Background: Deltoid fibrosis is caused by congenital disorder or complication of intramuscular injection or trauma, and can affect aesthetics and functions of shoulders. Objectives: To remark on the risk factors and pathology of deltoid fibrosis, and to evaluate the results of surgical procedure. Subjects and method: This clinical study involved 156 patients with 281 shoulder joints were surgically treated at National Hospital of Pediatrics from August 1994 to June 2005. All patients were physical and radiological examinations, and surgically treated by 1 of 4 techniques. Postoperative outcomes were evaluated. Results and Conclusion: Of 156 patients, there were 72 male and 84 female children, 62.8% in age group of 11-15 years old, and 29.5% over 15 years old. Severity of deltoid fibrosis was: severe in 95.4% of shoulder joints, moderate: 4.6%, and mild: 0%. 12.2% patients experienced deltoid fibrosis in combination with fibrosis of another muscles. The postoperative outcomes included; good: 92.5% of shoulder joints, moderate: 2.9% and bad: 4.6%. Type IV technique give best results (99%).
Deltoid Muscle/ surgery ; Child ;

Diffuse-type giant cell tumor is relatively rare than localized giant cell tumor. Moreover, diffuse type giant cell tumor is common in intraarticular area, rarely occurs at intramuscular or subcutaneous layer. We experienced 1 case of giant cell tumor within the deltoid muscle. So we report this case with review of the literatures.
Deltoid Muscle* ; Giant Cell Tumors* ; Giant Cells*

PURPOSE: The objective of this study was to examine the effect of vibration exercises generated from an XCO® trainer on supraspinatus, infraspinatus, teres minor, and deltoid muscle thickness. METHODS: Thirty subjects were evenly divided into two groups. Muscle thickness was measured by a sonogram prior to the study, and at three and six weeks after the intervention. Changes in muscle thickness were analyzed using a repeated measure analysis of variance (ANOVA). The significance level for the statistical test was set at α=0.05. RESULTS: A statistically significant differences in timing, interactions between timing and the groups, and between-group changes were demonstrated for supraspinatus muscle thickness (p < 0.05). A similar finding was reported for infraspinatus, teres minor, and deltoid muscles with regard to the interactions between timing and the groups (p < 0.05), although the between-group change did not reach statistical significance (p>0.05). CONCLUSION: Significant changes were observed in the thickness of the supraspinatus, infraspinatus, teres minor, and deltoid muscles, owing to the use of vibration exercises generated from an XCO® trainer. These findings can be used as a foundation for future studies on rehabilitation training.
Deltoid Muscle ; Exercise* ; Rehabilitation ; Shoulder* ; Vibration*

This is a case report of oculocraniosomatic neuromuscular disease with "ragged-red fibers". The patients is 36 years old female who is revealing slowly progressive ptosis, external ophthalmoplegia, general weakness and mild right hemiparesis and hemianesthesia. The EMG findings are suggestive of diffuse myopathic process and the frozen muscle specimen from the left deltoid muscle shows the characteristic "ragged-red fibers" with classical myopathic changes.
Adult ; Deltoid Muscle ; Female ; Humans ; Neuromuscular Diseases* ; Ophthalmoplegia ; Paresis

This is a case report of oculocraniosomatic neuromuscular disease with "ragged-red fibers". The patients is 36 years old female who is revealing slowly progressive ptosis, external ophthalmoplegia, general weakness and mild right hemiparesis and hemianesthesia. The EMG findings are suggestive of diffuse myopathic process and the frozen muscle specimen from the left deltoid muscle shows the characteristic "ragged-red fibers" with classical myopathic changes.
Adult ; Deltoid Muscle ; Female ; Humans ; Neuromuscular Diseases* ; Ophthalmoplegia ; Paresis

Measurements of local shoulder muscle function during shoulder abduction are of a great interest in biomechanics research and in ergonomic applications. There have been so many opinions that the supraspinatus muscle acts in synergy with the deltoid muscle as a single unit throughout the shoulder abduction. However the specific actions of deltoid and supraspinatus muscles have been subjects of controversy. Electromyography is an established evaluation method of biomechanical study. It reflects the electrical activity at the muscle membrane level and indirectly the mechanical output of the muscle. The purpose of this study was to evaluate the role of deltoid and supraspinatus muscles during shoulder abduction by the comparison of motor unit action potentials using a quantitative electromyographic analysis method, to provide a good insight into the biomechanics of shoulder abduction. Motor unit action potentials of deltoid muscle were seen earlier than those of supraspinatus muscle at the time of initiation of shoulder abduction. The Root Mean Square (RMS) voltage of deltoid muscle was increased gradually from 0o to 90o of shoulder abduction, and then decreased gradually above 90o to 180o of shoulder abduction. The RMS voltages of deltoid muscle were significantly higher than those of supraspinatus muscle at each degree of shoulder abduction wholly. There was no differences in the RMS voltages of deltoid muscle, during shoulder abduction between the loading of 1 kg and without loading. However, the RMS voltages of supraspinatus muscle were significantly higher in the loading state than without loading. The Mean Rectified Voltages (MRV) were similar to the RMS voltages of deltoid and supraspinatus muscles during shoulder abduction. Based on these results, we concluded that the deltoid muscle was not only an initiator but also a major contributor in shoulder abduction, where as the supraspinatus muscle acts as a secondary muscle for the initiation of shoulder abduction and a supporting muscle when there is a resistance against shoulder abduction.
Action Potentials ; Deltoid Muscle ; Electromyography ; Membranes ; Muscles* ; Shoulder*

The low rate repetitive nerve stimulation test(RST) using the electric stimulation has been known the best procedure among the electroliagnostic evaluations for the neuromuscular transmission. However, the electric stimulation often causes a considerable discomfort and pain during the procedure. On the contrary, the magnetic stimulation is much easier and less painful in activating to activate the deep seated nerves. The purpose of this study was to compare the effect of repetitive magnetic and electric stimulation for the induction of compound muscle action potentials(CMAP) of abductor digiti quinti and deltoid muscles in 25 healthy subjects. The results were showed there were no significant differences in the amplitudes of CMAP of axillary and ulnar nerves between the magnetic and electric stimulations. And there were no significant differences in the decremental ratio of CMAP between the magnetic and electric stimulations. The magnetic stimulations were less painful for the subjects than electric stimulations in both proximal and distal muscles. In conclusion, the magnetic stimulation proved to be a useful method for repetitive nerve stimulations in the diagnosis of neuromuscular disease.
Deltoid Muscle ; Diagnosis ; Electric Stimulation ; Muscles ; Neuromuscular Diseases ; Ulnar Nerve

Several authors have made efforts to define the position of the axillary nerve within deltoid muscle and to calculate the so called safe area for this nerve but it still remains a matter of debate. The primary aim of the study was to investigate the acromio-axillary (AA) distance and its correlation with upper arm length. The secondary aim was to re-define the safe area for axillary nerve within deltoid muscle. Sixty shoulders of thirty adult human cadavers were dissected using standard methods. The distance from the anterior and posterior edge of acromion to the upper border of the course of the axillary nerve was measured and recorded as anterior and posterior AA distance respectively. Correlation analysis was done between the upper arm length and AA distance for each limb. The ratios between anterior and posterior AA distance and upper arm length were calculated and mentioned as anterior index and posterior index, respectively. The mean of anterior and posterior AA distance was 5.22 cm and 4.17 cm, respectively. The mean of upper arm length was 29.30 cm. The means of anterior index and posterior indices were 0.18 and 0.14, respectively. There was a significant correlation between upper arm length and both the anterior and posterior AA distance. The axillary nerve was found to lie at variable distance from the acromion. The minimum AA distance was found to be 3.50 cm. So this should be considered as the maximum permissible length of the deltoid split. Upper arm length has strong correlation with both anterior and posterior AA distances. The ideal safe area for the axillary nerve was found to be a quadrangular area above it and the size of which depends on the length of the upper arm.
Acromion ; Adult ; Arm ; Cadaver* ; Deltoid Muscle* ; Extremities ; Humans ; Shoulder

OBJECTIVE: To investigate the activities of upper trapezius and deltoid muscles in shoulder abduction in full can and empty can position in rotator cuff tear patients. METHOD: Twelve subjects with right rotator cuff tear patients participated in this study. Each subject performed scapular plane abduction with humeral external rotation (full can position) and with humeral internal rotation (empty can position). Electromyography (EMG) was recorded with surface electrodes at the both upper trapezius, anterior, lateral, and posterior deltoid muscles during shoulder abduction. The EMG activity of each muscle was normalized according to the highest EMG activity during a maximum manual muscle test for the corresponding muscle. RESULTS: Muscle activities of the lesion side's upper trapezius and lateral deltoid were significantly greater than those of the normal side in full can position. In empty can position, the activities of upper trapezius, anterior, and lateral deltoid increased in lesion side. In comparison between full can and empty can exercises, over 30degrees abduction arcs, empty can exercise showed increased muscle activities of upper trapezius and all deltoid muscle in lesion side. In contrast, anterior and lateral deltoid only showed increased in the muscle activities under empty can exercise in sound side. CONCLUSION: Rotator cuff tear is involved in changed the activities of upper trapezius and deltoid muscles. And these results suggested that in rotator cuff tear patients, the changed pattern of muscle contraction should be considered in shoulder exercise.
Anesthetics, Local ; Deltoid Muscle ; Electrodes ; Electromyography ; Exercise ; Humans ; Lidocaine ; Muscle Contraction ; Muscles ; Rotator Cuff ; Shoulder ; Tears

Amputees ; Deltoid Muscle/surgery* ; Humans ; Muscle, Skeletal ; Nerve Transfer ; Quality Control ; Upper Extremity/surgery*