Medial Epicondylar Fragment Research Articles

Outcome of Conservative Treatment for Medial Epicondylar Fragmentation before Epiphyseal Closure in Young Baseball Players

Outcome of Conservative Treatment for Medial Epicondylar Fragmentation before Epiphyseal Closure in Young Baseball Players

Stand-up test could be a helpful adjunct for screening elbow disorders in Little League baseball players

BackgroundThe purpose of this study is to justify the result of the modified Stand–Up test (MSUT) in Little League baseball players and to clarify the association with sports related disorders in the elbow. MethodsA total of 245 (240 boys and 5 girls) Little League baseball players aged 9 to 12 underwent physical examination, elbow ultrasonography and questionnaires during a routine medical checkup. In addition, the MSUT, based on the Japanese Orthopaedic Association (JOA)'s original Stand–Up test to evaluate the risk of Locomotive syndrome, was performed. ResultsSeventeen osteochondritis dissecans (OCD) of capitellum and 4 medial epicondylar fragmentation (MEF) cases were diagnosed with ultrasonography in 242 players. Based on the MSUT, five boys could not stand up from 40 cm platform with the single leg stance, two of whom complained of current elbow pain, three of whom diagnosed with a positive finding with ultrasonography. Odds ratio (95% confidence limits) of risk factors for failing to the 40 cm-MSUT with the single leg stance were: incidence of current elbow pain 5.7 (0.9–35.5); OCD (Grade 1b and 2) 8.2 (0.8–83); and MEF 19.5 (1.7–230). ConclusionTwo percent of Little League baseball players were unable to stand up from a 40 cm high platform/stool with the single leg stance by the MSUT and it was associated with an increase in MEF or OCD diagnosis by ultrasonography and presence of elbow pain. These results suggest that players who failed to the 40 cm-MSUT with the single leg stance are at risk of elbow disorders. Also, these results are consistent with previous research on throwing injuries that have associated poor control in the legs or trunk with pain and injury involving the upper extremities. MSUT, a relatively simple procedure, may be a helpful adjunct for screening to estimate readiness for resuming general physical activity in Little League baseball players.

High elasticity of the flexor carpi ulnaris and pronator teres muscles is associated with medial elbow injuries in youth baseball players

ABSTRACT Objectives The purpose of the present study was to measure the elasticities of the forearm flexor-pronator muscles in youth baseball players and examine their relationships with medial elbow injuries. Methods We examined the strain ratios (SR) of the flexor digitorum superficialis (FDS), flexor carpi ulnaris (FCU), and pronator teres (PT) in 89 youth baseball players with medial epicondylar fragmentation (injury group) and in 142 healthy baseball players (control group). An index of muscle elasticity was determined using ultrasound strain elastography. The SR of each muscles was compared between the injury and control groups, and the SR of the both side arms was compared within group. Moreover, multivariable logistic regression analyses were conducted to examine the association of forearm muscle elasticity with medial elbow injuries. Results The SR of the FCU and PT of the throwing arm were significantly higher in the injury group than in the control group (both P < .001). In the injury group, the SR of the FCU was higher in the throwing arm than in the non-throwing arm (P < .001), but no difference was noted for the PT. Multivariable logistic regression analyses showed that a 0.1 increase of the SR of the FCU of the throwing arm (odds ratio [OR] 1.30, 95% confidence interval [CI] 1.14–1.48) and PT of the throwing arm (OR 1.41, 95% CI 1.19–1.67) and the non-throwing arm (OR 1.31, 95% CI 1.12–1.54) was significantly associated with an increased prevalence of medial elbow injuries. Conclusion High elasticities of the FCU of the throwing arm and PT of both the arms were observed in individuals with medial elbow injuries, and were associated with increased prevalence of medial elbow injuries. These findings may be characteristic of medial elbow injuries in youth baseball players.

High Thoracic Kyphosis and Backward Trunk Inclination Angles in the Single-Leg Standing Position Associate With Medial Elbow Injuries in Youth Baseball Players: A Cross-Sectional Study.

Baseball pitching is a coordinated movement involving the spine. A previous study indicated that increased thoracic kyphosis angle in a standing position was a risk factor for medial elbow injuries in youth baseball players. However, spinal alignments in single-leg standing and their relationships with medial elbow injuries, scapular alignment, or hip joint range of motion are unclear. To examine the difference in spinal alignment between standing and single-leg standing positions in youth baseball players and analyze their relationship with elbow injuries, scapular alignment, or hip joint range of motion. Cross-sectional study. University laboratory. There were 51 youth baseball players with medial epicondylar fragmentation (medial elbow injury group) and 102 healthy youth baseball players (control group). Thoracic kyphosis, lumbar lordosis, and trunk inclination angles during standing and single-leg standing, forward scapular posture, and hip joint range of motion. In the single-leg standing position, the thoracic kyphosis and backward trunk inclination angles were significantly higher in the medial elbow injury group than in the control group (P = .016 and P = .046, respectively). In the standing position, no significant difference was observed between both groups. The thoracic kyphosis angle in single-leg standing was positively correlated with the bilateral forward scapular posture in the medial elbow injury (P = .008 and P < .001 on the throwing and nonthrowing sides, respectively) and control (P = .010 and P = .032 on the throwing and nonthrowing sides, respectively) groups. High thoracic kyphosis and backward trunk inclination angles are characteristics during single-leg standing in youth baseball players with medial elbow injuries. Spinal alignment measurement in single-leg standing may be useful for identifying youth baseball players who are at risk for sustaining medial elbow injury.

Outcome of conservative treatment for medial epicondylar fragmentation before epiphyseal closure in young baseball players

Outcome of conservative treatment for medial epicondylar fragmentation before epiphyseal closure in young baseball players

Elasticity of the pronator teres muscle in youth baseball players with elbow injuries: evaluation using ultrasound strain elastography

Although the pronator teres muscle, a major dynamic stabilizer of elbow valgus stress during throwing, frequently presents stiffness, its relationship with elbow injuries in youth baseball players is unknown. This study investigated the relationship between the elasticity of the pronator teres muscle and elbow injuries in youth baseball players. The strain ratio (SR) of 15 individuals with osteochondritis dissecans of the humeral capitellum (OCD group), 67 individuals with medial epicondylar fragmentation (medial injury group), and 115 healthy individuals (control group) was measured as the index of the elasticity of the pronator teres muscle using ultrasound strain elastography. In addition, the forearm and glenohumeral joint rotation range of motion was measured. The SR of the throwing arm was significantly higher in the OCD and medial injury groups than in the control group (both P <.001). In the OCD group, the SR was significantly higher in the throwing arm than in the nonthrowing arm (P <.001), whereas in the medial injury group, there was no significant difference between both arms. The glenohumeral joint external rotation range of motion of the throwing arm was moderately negatively correlated with the SR (r = -0.478, P <.001). Stiffness of the pronator teres muscle was exhibited only in the throwing arm of individuals with OCD and in both arms in individuals with medial elbow injury. These findings may contribute to an accurate evaluation and prevention of elbow injuries in youth baseball players.

Radiological and Functional Outcome of Medial Epicondyle Fracture Treated Surgically in Children and Adolescents: A Retrospective Study.

Purpose: Fractures of the medial humeral epicondyle represent approximately 10% of all pediatric elbow fractures. Surgically treated pediatric fractures of the medial humeral epicondyle were analyzed retrospectively for their epidemiological, clinical, radiological and surgical parameters. The evaluation includes the Mayo elbow performance score (MEPS).Methods: Twenty-five surgically treated fractures of the medial humeral epicondyle were analyzed. A valgus stress test was performed under general anesthesia or sedation. All patients underwent open reduction internal fixation using a similar technique. The medial epicondylar fragment was anatomically reduced and fixed in all cases with screws and Kirschner wires. At final evaluation, union was assessed radiologically, and elbow function was assessed by MEPS.Results: An evaluation of all our patients after a mean follow-up of 8.75 months (SD=4.76) after initial surgery was possible. The mean age of patients at the time of injury was 10.8 years (SD=2.3). Fifteen (60%) dominant elbows were injured in our study and twelve (48%) elbows had an associated elbow dislocation. On examination in the operating room post anesthesia, all the elbow injuries revealed some degree of valgus instability. All our patients (n=25) showed good to excellent results in MEPS. Radiographically, union was achieved in all cases. Three patients developed postoperative ulnar nerve neuropraxia; all recovered at time of final follow-up.Conclusion: Our results suggest that open reduction internal fixation of displaced medial epicondyle fractures leads to satisfactory motion and function. A valgus stress test in the operating room can reveal the true nature of joint instability that can warrant operative stabilization of medial epicondylar injuries.

Clinical Results of Surgically Treated Medial Humeral Epicondylar Apophyseal Avulsion Injury in Children and Adolescent.

Introduction: Fractures of the medial humeral epicondyle represent approximately 10% of all paediatric elbow fractures. Objective of our study was to assess treatment outcomes of children and adolescent with medial epicondylar fracture of the elbow using standard operative protocols.&#x0D; Methods: 20 surgically treated fractures of the medial humeral epicondyle were analysed &amp; reviewed for their epidemiological, clinical and surgical parameters. A valgus stress test was performed under general anesthesia or sedation. All patients underwent open reduction internal fixation using a similar technique. The medial epicondylar fragment was anatomically reduced and fixed in all cases with screws, Kirshner wires or tension band wiring. At final evaluation, union (radiologically) and elbow function [MAYO elbow performance score (MEPS)] was assessed.&#x0D; Results: An evaluation of all of our patients after a mean follow-up of 8.75 months (SD=4.76) after initial surgery was possible. The mean age of patients at the time of injury was 10.8years (SD=2.3). Fifteen (75%) dominant elbows were injured in our study and 12(60%) elbows had an associated elbow dislocation. On examination in operating room post anaesthesia, all of the elbow injuries revealed some degree of valgus instability. All of our patients(n=20) showed good to excellent results in the MAYO elbow performance score (MEPS). Radiographically, union was achieved in all cases. Three patients developed postoperative ulnar nerve neuropraxia, all recovered at time of final follow up. One patient developed mild lateral heterotrophic ossification but did not require any additional surgical intervention.&#x0D; Conclusion: Our results suggest that open reduction internal fixation of displaced medial epicondyle fractures leads to satisfactory motion and function. A valgus stress test in operating room can reveal the true nature of joint instability that can warrant operative stabilization of medial epicondylar injuries.

Characteristics and prognosis of medial epicondylar fragmentation of the humerus in male junior tennis players

Although medial epicondylar fragmentation of the humerus is a reported elbow injury in junior tennis players, there have been only a few studies on this entity, and none have investigated the characteristics and prognosis of medial epicondylar fragmentation. Forty-one male junior tennis players, aged 11 to 14 years (mean, 13 years), underwent elbow examination by ultrasonography. Elbow re-examination was performed in subjects with medial epicondylar fragmentation at an average of 20 months (12-30 months) after the initial examination. On examination, 9 subjects (22%) had elbow pain. Ultrasonography showed that 6 subjects (15%) had medial epicondylar fragmentation, all of whom had elbow pain. Medial epicondylar fragmentation was present in 5 (38%) of 13 subjects aged 11 to 12 years and in 1 (4%) of 28 aged 13 to 14 years. More subjects aged 11 to 12 years had medial epicondylar fragmentation (P = .0084). All 6 subjects with medial epicondylar fragmentation continued to play tennis between the initial elbow examination and the re-examination. At re-examination, although ultrasonography showed that 5 developed bone union and 1 had nonunion, 3 subjects (50%) reported elbow pain. Our results demonstrated that subjects aged 11 to 12 years had a high frequency (38%) of medial epicondylar fragmentation. Although medial epicondylar fragmentation was the main cause of elbow pain (67%) at the initial elbow examination, all 6 players with medial epicondylar fragmentation continued to play tennis between the initial elbow examination and the re-examination. At re-examination, 5 subjects presented spontaneous bone union (83%), but 3 subjects (50%) reported elbow pain.

Back to Play the Nonsurgical Way: Treatment of Medial Epicondylar Fragmentation in Young Throwers

Back to Play the Nonsurgical Way: Treatment of Medial Epicondylar Fragmentation in Young Throwers

Outcome of Nonoperative Treatment for Humeral Medial Epicondylar Fragmentation Before Epiphyseal Closure in Young Baseball Players

Background: Nonoperative treatment for humeral medial epicondylar fragmentation in baseball players, involving prohibition and limitation of throwing, has been reported to give good results. However, in some cases, such nonoperative treatment fails to yield an acceptable outcome. Hypothesis: In nonoperative treatment for patients with medial epicondylar fragmentation, achievement of bone union of the fragmentation provides better clinical outcomes compared with those of patients with delayed bone union or nonunion. Study Design: Cohort study; Level of evidence, 3. Methods: Fifty-five young baseball players with medial epicondylar fragmentation before epiphyseal closure, aged between 9 and 13 years (mean, 11.0 years), participated in this study. They belonged to baseball teams in a youth league and underwent nonoperative treatment involving prohibition of throwing for an average of 2.0 months and subsequent limitation of throwing for an average of 1.8 months. We investigated whether achievement of bone union of the fragmentation was associated with better clinical outcomes. Results: Bone union was achieved in 40 (73%) of 55 participants at 6 months after initial presentation, 31 (76%) of 41 participants at 1 year, and 32 (94%) of 34 participants at 2 years. Elbow pain was present in 7 participants (17%) at 1 year after initial presentation and in 6 participants (18%) at 2 years. At 1 year after initial presentation, statistical analysis showed that most participants with elbow pain had significant fragmentation (P = .0055). At 2 years after initial presentation, there was no significant relationship between elbow pain and medial epicondylar fragmentation (P = .32). Statistical analysis also showed that, at both 6 months and 1 year after initial presentation, bone union was significantly delayed in most participants who had not accepted nonoperative treatment and consequently resumed throwing vigorously before bone union. Conclusion: At 1 year after initial presentation, bone union of the medial epicondylar fragmentation was correlated with a decreased prevalence of elbow pain. At 6 months and 1 year after initial presentation, delayed bone union of the medial epicondylar fragmentation was associated with resumption of throwing at maximum strength before bone union had occurred.

Iatrogenic Radial Nerve Injury With Cannulated FixationofMedial Epicondyle Fractures in the PediatricHumerus

Surgical treatment for medial epicondylar fractures is controversial, and indications depend on variety of variables, including the degree of displacement and future goals of the patient. If surgery is to be performed, typically open reduction of the medial epicondylar fragment, with visualization of the ulnar nerve, and fixation is undertaken. Pins, screws, and cannulated screws have all been described for fixation. The use of cannulated screw systems, especially when coupled with fluoroscopy, has many advantages, and is generally considered a safe way to place a screw accurately while minimizing the surgical exposure. Unfortunately, there are also inherent risks with a cannulated screw system that often go unrecognized, such as guide pin bending, breakage or unrecognized advancement. The complications are rarely reported, and recognition is critical to avoid future complications. This is the first study to report a radial nerve injury after the use of cannulated screw systems in 2 patients with a pediatric medial epicondyle fracture fixation. This study highlights the danger of these systems for this fracture fixation, and we discuss the potential techniques to avoid this complication. Our purpose in publishing this series of cases is to shed light on a complication, in the hope that its exposure will help prevent such complications in the future. IV, Case Series.

Risk factors for elbow injuries among young baseball players

There are some risk factors that could predispose a young baseball player to elbow injuries. Study participants were 294 baseball players aged 9 to 12 years old. A questionnaire, physical examination, and ultrasound imaging to investigate elbow injuries were performed. Data for the groups with and without elbow injuries were analyzed statistically using multivariate logistic regression models. Ultrasound imaging showed that 60 participants had elbow injuries, including medial epicondylar fragmentation in 58 and osteochondritis dissecans of the capitellum in 2. The odds ratio (95% confidence interval) of the risk factors that statistical analysis showed were significant were age older than 11 years, 2.82 (1.30-6.10); height exceeding 150 cm, 2.02 (1.07-3.82); pitching, 4.50 (2.42-8.37); daily training, 1.96 (1.02-3.79); range of motion (ROM) of external rotation of the shoulder below 130 degrees , 1.98 (1.01-3.87); muscle strength (MS) of external rotation of the shoulder exceeding 80 N, 4.11 (1.47-11.55); and MS of internal rotation of the shoulder exceeding 100 N, 2.04 (1.08-3.90). Risk factors for elbow injuries are age, height, pitcher, days of training, grip strength, range of motion of external rotation of the shoulder, and muscle strength of the shoulder. As new information, our results suggest that decrease of ROM of external rotation of the shoulder and increase of MS of external and internal rotation of the shoulder predispose elbow injuries.

Displaced medial epicondyle fractures of the humerus: surgical treatment and results. A report of 139 cases

Elbow instability is a common feature after medial epicondyle fractures, displaced or not, even in the absence of dislocation. Undisplaced or minimally displaced fractures often have an underestimated degree of instability secondary to unrecognised capsuloligamentous and muscular injuries. The purpose of this retrospective study was to analyze and to assess objectively the results of the surgical treatment of these acute injuries. One hundred and thirty-nine displaced medial epicondyle fractures were surgically treated and reviewed. A valgus stress test was performed on each child under general anesthesia or sedation. Functional outcome was assessed using a scoring system based on a series of clinical and radiographic criteria. The mean age of patients at the time of accident was 11.9 years. Mean follow-up was 3.9 years. All fractures had associated with instability of the elbow. A posterolateral elbow dislocation was associated in 80 fractures. The medial epicondylar fragment was anatomically reduced and fixed in all cases. The final result was excellent in 130 cases and good in 9 cases. Elbow were stable and pain free in all patients. Normal elbow range of motion was reported in 133 cases. Union was achieved in all cases. Among these cases, nine had presented a <<fibrous>> union with no change on valgus stress views. No cases of cubitus valgus >/=10 degrees were observed. Anatomical abnormalities of the elbow were present in 28 cases: periarticular calcification in 18 cases, medial condyle groove formation in 4 cases, moderate hypertrophy and fragmentation of the medial epicondyle, respectively, in 3 cases. The positive valgus stress test performed at the time of surgery for all epicondyle fractures without associated dislocation regardless of there degree of displacement justified our operative approach. Operative intervention is a good management of these fractures and results in an anatomic reduction, a solid bone union and prevents valgus instability. Even with postoperative immobilization of the elbow (mean of 4 weeks), stiffness is rare. Damage to the medial stabilizing structure of the elbow rather than the extent of medial epicondyle displacement has a far greater influence on joint stability and outcome.

Using Sonography for the Early Detection of Elbow Injuries Among Young Baseball Players

The aim of this study was to determine the usefulness of sonography for detecting elbow injuries among young baseball players. One hundred fifty-three volunteers ranging in age from 9 to 12 years and belonging to youth baseball teams participated. Sonography of the elbow was performed in the field when baseball exercises were being conducted. We analyzed the relationship between elbow pain and sonographic abnormalities and the relationship between pitchers and sonographic abnormalities. Sonography showed that 33 subjects had medial epicondylar fragmentation and two had early-stage osteochondritis dissecans of the capitellum. In 25 subjects who agreed to further examination and treatment, radiography confirmed the sonographic findings. All of the 23 subjects with medial epicondylar fragmentation, who stopped throwing, obtained union of the bone and returned to baseball. The two subjects with osteochondritis dissecans of the capitellum underwent surgery before the osteochondral fragment became loosened. Sonographic abnormalities correlated with episodes of elbow pain. Pitchers statistically significantly had sonographic abnormalities. Sonography in the field can provide an opportunity to detect and treat elbow injuries before they become more advanced.

Spontaneous reduction of a fractured medial epicondylar fragment

Spontaneous reduction of a fractured medial epicondylar fragment