyses revealed that neuropathic-like symptoms explained 26.8% of the variance of sensitization symptoms (r2: 0.268), whereas pressure pain threshold at the elbow explained an additional 6.6% to neuropathic-like symptoms (r2: 0.334). Conclusion This explorative study identified sensitization- and neuropathic-associated symptoms in 16% and 35% of the people with lateral elbow tendinopathy. Sensitization- and neuropathic-associated symptoms were associated. Pressure pain sensitivity at the elbow (peripheral sensitization) was associated with neuropathic -associated symptoms.

Supracondylar humeral fractures and lateral elbow condyle fractures in children: association between body weight, clinical signs, and fracture severity

Supracondylar humeral fractures and lateral elbow condyle fractures in children: association between body weight, clinical signs, and fracture severity

The Normal Tendon and Ligament Anatomy of the Lateral Elbow: Implications for Tennis Elbow Syndrome

Introduction: Numerous authors have studied the role that ligaments play in various elbow instability syndromes. There is no published article that has studied the role of ligaments in tennis elbow pathology. Tennis elbow patients exhibit increased pain during elbow extension. Lateral ligaments become taut in extension. Therefore, researchers decided to investigate the possibility of an anatomical link between the tendon and ligament anatomy, and how this might help to understand tennis elbow. Methods: Four fresh cadaveric elbows were dissected. Researchers examined the four tendons which comprise the common extensor origin (CEO). Researchers documented the exact footprint created by each tendon origin creates on the Humerus. Researchers also studied the exact attachments of the various named lateral ligaments both macroscopically and histologically using H and E staining. Results: Four tendons contribute to the CEO: Extensor Carpi Radialis Brevis (ECRB), Extensor Digitorum Communis (EDC), Supinator and Anconeus. All four tendons are inseparably blended together, when viewed under 2.5 x power loupe magnification. The deep fibers of the CEO are inseparably blended with the lateral collateral ligament (LCL). This was confirmed with macroscopic inspection, under 2.5 x loupe magnification, and at histological assessment. Discussion/conclusion-clinical relevance: Researchers already know that the LCL becomes taught in extension, and that the ECRB tendon becomes taut in forearm pronation. These two actions produce two shear forces at the CEO which pull in opposite directions. Researchers have found that these tendons and ligaments are inseparably blended together over a distance of 10 mm-between the lateral epicondyle and the radio capitellar joint line-researchers propose that this unique anatomy creates a specific vulnerable location whereby there exists shear forces between those two layers of collagenous tissue. Researchers propose that this explains the initiation and the perpetuation of tennis elbow lesions. It also explains the clinically observed pain during elbow extension in tennis elbow.

Correlations Between Eight Comprehensive Skeletal Maturity Systems in a Modern Peripubertal Pediatric Population.

Several skeletal maturity systems allow for accurate skeletal age assessment from a wide variety of joints. However, discrepancies in estimates have been noted when applying systems concurrently. The aims of our study were to (1) compare the agreement among 8 different skeletal maturity systems in modern pediatric patients and (2) compare these discrepancy trends qbetween modern and historic children. We performed a retrospective (January 2000 to May 2022) query of our picture archiving and communication systems and included peripubertal patients who had at least two radiographs of different anatomic regions obtained ≤3 months apart for 8 systems: (1) proximal humerus ossification system (PHOS), (2) olecranon apophysis ossification staging system (OAOSS), (3) lateral elbow system, (4) modified Fels wrist system, (5) Sanders Hand Classification, (6) optimized oxford hip system, (7) modified Fels knee system, and (8) calcaneal apophysis ossification staging system (CAOSS). Any abnormal (ie, evidence of fracture or congenital deformity) or low-quality radiographs were excluded. These were compared with a cohort from a historic longitudinal study. SEM skeletal age, representing the variance of skeletal age estimates, was calculated for each system and used to compare system precision. A total of 700 radiographs from 350 modern patients and 954 radiographs from 66 historic patients were evaluated. In the modern cohort, the greatest variance was seen in PHOS (SEM: 0.28y), Sanders Hand (0.26y), and CAOSS (0.25y). The modified Fels knee system demonstrated the smallest variance (0.20y). For historic children, the PHOS, OAOSS, and CAOSS were the least precise (0.20y for all). All other systems performed similarly in historic children with lower SEMs (range: 0.18 to 0.19y). The lateral elbow system was more precise than the OAOSS in both cohorts. The precision of skeletal maturity systems varies across anatomic regions. Staged, single-parameter systems (eg, PHOS, Sanders Hand, OAOSS, and CAOSS) may correlate less with other systems than those with more parameters. Level III-retrospective study.