Shoulder MRI evaluation of the association of os acromiale with supraspinatus and infraspinatus injury / 中国骨伤

OBJECTIVE@#To explore the MRI findings of os acromiale and to analyze the relationship between os acromiale and the supraspinatus and infraspinatus injury.@*METHODS@#From January 2010 to August 2020, 21 patients with os acromiale (os arcomiale group) were compared with 21 subjects with no evidence of os acromiale (no os arcomiale group). There were 14 males and 7 females in the os arcomiate group, aged from 29 to 77 years old, mean aged (55.5±11.5) years old. While in the control group, there were 10 males and 11 females in no os arcomiale group, aged from 31 to 70 years old, mean aged (51.1±10.0) years old. The os acromiales were classified as edematous os acromiale or non-edematous os acromiale based on whether the presence of marrow edema, and as displaced os acromiale or non-displaced os acromiale based on whether the presence of displacement of the os acromiale. The MRI features of os acromiale were analyzed. Statistical analyses were performed to identify the differences between the os arcomiale group and no os arcomiale group regarding rotator cuff tear, supraspinatus and infraspinatus injury. Differences in the supraspinatus and infraspinatus tear between the edematous and non-edematous os acromiale group, the displaced and non-displaced os acromiale group, the displaced os acromiale and no os arcomiale group were also assessed.@*RESULTS@#On MRI, all the 21 os acromiales appeared as a triangular or irregular bone fragment of the distal acromion, and forms a pseudo-acromioclavicular joint with the acromion. Eleven cases were edematous os acromiale, 11 cases were displaced os acromiale. In the os arcomiale group, 17 had supraspinatus tear, 1 had supraspinatus tendinitis, 11 had infraspinatus tear, and 4 had infraspinatus tendinitis. In the no os arcomiale group, 11 had supraspinatus tear, 2 had supraspinatus tendinitis, 5 had infraspinatus tear, and 1 had infraspinatus tendinitis. No statistically significant difference between the os arcomiale group and no os arcomiale group regarding the rotator cuff tear, supraspinatus and infraspinatus injury (P>0.05). In the 11 cases of edematous os arcomiale, 10 had supraspinatus tear and 7 had infraspinatus tear. In the 10 cases of non-edematous os acromiale, 7 had supraspinatus tear and 4 had infraspinatus tear. No statistically significant difference was noted between the edematous os acromiale and non-edematous os acromiale in terms of supraspinatus and infraspinatus tear (P>0.05). In the 11 cases of displaced os acromiale, 11 had supraspinatus tear and 9 had infraspinatus tear. In the 10 cases of non-displaced os acromiale, 6 had supraspinatus tear and 2 had infraspinatus tear. In the no os arcomiale group, 11 had supraspinatus tear and 5 had infraspinatus tear. There was a statistically significant increases in the prevalence of supraspinatus and infraspinatus tear in the displaced os acromiale group compared with non-displaced os acromiale group, the displaced os acromiale group and no os arcomiale group(P<0.05).@*CONCLUSION@#Shoulder MRI can very well depict os acromiale and can reveal associated abnormalities such as adjacent bone marrow edema, displaced deformity, and rotator cuff tear, and it can be used to assess the stability of the os acromiale. The presence of os acromiale may not increase the risk of supraspinatus and infraspinatus tear significantly. However, the presence of displaced os acromiale is at greater risk of supraspinatus and infraspinatus tear.

Effectiveness of Ultrasound in Evaluation of Fatty Infiltration in Rotator Cuff Muscles

BACKGROUND: This study aimed to verify the diagnostic performance of Ultrasonography (US) in the evaluation of fatty infiltration (FI) in rotator cuff muscles and to analyze the diagnostic values of each measurement component.METHODS: The degree of FI in 108 shoulders was assessed by magnetic resonance imaging (MRI) and US. MRI findings were graded by the Goutallier classification. US findings were graded by the Strobel method. Agreement between MRI and US findings was evaluated. The sensitivity and specificity for detecting FI and intraobserver reliabilities were also assessed.RESULTS: US grading of the infraspinatus based on short-axis architecture showed good agreement (κ = 0.62). US grading-based on architecture showed good agreement for both supraspinatus and infraspinatus in long- and short-axis scans (supraspinatus, κ = 0.63; infraspinatus, κ = 0.68), while that based on echogenicity showed moderate agreement (supraspinatus, κ = 0.51; infraspinatus, κ = 0.50). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of detecting advanced FI were significant in both axes.CONCLUSIONS: US is effective for detecting advanced FI in the rotator cuff muscles. US can assess the infraspinatus more accurately than the supraspinatus, and architecture is a more decisive component of FI status than echogenicity.

Effect of Various Movements on Shoulder External Rotators / 中国康复理论与实践

Objective To investigate the activities of infraspinatus (IS) and posterior deltoid (PD) under shoulder external rotation at open kinetic chain (OKC) and closed kinetic chain (CKC) exercise with shoulder abduction 0° and 90° to determine the optimal external rotation rehabilitation exercise.Methods From April to June, 2018, 19 healthy adults finished the movement of 0° OKC, 0° CKC, 90° OKC and 90°CKC. The root mean square (RMS) of IS and PD was recorded with surface electromyography (sEMG), then the standardized RMS (RMS％), ratio of IS/PD and onset time of activation were calculated.Results RMS％ of PD was the minimal at 90° CKC, and was less than that of 0° CKC (P ＜ 0.05). IS/PD was the most at90° CKC, and was more than that of 90° OKC (P ＜ 0.05). The onset time of IS was the earliest in 90° CKC, and earlier than that of 90° OKC (P ＜ 0.05) and 0°OKC (P ＜ 0.05). The onset time of PD was the latest in 0° CKC, and latter than that of 90° OKC (P ＜ 0.05).Conclusion 90°CKC activates IS mostly and earliest, which can be used in early rehabilitation for rotator cuff injury.

Isolated infraspinatus atrophy due to suprascapular neuropathy presenting as abnormal shoulder posture

@#Isolated infraspinatus atrophy is rare and difficult to confirm based on physical examination, although external rotation lag signs may provide a clue to the diagnosis. We present a case of isolated infraspinatus weakness caused by suprascapular neuropathy presenting as abnormal shoulder posture.

Role of Magnetic Resonance Imaging in rotator cuff pathologies

Background: Stability to the shoulder joint which has great range of motility, is provided by the rotator cuff, the coraco-acromial arch and the glenoid labrum along with the capsule and glenohumeral ligaments. The common disorders involving the rotator cuff tendons include impingement, tendinopathies and tears. Magnetic Resonance Imaging (MRI) has good spatial resolution for identifying tendon edema and tears in the rotator cuff. Aim and objectives: To describe the MRI characteristics of rotator cuff pathologies. To describe the rotator cuff pathologies in terms of age, gender, symptomatology and predisposing factors among the study population. Materials and methods: The study was performed in the Department of Radiodiagnosis, NRI General Hospital, Chinakakani, Guntur from September 2015 to August 2017 and comprises of 100 patients with suspected rotator cuff pathologies who were referred for MRI shoulder. Results: The age distribution of patients with rotator cuff abnormalities was in the range of 21 and 74 years. The most commonly affected was supraspinatus tendon followed by subscapularis and infraspinatus tendons. Among the rotator cuff abnormalities the frequently encountered finding was tendinosis followed by partial tears. Conclusion: Magnetic Resonance Imaging is very useful in depicting rotator cuff disease in patients with painful, weak or stiff shoulder for prompt and accurate diagnosis.

Ultrasound-Guided Shoulder Injections / 대한정형외과학회잡지

The shoulder pain is one of the most common problems to orthopaedic surgeons in clinic. Among therapeutic modality used to manage this pain, joint and periarticular injection, as well as suprascapular nerve block, show good clinical outcome. Ultrasound guidance is a safe technique, increasing the safety and accuracy of the procedure and reducing complications. An accurate understanding of the surface anatomy is important in performing the ultrasound-guided shoulder injections. This article aims to describe the surface anatomy and sono anatomy of both the shoulder and the surrounding structures and also summarize different infiltration techniques and peripheral nerve blocks.

Isolated Suprascapular Neuropathy after Acupuncture

No abstract available.

Two Cases of Refractory Hiccups Effectively Treated with Acupuncture at the Lump of Infraspinatus Muscle (Terasawa Point) / 日本東洋医学雑誌

Hiccups can sometimes become intractable. We report two cases of hiccups in which acupuncture practices to the lump of the infraspinatus muscle (Terasawa point) were effective. Case 1 was an 85-year-old male, an inpatient with bacterial pleuritis. His hiccups had persisted for 11 days. Several pharmacotherapeutic approaches were partially effective, but the hiccups were not completely abolished. In situ acupuncture therapy to bilateral Terasawa points was done, and his hiccups disappeared the next day. Case 2 was a 68-year-old male. He experienced insufficient sleep due to hiccups. We inserted needles into bilateral Terasawa points and heated the surrounding area with an electrothermo-acupuncture device using a curved heating plate. When this combination therapy was done, his hiccups disappeared during treatment. Acupuncture at the Terasawa point is one of the therapeutic approaches for hiccups and a rapid effect can be expected.

Characteristics of Myofascial Pain Syndrome of the Infraspinatus Muscle

OBJECTIVE: To report the characteristics of myofascial trigger points (MTrPs) in the infraspinatus muscle and evaluate the therapeutic effect of trigger-point injections. METHODS: Medical records of 297 patients (221 women; age, 53.9±11.3 years) with MTrPs in the infraspinatus muscle were reviewed retrospectively. Because there were 83 patients with MTrPs in both infraspinatus muscles, the characteristics of total 380 infraspinatus muscles with MTrPs (214 one side, 83 both sides) were investigated. Specific characteristics collected included chief complaint area, referred pain pattern, the number of local twitch responses, and distribution of MTrPs in the muscle. For statistical analysis, the paired t-test was used to compare a visual analogue scale (VAS) before and 2 weeks after the first injection. RESULTS: The most common chief complaint area of MTrPs in the infraspinatus muscle was the scapular area. The most common pattern of referred pain was the anterolateral aspect of the arm (above the elbow). Active MTrPs were multiple rather than single in the infraspinatus muscle. MTrPs were frequently in the center of the muscle. Trigger-point injection of the infraspinatus muscle significantly decreased the pain intensity. Mean VAS score decreased significantly after the first injection compared to the baseline (7.11 vs. 3.74; p<0.001). CONCLUSION: Characteristics of MTrPs and the therapeutic effects of trigger-point injections of the infraspinatus muscle were assessed. These findings could provide clinicians with useful information in diagnosing and treating myofascial pain syndrome of the infraspinatus muscle.

Isolated Ruptures of the Infraspinatus: Clinical Characteristics and Outcomes

BACKGROUND: Isolated infraspinatus tear is very rare and clinical features are not as well known, therefore the purpose of this study was to evaluate clinical characteristics and outcomes of isolated infraspinatus tear that authors experienced. METHODS: Authors reviewed 288 cases of full-thickness rotator cuff tear involving infraspinatus between 2010 and 2015, and retrospectively analyzed six cases of isolated infraspinatus tear. Perioperative clinical characteristics, postoperative functional outcomes of 6 months were investigated. Functional evaluation included visual analogue scale (VAS), range of motions, American Shoulder and Elbow Surgeons (ASES) score, and Constant score. RESULTS: Calcific tendinitis was accompanied in 4 cases (66.7%). Three of them received steroid injection or aspiration or extracorporeal shockwave therapy. Mean preoperative pain VAS was 7.1 (range, 5–9), and mean postoperative pain VAS at 6 months later was 1.6 (range, 0–5). Preoperative muscle strength by isokinetic muscle performance test showed 52% deficit of abduction and 37.6% deficit of external rotation. All 6 patients had arthroscopic repair of the infraspinatus tendon. All the patients at the 6 months follow-up exhibited clinical improvement in the Constant score (67.8 [range, 45–77] to 89.3 [range, 81–100], p=0.029), and ASES score (52.3 [range, 30–77] to 90.0 [range, 80–100], p=0.002). There was no healing failure on imaging. CONCLUSIONS: Isolated infraspinatus tendon tear was frequently accompanied by calcific tendinitis, but pathophysiologic relationship should need more study. To rule out neurogenic etiology, magnetic resonance imaging and electromyography would be helpful. Arthroscopic infraspinatus tendon repair and supraspinatus debridement showed relatively good result in painful shoulder.

Isolated Ruptures of the Infraspinatus: Clinical Characteristics and Outcomes

BACKGROUND: Isolated infraspinatus tear is very rare and clinical features are not as well known, therefore the purpose of this study was to evaluate clinical characteristics and outcomes of isolated infraspinatus tear that authors experienced. METHODS: Authors reviewed 288 cases of full-thickness rotator cuff tear involving infraspinatus between 2010 and 2015, and retrospectively analyzed six cases of isolated infraspinatus tear. Perioperative clinical characteristics, postoperative functional outcomes of 6 months were investigated. Functional evaluation included visual analogue scale (VAS), range of motions, American Shoulder and Elbow Surgeons (ASES) score, and Constant score. RESULTS: Calcific tendinitis was accompanied in 4 cases (66.7%). Three of them received steroid injection or aspiration or extracorporeal shockwave therapy. Mean preoperative pain VAS was 7.1 (range, 5–9), and mean postoperative pain VAS at 6 months later was 1.6 (range, 0–5). Preoperative muscle strength by isokinetic muscle performance test showed 52% deficit of abduction and 37.6% deficit of external rotation. All 6 patients had arthroscopic repair of the infraspinatus tendon. All the patients at the 6 months follow-up exhibited clinical improvement in the Constant score (67.8 [range, 45–77] to 89.3 [range, 81–100], p=0.029), and ASES score (52.3 [range, 30–77] to 90.0 [range, 80–100], p=0.002). There was no healing failure on imaging. CONCLUSIONS: Isolated infraspinatus tendon tear was frequently accompanied by calcific tendinitis, but pathophysiologic relationship should need more study. To rule out neurogenic etiology, magnetic resonance imaging and electromyography would be helpful. Arthroscopic infraspinatus tendon repair and supraspinatus debridement showed relatively good result in painful shoulder.

Resultados de la electrólisis percutánea intratisular en el dolor en el hombro: infraespinoso, un ensayo controlado aleatorio / Résultats de l'Électrolyse Percutanée Intra-tissulaire contre la douleur de l'épaule: Muscle sous-épineux. Une étude contrôlée et randomisée / Results of the Electrolysis Percutaneous Intratissue in the shoulder pain: infraspinatus, A Randomized Controlled Trial

Background: The Electrolysis Percutaneous Intratissue (EPI®) is a novel technique that provokes a local inflammatory process, allowing the phagocytises and affected tissue to repair. Objectives: The work is aimed to: a) verify the effectiveness of the EPI® when there is shoulder pain, b) locate where the EPI® should be applied, c) and find the possible interaction between the trigger points and the tendon pain. Design: Randomized controlled trial. Setting: Institute of Physiotherapy and Sports. Method: A double randomized experimental longitudinal study was conducted on four groups of 10 people aged 34-47 years with pain in the shoulder. In the first study there were three intervention groups and a control group. In the second study, the group with the best results in the first study served as a control group. Measurements: The variables measured were the perceived pain and the restriction for abduction, internal and external rotation. Results: Although the three intervention groups improved respect to the control group when the EPI® was applied, the results show that the EPI® is more effective when it is applied in all detected trigger points and to tendon pain. Conclusions: The EPI® is more effective if applied in the infraspinatus muscle and the tendon than applied only to one of the two structures, when both structures have pain. Limitations: The study could have tested the involvement of different structures and its related biomechanical implications. It could have also considered more variables(AU)

Introducción: la electrólisis percutánea intratisular (EPI®) es una novedosa técnica que provoca un proceso inflamatorio local, que permite la fagocitosis y la reparación del tejido afectado. Objetivos: verificar la efectividad de la EPI® cuando hay dolor del hombro, b) localizar dónde debería ser aplicada la EPI® y C) y determinar la interacción entre los posibles puntos de activación y el dolor del tendón. Diseño: estudio controlado aleatorio. Ubicación: Instituto de Fisioterapia y el Deporte. Método: se realizó un estudio longitudinal experimental aleatorizado doble en cuatro grupos de 10 personas con edades entre 34-47 años que sufrían dolor en el hombro. En el primer estudio hubo tres grupos de intervención y un grupo de control. En el segundo estudio, el grupo que tuvo mejores resultados en el primer estudio sirvió como grupo de control. Mediciones: las variables que se midieron fueron dolor percibido y la restricción de la abducción, rotación interna y rotación externa. Resultados: aunque los tres grupos de intervención mejoraron respecto al grupo de control cuando se aplicó la EPI®, los resultados muestran que la EPI® es más eficaz cuando se aplica en todos los puntos de activación detectados y donde hay dolor en los tendones. Conclusiones: la EPI® es más eficaz si se aplica en el músculo infraespinoso y el tendón que si se aplica solo a una de las dos estructuras, cuando ambas presentan dolor. Limitaciones: el estudio podría haber probado la participación de diferentes estructuras y sus implicaciones biomecánicas relacionadas. Podría también haber tenido en cuenta más variables(AU)

Introduction: L'Électrolyse Percutanée Intra-tissulaire (EPI®) est une nouvelle technique qui produit une réaction inflammatoire locale permettant la régénération tissulaire du tendon, ligament, muscle, etc. Objectifs: Le but de ce travail est de, a) confirmer l'effectivité de l'EPI® lorsqu'il y a une douleur au niveau de l'épaule, b) localiser la région sur laquelle l'EPI® doit être appliqué, et c) trouver la possible interaction entre les points de stimulation et la douleur tendineuse. Dessin: Une étude contrôlée et randomisée. Lieu: Institut de physiothérapie et de sports. Méthode: Une étude randomisée, expérimentale et longitudinale de quatre groupes de 10 personnes, âgées de 34 - 47 ans et atteintes d'une douleur au niveau de l'épaule, a été réalisée. Dans la première étude, il y a eu trois groupes expérimentaux et un groupe témoin. Dans la deuxième étude, le groupe ayant les meilleurs résultats dans la première étude a servi de groupe témoin. Évaluations: Parmi les variables analysées, on peut trouver la perception de la douleur et la limitation de l'adduction et de la rotation interne et externe. Résultats: Quoique les trois groupes expérimentaux ont éprouvé une amélioration vis-à-vis le groupe témoin après l'application de l'EPI®, les résultats ont montré que cette technique est plus effective si elle est appliquée sur tous les points de stimulation détectés et contre la douleur tendineuse. Conclusions: L'EPI® est plus effective si elle est appliquée sur le muscle sous-épineux et les tendons que sur une seule de ces deux structures, quand toutes les deux sont douloureuses. Limitations: L'étude pouvait avoir examiné les différentes structures compromises et leurs implications biomécaniques associées. Elle pouvait avoir aussi considéré beaucoup plus de variables(AU)

<b>The Pathophysiological Mechanism of the Kyokyokuman : On the Relationship between Kyokyokuman and Tense Condition of Diaphragm</b> / 日本東洋医学雑誌

In the previous article, the author reported on the relationship between shinkahiko and transport points. However, acupuncture manipulation to these points never diminished fullness in the chest and hypochondrium (kyokyokuman). Thus the author searched a new lump of back muscles and finally discovered that the infraspinatus muscle is a critical point which is closely rerated with kyokyokuman. The author also discovered that this point improves hiccup. It is well known that this lump is present in patients with shoulder stiffness and so on. Some patients with kyokyokuman present this lump simultaneously. This report intends to clarify a kyokyokuman that appears related tense condition of diaphragm, by means of both two concrete clinical cases and fifteen cases discussing to the pathophysiological background of this phenomenon.

Estimation of role of ultrasound and MRI in the examination of shoulder joint.

Background: To recognize different pathologies affecting the shoulder joint with the help ultrasound and MRI scans and to evaluate the features, pattern and extension of the different pathologies affecting the shoulder joint with help of ultrasound and MRI scans so as to help the clinician for further management. Aim: To estimate role of ultrasound and MRI in examination of shoulder joint. Material and methods: Study comprised of an observational hospital based study. Out of 65patients, 20 underwent only ultrasound investigation, 25 underwent only MRI scans whereas 20 patients were evaluated by ultrasound and MRI. These were performed by 3-5 MHZ curvilinear probe and 8-10 MHZ linear probe on HD 7 and HD 9 Philips ultrasound machines and 1.5 T Philips MRI machine. MR arthrography was performed as a follow up in some of the patients in outside centre. Results: USG study also showed that the most commonly occurring rotator cuff tears were supraspinatus tears whereas alone infrspinatus and subscapularis tears were very rare. MRI study showed supraspinatus tears Were the most frequently occurring in the rotator cuff whereas subscapularis and infraspinatus tears were the most commonly occurring rotator cuff tears were supraspinatus tears whereas alone infraspinatus and subscapularis tears were very rare. MRI study showed supraspinatus tears were the most frequently occurring in the rotator cuff whereas subscapularies and infraspinatus tears were rare. MRI is 100% confirmative in almost all cases of Rotator cuff tears but may sometimes need extra imaging by MR arthrography in partial bursal tears. Conclusion: Rotator cuff tears are the most common pathologies affecting the shoulder joint according to this study. It was proved that, there is no evident difference in the accuracy of ultrasound and MRI in detecting this pathology, even though MRI has proved to be more accurate in evaluating almost all other pathologies as compared to ultrasound.

The usefulness of latissimus dorsi transfer for reconstruction for malignant fibrous histiocytoma in the infraspinatus muscle region: a case report / Utilidad de la transferencia del latissimus dorsi en la reconstrucción por histiocitoma fibroso maligno en la región muscular infraespinosa: reporte de un caso

Malignant fibrous histiocytoma (MFH) is a type of highly malignant soft tissue sarcoma with a predilection for the extremities of adults. We report a patient with MFH in the infraspinatus muscle for which wide resection including total resection of the infraspinatus muscle was performed, followed by transfer of the latissimus dorsi muscle for shoulder reconstruction in a onestage operation with good postoperative function.

El histiocitoma fibroso maligno (HFM) es un tipo de sarcoma del tejido suave, altamente maligno, con predilección por las extremidades de los adultos. Reportamos el caso de un paciente con HFM en el músculo infraespinoso, al cual se le hizo una amplia resección que incluyó la resección total del músculo infraespinoso, seguida de una transferencia del músculo latissimus dorsi para la reconstrucción del hombro, en una operación de una sola etapa con buena función postoperatoria.

Arthroscopic Stabilization Using Remplissage Technique in Recurrent Shoulder Instability with Large Hill-Sachs Lesion / 대한스포츠의학회지

The glenohumeral bone deficiency plays an important role in the failure of arthroscopic shoulder stabilization procedures. Recently, several authors have described more novel approaches to treat the engaging Hill-Sachs lesion. Presented the 'Remplissage' technique that consists of an arthroscopic posterior capsulodesis and infraspinatus tenodesis to fill the Hill-Sachs lesion in addition to an arthroscopic Bankart repair. We report an arthroscopic technique in recurrent shoulder instability with large Hill-Sachs lesion with posterior capsulodesis and infraspinatus tenodesis.

Arthroscopic Stabilization Using Remplissage Technique In Recurrent Shoulder Instability with Large Hill-Sachs Lesion: Minimum Six Months Follow-Up Results

PURPOSE: To evaluate shoulder stability, clinical, and functional results more than 6 months after utilizing the 'Remplissage' technique, consisting of an arthroscopic posterior capsulodesis and infraspinatus tenodesis, to fill Hill-Sachs lesions. MATERIALS AND METHODS: Seven patients were followed-up more than 6 months after the 'Remplissage' procedures performed in our hospital from August 2008 to August 2009. The mean age of the patients was 28.6 years and the mean follow-up time was 10 months. Evaluations included ROM, ASES score, KSSI score, ROWE score, and postoperative MRI. RESULTS: In a functional evaluation of the patients with an average postoperative time of 10 months, the ASES score improved from 51.4 preoperatively to 76.8 postoperatively, the KSSI score improved from 46.5 preoperatively to 76 postoperatively, and the ROWE score improved from 43.5 preoperatively to 76.3 postoperatively. After an average postoperative time of 10 months, the range of motion was nearly normal (>170 degrees in further flexion, and >45 degrees in external rotation). CONCLUSION: In recurrent shoulder instabilities with large Hill-Sachs lesions, the 'Remplissage' technique resulted in good outcomes in terms of shoulder stability, clinical, and functional results after postoperative times of more than 6 months.

Primary Repair in Tears Affecting Two or More Rotator Cuff Tendons

PURPOSE: The current study assessed the factors affecting outcomes of primary repair procedures in tears of multiple rotator cuff tendons. MATERIALS AND METHODS: Among the cases of rotator cuff tears involving two or more tendons receiving operations between 1997 and 2003, The clinical results of 19 cases with more than 2 years follow-up were evaluated by the UCLA score. We evaluated the correlation of trauma, active motion, acromiohumeral distance, tear size, and surface area with the UCLA score using Pearson's linear correlation coefficient (PLCC). RESULTS: UCLA scores increased significantly in all cases, from 9 to 26.1 on average. However, the results were good in 53%, and poor in 47% according to Ellman's criteria. Trauma, active elevation, acromiohumeral distance, and tear size did not correlate with the UCLA score, but the tear surface area was inversely correlated with the score (PLCC=- 0.696). Cases with degeneration of the infraspinatus muscle above Goutallier grade III on MRI showed worse results than cases with less degeneration. CONCLUSION: The clinical results of primary repair of rotator cuff tears involving multiple tendons were satisfactory in 53% of patients. Large tear surface area and severe degeneration of the infraspinatus were poor prognostic factors.

MORPHOLOGICAL AND STRENGTH CHARACTERISTICS OF THE ROTATOR CUFF AND DELTOID MUSCLES IN COLLEGIATE BASEBALL PLAYERS / 体力科学

The purpose of this study was to investigate the influence of a shoulder injury on rotator cuff muscle thickness and shoulder muscle strength in baseball players. Based on orthopedic medical checks performed by a doctor for 57 male collegiate baseball players, two groups, the pain-free normal group (NOR group, n=19) and the impingement test positive group (IMP group, n=17) volunteered to participate in the study. Muscle thickness of the supraspinatus, infraspinatus and posterior deltoid muscles was measured bilaterally using a B-mode ultrasound apparatus (SSD-500, Aloka) with a 5-MHz transducer. Isometric shoulder abduction strength was measured bilaterally with a hand-held dynamometer in the sitting position with the arm at 45 degrees abduction, and shoulder external and internal rotation strength were measured bilaterally with an isokinetic dynamometer in the sitting position with the upper arm at 90 degrees abduction.<BR>When the two groups were compared, the NOR group showed significantly greater values on the dominant side than on the non-dominant side for muscle thickness of the posterior deltoid. However, the IMP group showed significantly greater values on the non-dominant side than on the dominant side of muscle thickness of the supraspinatus, the muscle strength with the abduction and external rotation (300 deg/sec) and external internal rotation strength ratio (180 deg/sec) .<BR>Also, the IMP group had a significantly weaker dominant/non-dominant ratio of supraspinatus muscle thickness (p<0.05) and abduction strength than the NOR group (p<0.01) .<BR>These results suggest that baseball players with positive impingement show both a morphological and functional decline in the supraspinatus muscle. The dominant side supraspinatus weakness observed in the IMP group of this study may reflect muscle atrophy and chronic fatigue.

Suprascapular Nerve Injury Restricted to the Infraspinatus Muscle by a Ganglion Cyst: A case report

Suprascapular nerve injury restricted to the infraspinatus muscle is an uncommon condition. We present a 29 year-old man who complained of right shoulder pain and weakness for 8 months. Physical examination revealed atrophy of right infraspinatus muscle and T2 weighted MRI of the right shoulder revealed a mass with homogeneous high intensity at the spinoglenoid notch and atrophy of right infraspinatus muscle. EMG study revealed abnormal spontaneous activities and reduced recruitment pattern of motor units in right infraspinatus muscle. Symptoms improved after the excision of a mass which was a ganglion cyst by pathologic examination. We were reporting a case of suprascapular nerve injury restricted to the infraspinatus muscle.