著者
吉村 英哉 望月 智之 宗田 大 菅谷 啓之 前田 和彦 秋田 恵一 松木 圭介 中川 照彦
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.31, no.2, pp.217-219, 2007 (Released:2008-01-30)
参考文献数
10

Previous studies reported a presumably unusual bony attachment of the pectoralis minor muscle. However, less attention has been given to the insertion of the continuation to the glenohumeral joint. The purpose of this study was to evaluate the frequency of this abnormal insertion of the pectoralis minor muscle, and also to investigate the relation between this continuation and the capsule. 81 anatomic specimen shoulders from 41 cadavers were dissected. The insertion of the pectoralis minor tendon to the glenohumeral joint was carefully investigated. The pectoralis minor tendon ran beyond the coracoid process and extended to the superior portion of the glenohumeral joint in 28 out of 81 specimens (34.6%). The continuing insertion divided the coracoacrominal ligaments into two limbs. The continuation was more variable, and consisted of the whole tendon in 6, the middle part in 5, the lateral part in 15, and the medial part in 2 specimens. Furthermore, the pectoralis minor tendon inserted to the posterosuperior border of the glenoid in 6, to the greater tuberosity in 7, and both to the glenoid and the greater tuberosity in 15 specimens. The prevalence of the anomalous insertion of the pectoralis minor tendon revealed to be as high as 34.6% in the present study. This may suggest that the pectoralis minor tendon plays an important role in the stability of the glenohumeral joint.
著者
筒井 廣明 山本 龍二 安楽 岩嗣 三原 研一 今里 有紀彦 保刈 成
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.15, no.1, pp.13-17, 1991-09-01 (Released:2012-11-20)
参考文献数
11

The shoulder joint is the most mobile joint in the body combined with a small glenoid and a large humeral head. This joint has been thought to be an unstable joint because of its anatomical structure and the recurrence rate from initial dislocations. Our opinion of this joint is that it has most distinguished stabilizing mechanisms for keeping a wide range of motion.1. The first stabilizing mechanismThis mechanism is the bony combination of the radius between the glenoid cavity and the humeral head. The anatomical study showed the radius of a cross section of the glenoid was 16.8 mm and of the humeral head 22 mm. The computation of the maximum permissible kinetic vector that enables the humeral head to be on the glenoid was 43°.2. The second stabilizing mechanismThe second mechanism is the function of the anterior capsule including the inferior glenohumeral ligament.The anterior capsule works involuntary in both its tension and direction as the centripetal force does against the shear force.3. The disadvantages of these two stabilizing mechanismsThe disadvantages of these two stabilizing mechanisms are; - Inefficiency against the increased anterior kinetic vector during the positioning of the upper extremities vertically against the glenoid- The decrease of bony structural intensity compared with other joints such as the hip joint.4. The third stabilizing mechanismThe third stabildzing mechanism is the function of the shoulder girdle.Its first function is the mobility of the scapula working as shock ab s orber against the share force that falls on the glenohumeral joint.The second is the function of the shoulder girdle muscles such as the pectoralis major and the deltoid.In conclusion, therefore, a normal shoulder joint should be the most distinguished joint with these stabilizing mechanisms physically and anatomically maintaining a wide range of motion.
著者
立入 久和 森原 徹 仲川 春彦 木田 圭重 祐成 毅 堀井 基行 久保 俊一 三浦 雄一郎 福島 秀晃 黒川 正夫
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.35, no.3, pp.719-722, 2011 (Released:2011-12-21)
参考文献数
9
被引用文献数
3

Shrug exercise, which is one of the treatments for stiff shoulder and rotator cuff tear, is commonly performed. This exercise is also performed to relax the shoulder after surgery for rotator cuff repair. The effectiveness of shrug exercise for the rotator cuff has not been analyzed. The purpose of this study was to analyze the shrug exercise and to evaluate the usefulness of the shrug. Five asymptomatic male volunteers who had no history of shoulder abnormalities were examined. SSP (supraspinatus) muscle was measured by fine-wire electrodes and ISP (infraspinatus) muscle was measured by surface electrodes. At the time of non-shrug (group N) and shrug (group S), %MVC (maximal voluntary contraction) was calculated in the position of 0, 30, 60, 90 degrees flexion. %MVC of SSP in the position of 0,30,60,90 degrees flexion were 2,8,13,15% in group N, and 32,35,23,32% in group S. %MVC of SSP were increased at each angle. %MVC of ISP were 6,16,25,38% in group N, and 10,17,25,42% in group S. It has been reported that %MVC over 20% is high activity. %MVC of SSP showed over 20% at shrug position in this study, which was considered that shrug motion caused eccentric contraction of SSP muscle with the scapula elevating. From this study, it is considered that shrug excise is useful for cuff training, but may be overloaded on SSP in the early stage after surgery.
著者
田中 直史 大沢 正秀 夫 猛 大槻 伸吾 大久保 衞
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.20, no.1, pp.91-96, 1996-10-15 (Released:2012-11-20)
参考文献数
10

PURPOSEWe have reported that there are scapulo-humeral rhythms in the horizontal planes with flexion and extention of the shoulder joint as well as with the elevation of arms and decrease in movements of scapulo-thoracic joint by ageing. Now we wish to propose that there also exists a scapulo-humeral rhythm in the rotation of the shoulder.SU BJECTS AND METHODSWe measured the scapular inclination in seven normal volunteers ranged from 23 to 37(mean: 31), using an X-CT and setting it at a neutral position with the shouldes in abduction 0 ° and flexion 0° and the elbow in flexion 90 ° . The scapular inclinations were measured:1)from neutral to 30° and the maximal rotatio nal position (internal and external)2)at neutral and 30 ° rotation (internal and external) when maximal rota tion isotonic motion were performed.
著者
板寺 英一 市川 徳和 山川 晴吾 橋詰 博行 井上 一
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.24, no.3, pp.383-385, 2000-09-30 (Released:2012-11-20)
参考文献数
8

We studied the MRI findings of a frozen shoulder in three different phases. Forty-one frozen shoulders were available for this study. The mean age of the patients was 58 years (range,43 to 77 years). The mean range of elevation of the shoulders was 118 degrees (range,80 to 140 degrees). There were 10 shoulders in the acute phase (less than 2 months),16 in the subacute plase (2 to 3 months),15 in the chronic phase (4 to 12 months). Oblique coronal, oblique sagittal, and axial sequences were made with the fast spin-echo technique using a 0.5-tesla MR Vectra unit. On T2-weighted images, high signal intensities (HIS) in the glenohumeral joint (GHJ), the subacromial bursa (SAB) and the bicipital groove (BG) were analyzed, and then the contraction of the axillary pouch was evaluated.HIS at the GHJ was moderate in 40%, slight in 20% and none in 40% of the shoulders in the acute phase; in 0%, in 63% and in 37%, respectively, in the subacute phase; and in 7%, in 40% and in 53%, respectively, in the chronic phase. HIS at the SAB was moderate in 0%, slight in 30% and none in 70% of the shoulders in the acute phase; in 0%, in 25% and in 75%, respectively, in the subacute phase; and in 0%, in 27% and in 73%, respectively, in the chronic phase. HIS at the BG was moderate in 30%, slight in 60% and none in 10% of the shoulders in the acute phase; in 25%, in 19% and in 56%, respectively, in the subacute phase; and in 13%, in 40% and in 47%, respectively, in the chronic phase. Contraction of the axillary pouch was observed in 20% of the shoulders in the acute phase,69%in the subacute phase, and 73% in the chronic phase.In conclusion, there were increased amounts of fluid at the GHJ and BG in the acu, t eb upt haosnely a small amount at the SAB. Shoulder stiffness may be caused by contraction of the GHJ capsule which develops as the intraarticular synovitis resolves.
著者
南 昌孝 森原 徹 大西 興洋 加太 佑吉 祐成 毅 古川 龍平 木田 圭重 琴浦 義浩 藤原 浩芳 久保 俊一
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.41, no.2, pp.541-544, 2017 (Released:2017-09-20)
参考文献数
8

胸郭出口症候群(TOS)は,上肢のしびれや放散痛が生じる疾患である.投球時に同様の症状を訴える野球選手をしばしば経験するが,その疫学や病態は明らかでない.高校野球検診でTOSと診断された選手の疫学と病態を検討した.検診に参加した選手のうち,投球時に上肢のしびれや放散痛を自覚しWright testが陽性の選手をTOSの疑いありとした.そのうち病院を受診した選手の病態を検討した.TOSを疑われた選手は305名中13名であり,5名が病院を受診した.5名の身体所見は,肩甲骨の運動不良3例,胸椎のアライメント不良3例であった.すべての選手に運動療法を行い,2ヵ月以内に症状は消失した.野球選手のTOSは,筋の過緊張やリリース時の牽引などが原因とされている.今回経験した5例では筋の過緊張や肩甲骨下方偏位に加え,胸椎のアライメント異常が影響していると考えた.それらを改善することで症状は消失した.
著者
林田 賢治 中川 滋人
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.29, no.2, pp.427-430, 2005-06-30 (Released:2012-11-20)
参考文献数
6
被引用文献数
1

The aim of this study was to elucidate the relation between ball speed in pitching during a baseball game and the power of external rotation (ER) of the shoulders. Nineteen games, which were at the national inter high school baseball tournament games in Japan, in which the pitchers threw more than 100 times, and the ER strength before the tournament and after the games were measured, were included in the present study. The straight balls were decided by the ball speed data and video tapes of the games and a mean straight ball speed in the first 30 pitches and the last 30 were calculated. The relation between the changes of ball speed and ER strength were assessed. In 8 of 19 games, the ball speed decreased more than 3 km/h between the first 30pitches and the last 30 pitches and these games were classified into speed decreased game (DG), and the other 11 games were into non DG. The mean ratios of ER strength of the throwing side to the non throwing side were 1.02 in non DG and 0.99 in DG before the tournament. The mean ratios of ER power were 1.02 in non DG and 0.95 in DG after the games. The differences of ER ratios between before the tournament and after the game were +0.012 in non DG and -0.041 in DG, and a statistical significant difference was recognized between them. A decrease of straight ball speed during a game relates to a decrease of ER strength ratio. Maintaining ER strength could be one of the ways to keep ball speed in the game.
著者
繁田 明義 内山 善康 橋本 紘行 持田 讓治 新福 栄治 大見 博子
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.35, no.3, pp.907-910, 2011 (Released:2011-12-21)
参考文献数
16
被引用文献数
3

Many studies have reported treatment effects of H2 receptor antagonists (H2RA) on calcific tendinitis (CT) of the shoulder. The purpose of this retrospective study is to compare the clinical outcome between the cimetidine and the famotidine of CT of the shoulder. We studied 72 patients with CT of the shoulder who were closed with H2RA (cimetidine or famotidine) and loxoprofen sodium from 2005. They were treated as follows, 41 with cimetidine and loxoprofen (group C) (14 males, 27 females, average age 54.3 years old) 17 with famotidine and loxoprofen (group F) (10 males, 7 females, average age 58.4 years old) and 14 with loxoprofen(group N) (8 males, 6 females, average age 60.2 years old). Shoulder joint pain was assessed by using visual analogue scale (VAS), and the site and size of calcium deposits were calculated by X-rays (frontal view and scapula Y). In addition, influences of the complicating diseases (diabetes mellitus and hypertension) were evaluated for treatment effects. Groups C and F improved their pain and decreased calcium deposit size more than group N (p<0.05). However, the pain and calcium deposit size was not significantly different between group C and group F. Diabetic patients reduced the effectiveness more than non-diabetic patients in groups C and F. Hypertensive patients reduced the reduction ratio of calcium deposit more than non- hypertensive patients in groups C and F. There were the same clinical results for both cimetidine and famotidine for the CT of the shoulder. Diabetes mellitus and hypertension inhibited the treatment effects of H2RA.
著者
戸野塚 久紘 菅谷 啓之 高橋 憲正 河合 伸昭 中島 亮 寺谷 威 真鍋 博規 安藤 晃 森石 丈二
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.35, no.3, pp.877-881, 2011 (Released:2011-12-21)
参考文献数
13
被引用文献数
1

The purpose of this study is to determine a target ROM (T-ROM) at 3 months after arthroscopic rotator cuff repair, by which patients can expect eventual full recovery. Subjects consist of 209 shoulders in 202 patients, including 116 males and 86 females with an average age of 61.5 years old, who underwent primary arthroscopic rotator cuff repair and were followed-up for a minimum of 2 years. There were 30 partial-thickness tears, 120 small to medium and 57 large to massive full-thickness tears. Anterior elevation (AE), external rotation at side (ER), and internal rotation (IR) ROM at 3 month after surgery (ROM-3M) were measured, and divided into five groups according to the values. The final ROM at 24 months after surgery was compared with each ROM-3M of these subgroups in order to determine the T-ROM. Then, according to the T-ROM, patients were also divided into two groups: less than the T-ROM (AE-, ER-, and IR-); and more than the T-ROM (AE+, ER+, and IR+), and average ROM in each group were compared with each other. The final ROM of AE was significantly better in the group of more than 120° than less than 120 degrees. Therefore, the T-ROM of AE was determined as 120°. Similarly, those of ER and IR were determined as 10° and L5 level. ROM at 6 and 9 months in the AE+ group was significantly better than those of the AE- group. Further, every ROM at 3 to 24 months in the ER+ group was significantly better than those of the ER- group. In conclusion, ROM at 3 months after surgery affects final shoulder function. Surgeons and therapists should pay attention to the T-ROM at 3 months after surgery described above in order to maximize patients's final shoulder function.
著者
幸田 仁志 甲斐 義浩 来田 宣幸 山田 悠司 三浦 雄一郎 福島 秀晃 竹島 稔 森原 徹
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.43, no.2, pp.548-551, 2019 (Released:2019-09-18)
参考文献数
13

地域在住高齢者を対象に,腱板断裂,肩痛の自覚症状,他覚症状のそれぞれの有無により健康関連QOLを比較検討した.地域在住高齢者363名を対象とした.測定項目は,超音波診断による腱板断裂,アンケートによる肩痛の自覚症状,impingement signによる他覚症状の有無,SF-8の下位尺度およびサマリースコアとした.統計解析はMann-Whitney の U 検定を用い,それぞれの陽性群と陰性群で健康関連項目を比較した.肩痛の自覚症状の陽性群は,身体機能,日常役割機能(身体),体の痛み,全体的健康感,活力,身体的健康感が有意に低値を示した.他覚症状の陽性群は,身体機能,体の痛み,全体的健康感,活力,身体的健康感が有意に低値を示した.腱板断裂の有無では,いずれの項目にも有意差は認められなかった.地域在住高齢者の健康関連QOLには,腱板断裂の有無は直接的に関与せず,肩痛の自覚症状や他覚症状によって低下することが示唆された.
著者
甲斐 義浩 幸田 仁志 山田 悠司 三浦 雄一郎 福島 秀晃 竹島 稔 来田 宣幸 森原 徹
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.43, no.2, pp.411-414, 2019 (Released:2019-09-18)
参考文献数
12

本研究では,肩関節の総合的な柔軟性を得点化できる肩複合柔軟性テストを考案し,そのテスト法の信頼性と妥当性について検討した.対象は,健常若年者43名,健常高齢者252名,肩病変を有する高齢者111名とした.肩複合柔軟性テストは,外転,内転,外旋,内旋,複合テストの5項目で構成される.各テストには,4段階(0, 1, 2, 3)の判定基準を設定し,5項目の合計得点を0~15点で算出した.分析の結果,本テストの判定一致度(k係数:0.81-1.00)および合計得点(ICC:0.91)ともに,優秀な検者間信頼性が確認された.また,合計得点と肩甲上腕関節可動域との間に有意な正相関が認められた.対象者の合計得点は,健常若年者:12.5 ± 1.7点,健常肩高齢者:10.4 ± 2.5点,病変肩高齢者:8.7 ± 2.8点であり,病変肩群の得点は他の2群と比べて有意に低かった(p < 0.01).これらの知見より,肩関節の総合的な柔軟性を得点化できる尺度として,本法の信頼性と妥当性が示された.
著者
森澤 豊 野口 政隆 川上 照彦 山本 博司 貞廣 哲郎
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.22, no.2, pp.267-269, 1998-06-25 (Released:2012-11-20)
参考文献数
3
被引用文献数
1

We studied the mechanism of musculocutaneous neuropathy associated with the Boytchev procedure in cadavers.(Materials and methods)The subjects we re 21 adult cadavers (42 shoulders) for anatomical study. The distance from the anterior end of the coracoid process to the site of the entry of the musculocutaneous nerve trunk into the coracobrachialis muscle was determined as A, the distance to the insertion of the short head of the biceps among the nerve branches as B, and the distance to the coracobrachialis insertion site as C. Then, the coracoid process (served to measure the insertion of the short head of the biceps and that of the coracobrachialis) was returned to its original position beneath the full-thickness of the subscapularis muscle by the original Boytchev method, and the distance from the anterior end of the coracoid process to the lower margin of the subscapularis was determined as D.(Results)A was 47.5±13.2mm, B was 30.1±6.2mm, C was 33.9±7.5mm and D was 33.3±5.3mm. A was below D, i. e., the entry site of the musculocutaneous nerve trunk was above the lower margin of the subscapularis muscle, and entrapment of the musculocutaneous nerve trunk by the subscapularis muscle was present in nine shoulders (21.4%).(Discussion)In patients where the site of the entry of the musculocutaneous nerve trunk into the coracobrachialis muscle is at a higer position than the lower margin of the subscapularis, it appears necessary to take technical precautions such as passing the severed coracoid process through the lower one third of the belly of the subscapularis.
著者
森原 徹 小椋 明子 立入 久和 久保 俊一 黒川 正夫 三浦 雄一郎 福島 秀晃
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.35, no.3, pp.715-718, 2011 (Released:2011-12-21)
参考文献数
8
被引用文献数
3

In the motion of shoulder flexion(0-90 degree), the scapula was upward rotated at the center of acromioclaviclular joint. In the abduction, the scapula was upward rotated and depressed with the clavicle elevation and retraction. The purpose of this study is to evaluate the muscle functions around the scapula by electromyographic analysis during the flexion and abduction of the shoulder. EMG activities of upper, middle, and inferior trapezius muscle, and serratus anterior, were examined in 5 static positions from 0 degrees to 150 degrees for 5 seconds in each position during exercises of shoulder flexion and abduction in 6 healthy volunteers. We used Telemyo System 2400(Noraxon USA Inc) and analyzed by MyoVideo and MyoResearch. The relative activity of upper trapezius muscle did not increase, and the muscle activity of serratus anterior was increased significantly during the early phase of flexion. The relative activity of upper, middle trapezius muscle has gradually increased during the early phase of abduction. The scapular upward rotation pattern was different between that in flexion and abduction. This study indicated that the symptom of accessory nerve palsy is disorder of abduction, and the main symptom of long thoracic nerve palsy is the inhibition of shoulder flexion.
著者
大泉 尚美 末永 直樹 吉岡 千佳 山根 慎太郎 呉屋 五十八
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.43, no.2, pp.619-625, 2019

近年,ノンセメントステムを用いた人工肩関節置換術ではin-growthステムやショートステムによるradiolucent line (RLL)や骨吸収の減少が期待されている.本研究では,2005-2017年に人工肩関節置換術を施行した105肩を使用機種(スタンダードon-growthステム,スタンダードin-growthステム,ショートin-growthステム)と術式(人工骨頭置換術(HHR),解剖学的全人工肩関節置換術,リバース型全人工肩関節置換術(RSA))別に7群に分類し,術後1年の単純X線にてRLL,ステム先端の骨硬化,spot welds,ステム周囲の骨吸収(Inoue分類Grade 4)を調査した.HHRでは,ショートステムで有意にspot welds出現率が高かった.RSAでは,ショートステムで有意にRLL出現率が低く,spot welds出現率が高かった.骨吸収の出現率は,いずれの術式でも各群間に有意差はなかった.ショートステムでは早期にステム近位の骨のingrowthが得られていた.骨吸収はingrowthステム,ショートステムいずれでも減少は見られず,stress shielding以外の要因が関与している可能性も考えられた.
著者
星野 傑 中川 照彦 佐藤 哲也 八百 陽介 土屋 正光
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.39, no.2, pp.577-579, 2015

上腕骨骨頭骨折に対し骨釘移植による再接合術が有用であった1例を経験した.オートバイのロードレーサーである20歳男性がレース中に転倒し左肩を受傷,左上腕骨骨頭骨折に対し受傷後8週で肘頭から採取した骨釘および吸収性スクリューを準用し骨接合術施行.術後3年経過し,MRI像にて一部限局した壊死部分を認めるものの骨頭壊死なく骨癒合得られ,痛みなく良好な結果が得られた.
著者
名越 充 橋詰 博行 小西池 泰三 廣岡 孝彦 内田 圭治
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.32, no.3, pp.665-667, 2008 (Released:2008-11-21)
参考文献数
4

Calcified tendinitis is a common shoulder disease accompanied with severe pain. We experienced many cases of calcified tendinitis over some short periods in a year. We examined the correlation between the occurrence of calcified tendinitis and seasons. 212 patients (males 72, females 140) with acute calcified tendinitis visited to 12 hospitals during two years (January. 2005-December. 2006) in the Chugoku and Shikoku area were investigated. The average age was 57.1 years old. The day of the 1st medical examination and the numbers of cases were examined. The correlation between the occurrence and 4 seasons (March-May, June-August, September-November, December-February) and the correlation in the occurrences between each areas were statistically analyzed. The correlation between the occurrence and seasons was not seen (Wilcoxon signed-rank test). In winter, the mean value of the number of cases of calcified tendonitis tended to be fewest. There was a strong correlation in occurrence between the Sanyo West and Shikoku Setouchi areas (Spearman correlation coefficient ; 0.53997, P=0.0065). More cases and analysis in various points of view are needed for evidence of the correlation between the occurrence and season.
著者
吉松 俊紀 吉松 俊一 斎藤 明義 龍 順之助
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.30, no.3, pp.369-373, 2006-08-18 (Released:2012-11-20)
参考文献数
10

The aim of this study was to identify the features of isokinetic shoulder and trunk muscle strength of volleyball attackers with shoulder problems and to compare them with those of baseball pitchers.18 competitive high school volleyball attackers and 16 competitive high school baseball pitchers were studied.6 of the attackers and 7 of the pitchers were suffering from shoulder pain but the other players had no history of shoulder pain. The tests were conducted using a Biodex system 3 multi-joint dynamometer. The shoulders were tested for their flexion and extension muscle strength on the scapula plane and trunk muscle strength were tested for their flexion, extension and torso-rotational strengths. The results were compared between the normal group (N-G)and the shoulder injured group (S-G) and also between the attackers and the pitchers. We observed weakness of shoulder flexion strength in S-G of both athletes and the flexion to extension muscle strength ratio was significantly lower in S-G of the attackers. We also noticed the decline of trunk torso rotation to shoulder extension muscle strength ratio in the same group. In comparisons between the attackers and pitchers of N-G, trunk flexion to extension muscle strength ratio of attackers was significantly higher. The reason of the above results, we assumed that the force created from lower extremities was used for jumping in volleyball, while in baseball, it is used for pitching. We also considered that force required for spiking is created from the trunk in volleyball. Characteristics of shoulder muscle strength as dynamic stabilizer are similar in both volleyball and baseball. Appropriate proximal kinetic chain rehabilitation for the leg, hip and trunk should be selected in accordance with the characteristics of sports activities to prevent shoulder injuries. Especially for volleyball attackers, trunk muscle training is a prerequisite to prevent shoulder injuries.
著者
石井 壮郎 宮川 俊平
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.35, no.3, pp.939-943, 2011 (Released:2011-12-21)
参考文献数
12
被引用文献数
1

There were two purposes for this study. One was to identify risk-factors on dynamics which affected humeral head abnormality on MRI using logistic regression analysis. The other was to simulate stress distribution in humeral head at maximum external rotation (MER) of throwing phase using Finite Element Method analysis (FEM). Then we evaluated the validity of the simulation using MRI findings of humeral head abnormality. The subjects were 18 asymptomatic collegiate baseball players who took part in both MRI and pitching motion analysis. The shoulder joint reaction force was calculated using multi-body dynamics analysis with musculoskeletal model analyzed from foot contact to ball release of pitching motion. We did logistic regression analysis to identify whether the force was a risk-factor or not. As a result, the risk-factor of humeral head abnormality on dynamics was the shoulder joint reaction force (shearing force) at the acceleration phase. We simulated the stress distribution in the humeral head at MER using FEM model and input the shoulder reaction force. Stress distribution in the simulation was almost the same as that of humeral head abnormality in MRI. This simulation is expected to be a useful predictor of the humeral head abnormality caused by internal impingement of throwing shoulder injury.
著者
渡辺 幹彦 藤巻 悦夫
出版者
日本肩関節学会
雑誌
肩関節 (ISSN:09104461)
巻号頁・発行日
vol.23, no.3, pp.367-372, 1999-09-30 (Released:2012-11-20)
参考文献数
6

The purpose of this study was to clear the clinical results of conservative treatment including the correct pitching form and operative treatments.51 baseball players were studied. Their average age was 22. ly. o. Conserative treatment group including the correct pitching form which in the divided into 7steps and proceeded from the wrist to the foot. Elevating the arm and keeping the scapular plane with the forearm pronated and rotating the trunk on the hip joint were most important. Almost all of the cases had contracture in flexion and adduction of the shoulder.19 cases had problems besides the shoulder and scapula.24 baseball players could play as well as before injury. But players with an injured labrum tear and a partial thickness tear of the rotator cuff could not.10 baseball players had arthoscopic treatment including repair of BLC lesions (Biceps tendon/labrum comlex). Average age was 22 y. o.7 cases had BLC lesions and 8 cases had partial thickness joint side tears. Debridment of the labrum and rotator cuff were performed and repaired BLC lesion with the ROC fastener system in 5 cases.7 cases could play as well as before and all the this cases treatment with repaired BLC recovered completely. Thus we recommend this treatment.