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

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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

中川 滋人 米田 稔 瀧内 敏朗 宮崎 義雄

雑誌

日本整形外科スポーツ医学会雑誌 = Japanese journal of orthopaedic sports medicine (ISSN:13408577)

巻号頁・発行日

vol.19, no.3, pp.43-48, 1999-09-30

参考文献数

12

被引用文献数

4

著者

中川 滋人 林田 賢治 米田 稔 山本 隆文

出版者

日本肩関節学会

雑誌

肩関節 (ISSN:09104461)

巻号頁・発行日

vol.21, no.3, pp.413-417, 1997-08-31 (Released:2012-11-20)

参考文献数

13

被引用文献数

2

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The purpose of this study was to clarify the mechanism of rotator cuff tears seen in baseball players.Forty baseball players who injured their shoulders through repetitive throwing and underwent shoulder arthroscopy were studied retrospectively using a videotaped arthroscopic tour. They ranged in age from 13 to 48 years (average: 24 years) and were classified into 3 groups according to the rotator cuff findings: articular-side partial rotator cuff tear (APRCT)in Group 1 (29 patients), cuff inflammation only in Group 2 (5 patients), and intact cuff in Group 3 (6 patients). The existence and the site of rotator cuff tears, labral tears and notches of the greater tuberosity were examined in each group.All APRCTs were located around the posterior aspect of the supraspinatus tendon (SSP) and the anterior aspect of the infraspinatus tendon (ISP). Localized splits of the posterior rotator interval were recognized in 5 patients. In most of the other patients in Group 1, the deepest APRCT was also located in the posterior rotator interval. Posterior-superior labral fraying was seen in 22 patients (17/29 in Group 1,0/5 in Group 2, and 5/6 in Group 3). However, posterior labral lesions localized to the superior portion were only recognized in 4 patients in Group 1 and SLAP lesions were combined with this posterior lesion in 5 patients. The remaining 8 patients in Group 1 had labral fraying of the whole posterior portion. A notch of the greater tuberosity around the insertion of the ISP was recognized in 23 players, which showed it had a significant relationship to cuff lesions (21/29 in Group 1,2/5 in Group 2, and 0/6 in Group3).The most significant APRCTs were located around the posterior rotator interval between the SSP and ISP. APRCTs caused by repetitive throwing activity may be initiated by tearing between the SSP and ISP due to an eccentric or shearing force. They were not always associated with posterior-superior labral lesions as predicted by the internal impingement theory.

著者

中川 滋人 小室 透 福島 直 小畠 昌規 宮崎 義雄 米田 稔

出版者

日本肩関節学会

雑誌

肩関節 (ISSN:09104461)

巻号頁・発行日

vol.27, no.3, pp.567-570, 2003-10-30 (Released:2012-11-20)

参考文献数

11

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The purpose was to investigate the efficacy of several diagnostic methods to detect superior labrum injuries in throwing shoulder. Fifty-four throwing athletes, who underwent arthroscopic surgery, were prospectively studied. There were superior labrum injuries in twenty-four cases and loose attachment of the superior labrum in six. The efficacy of preoperative diagnostic methods were investigated comparing them with arthroscopic findings of superior labrum injuries. The forced shoulder abduction and elbow flexion test (forced abduction test) was diagnosed as positive, when pain at the postero-superior aspect of the shoulder in forced maximal abduction was reduced or diminished in elbow flexion. The most useful test to detect superior labrum injuries was the forced abduction test, and the sensitivity, specificity, and accuracy was 73%,69%, and 70%, respectively. Loose attachment of the superior labrum significantly increased false positive rate of this method. Forced abduction tests were simple and effective for diagnosis of superior labrum injuries in throwing shoulders.

著者

重野 陽一 福島 美歳 原田 憲正 石田 通暁 大西 純二 中川 滋人

出版者

日本関節病学会

雑誌

日本リウマチ・関節外科学会雑誌 (ISSN:02873214)

巻号頁・発行日

vol.9, no.4, pp.593-602, 1990

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The porous total knee replacement designed by Miller and Galante has been performed on 31 knees in 23 cases from November 1986 to June 1988 in the Kure National Hospital. We evaluated the postoperative results over an average follow-up period of 2.7 years (ranging from 2 to 3.6 years) on 6 knees in 4 men and 25 knees in 19 women, with ages ranging from 49 to 81 (average 69.0) . The original diseases were 5 cases of rheumatoid arthritis (7 knees) and 18 cases of osteoarthritis (24 knees) .<BR>Each knee was evaluated preoperatively and postoperatively by the functional evaluation score system proposed by the three universities. Preoperative and postoperative femoro-tibial angle, alignment of each component, degree of lateral displacement of the patella on the patellofemoral groove, occupancy ratio of the component to the tibial surface, amount of resection of the tibia, radiolucent line and sclerotic line adjacent to the component were investigated with roentgenograms.<BR>Postoperatively the clinical score improved from 36.9 to 80.3 points in rheumatoid knees and from 48.5 to 87.3 in osteoarthritic knees.<BR>In each case, the insertion angle of the components was close to ideal. The degree of lateral displacement of the patella was significantly decreased in cases with lateral retinacular release. The mean occupancy ratio of tibial component to tibial surface was 95.8% on A-P and lateral view X-rays, showing that the components used are small for the tibial surface. The mean resection of the tibia was 7mm from the surface of the lateral plateau in varus knees. Only 2 rheumatoid patients had radiolucent lines surrounding the tibial component. In 2 rheumatoid knees and 11 osteoarthritic knees there were sclerotic lines surrounding the pegs of the tibial components.<BR>In general, the short-term results of total knee replacement using this prosthesis were satisfactory. The long-term radiographic observation has shown that the choice of a tibial component of adequate size is mandatory to prevent the component from sinking.

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.3, pp.651-654, 2005-08-10 (Released:2012-11-20)

参考文献数

9

被引用文献数

4

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The aim of this study was to elucidate the relationbetween internal (IR) and external rotations (ER) strength of the shoulder and shoulder pain during throwing in high school baseball pitchers. Internal and external rotation strength of the shoulder were measured in 401 high school pitchers, who had attended the national inter high school baseball tournament in Japan, and the influence of internal and external rotation strength of shoulder on shoulder pain during the throwing were assessed. The average IR and ER strength were 105.3+/-32.2N and 93.1+/-28.3N. The average IR. ER, and ER/IR ratio were 1.18+/-0.22,0.98+/-0.14, and 0.92+/-027, respectively, in all pitchers. All pitchers were classified into two groups. The pain experienced group (P group), which involved the pitchers who had experienced shoulder pain during throwing prolonged more than one month within the year, included 40 pitchers, and the other group (NP group) included 361 pitchers. The IR, ER, IR ratio, ER ratio, and ER/IR ratio were compared between both groups. The ER/IR ratio of the P group was lower than that of the NP group, with a statisticaldifference by unpaired student t-test (p=0.02). Pitchers with a low ER/IR ratio tend to injure their throwing shoulder and proper ER/IR ratio could be one of important condition for throwing shoulders.

著者

中川滋人

雑誌

肩関節

巻号頁・発行日

vol.28, pp.333-337, 2004

被引用文献数

2 1

著者

中川滋人

雑誌

MB Orthop

巻号頁・発行日

vol.10, pp.19-24, 1997

被引用文献数

1