JaLCDOI 10.18926/AMO/56376
FullText URL 72_6_583.pdf
Author Park, Se-Jin| Jeong, Hwa-Jae| Shin, Hun-Kyu| Park, Jai Hyung| Lee, Jaewook| Cho, Yongun| Lee, Seok Won| Murase, Tsuyoshi| Ikemoto, Sumika| Sugamoto, Kazuomi| Kim, Eugene|
Abstract We retrospectively evaluated the altered biomechanics of the talus in 15 adult patients (7 males, 8 females) with chronic lateral ankle instability when the ankle joint moved actively from full dorsiflexion to full plantarflexion under a non-weight bearing condition. CT images were taken for the unstable ankle and the contralateral normal (control) ankle. Three-dimensional surface models of both ankle joints were reconstructed from the CT data, and we used a computer simulation program to compare both ankle motions of inversion/eversion in the coronal plane, plantarflexion/dorsiflexion in the sagittal plane, and internal rotation/external rotation in the axial plane. This evaluation method provides in vivo, dynamic, and 3D results of ankle motion. In the ankles with chronic lateral instability and the controls, the average talar rotational movement of inversion (+)/eversion (−) was 19.0° and 15.5° and the internal rotation (+)/external rotation (−) was 30.4° and 20.7°, respectively. Paired t-tests revealed significant differences in the amount of inversion (+)/eversion (−) (p=0.012) and internal rotation (+)/external rotation (−) (p<0.001) between unstable and normal ankle joints. The difference of mean rotational movement in internal rotation (9.7°) was greater than that of inversion (3.5°). Rotational instability should be considered when evaluating chronic lateral ankle instability.
Keywords three-dimensional motion analysis chronic lateral ankle instability talus ankle joint
Amo Type Original Article
Published Date 2018-12
Publication Title Acta Medica Okayama
Volume volume72
Issue issue6
Publisher Okayama University Medical School
Start Page 583
End Page 589
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
Copyright Holders CopyrightⒸ 2018 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 30573913
NAID 120006545161
JaLCDOI 10.18926/AMO/54984
FullText URL 71_2_151.pdf
Author Kim, Eugene| Park, Jai Hyung| Han, Byeong-Ryong| Park, Hee Jin| Lee, So Yeon| Murase, Tsuyoshi| Sugamoto, Kazuomi| Ikemoto, Sumika| Park, Se-Jin|
Abstract The three-dimensional (3D) kinematics of the scapula were analyzed in vivo in 10 patients with scapular and 10 patients with clavicular fracture. Both the injured shoulder and normal contralateral shoulder were evaluated by computed tomography in the neutral and fully elevated positions. 3D rotational and translational movements of the scapula relative to the thorax during arm elevation were analyzed. A computer simulation program was used to compare rotational elevation/depression in the coronal plane, anterior/posterior tilting in the sagittal plane and protraction/retraction in the axial plane between the normal and affected sides. Anterior/posterior translational movement along the X-axis, upward/downward movement along the Y-axis, and lateral/medial movement along the Z-axis in the Euler space during forward elevation were also compared. In scapular fracture, rotational elevation of the scapula decreased in the coronal plane and posterior tilting of the scapula increased in the sagittal plane. Anterior and superior translation were higher in scapular fracture than in the corresponding normal sides. However, no significant abnormal rotational and translational kinematic changes were observed during elevation in clavicular fracture. In vivo 3D computerized motion analysis was useful for evaluating scapular dyskinesis. Scapular fracture can cause scapular dyskinesis, but not all clavicular fractures alter scapular motion biomechanics.
Keywords 3-dimensional motion analysis scapular dyskinesis fracture scapula clavicle
Amo Type Original Article
Published Date 2017-04
Publication Title Acta Medica Okayama
Volume volume71
Issue issue2
Publisher Okayama University Medical School
Start Page 151
End Page 159
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
Copyright Holders CopyrightⒸ 2017 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 28420897
JaLCDOI 10.18926/AMO/40509
FullText URL 64_5_331.pdf
Author Park, Se-Jin| Jung, Young-Bok| Jeong, Hwa Jae| Shin, Hun-Kyu| Jung, Ho-Joong| Lim, Jong-Jun| Yoon, Ji-Woong| Kim, Eugene|
Abstract Among patients that underwent total knee arthroplasty from June, 1990 to January, 1999, 61 cases (44 patients) that could be followed for more than 10 years were included in this study. The patients were divided into a patellar retention group and a patellar resurfacing group, and were compared with regard to their clinical and radiological outcomes. In patients undergoing primary TKA, a selective patellar resurfacing protocol was used. The indications for patellar retention were a small patella, nearly normal articular cartilage, minimal preoperative patellofemoral pain, poor patellar bone quality, and young patient age. When patellar retention was performed, osteophytes of the patella were removed and marginal electrocauterization was carried out. There were 25 cases (20 patients) in the patellar retention group and 36 cases (29 patients) in the patellar resurfacing group. The mean follow-up period was 140.7 months in the patellar retention group and 149.0 months in the patellar resurfacing group. The selective patellar resurfacing with total knee arthroplasty had a favorable outcome;there were a significant difference noted between the 2 groups in the functional scores, which showed better outcomes in the patellar resurfacing group than in the patellar retention group.
Keywords total knee arthroplasty (TKA) selective patellar resurfacing patellar retention patellar resurfacing
Amo Type Original Article
Published Date 2010-10
Publication Title Acta Medica Okayama
Volume volume64
Issue issue5
Publisher Okayama University Medical School
Start Page 331
End Page 338
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
Copyright Holders CopyrightⒸ 2010 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 20975767
Web of Sience KeyUT 000283563300009
JaLCDOI 10.18926/AMO/31821
FullText URL fulltext.pdf
Author Park, Shinsuk| Kim, Eugene|
Abstract <p>Conventionally, the carrying angle of the elbow is measured using simple two-dimensional radiography or goniometry, which has questionable reliability. This study proposes a novel method for estimating carrying angles using computed tomography that can enhance the reliability of the angle measurement. Data of CT scans from 25 elbow joints were processed to build segmented three-dimensional models. The cross-sectional centerlines of the ulna and the humerus were traced from the 3D models, and the angle between 2 vectors formed from the centerlines of the humerus and the ulna was defined as the &#34;three-dimensional carrying angle.&#34; These angles were compared with those measured by simple radiograph. Two cases of angular deformity were underwent surgery based on this preoperative surgical planning, and the postoperative 3D carrying angles were evaluated using the proposed method. The mean value of the calculated three-dimensional carrying angle was 20.7 degrees +/-3.61, while it was 16.3 degrees +/-3.21 based on simple radiography without statistical difference. Based on the 3D carrying angle estimations, 2 surgical cases of cubitus deformities were planned by comparison with the normal contra-lateral elbow. Postoperative angle estimations confirmed that the corrected angles were nearly identical to the planned angles for both cases. The results of this study showed that the carrying angle can be accurately estimated using three-dimensional CT and that the proposed method is useful in evaluating deformities of the elbow with high reliability.</p>
Keywords elbow carrying angle computed tomography
Amo Type Original Article
Published Date 2009-12
Publication Title Acta Medica Okayama
Volume volume63
Issue issue6
Publisher Okayama University Medical School
Start Page 359
End Page 365
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 20035292
Web of Sience KeyUT 000273145900007
JaLCDOI 10.18926/AMO/30715
FullText URL fulltext.pdf
Author Kim, Eugene| Jeong, Hwa Jae| Lee, Ki Won| Song, Jung Suk|
Abstract The purpose of this study was to investigate the validity of the supraspinatus test as a screening test for detecting torn rotator cuff and to determine what its valuable positive signs were. Both the empty-can test and full-can test were performed on 200 shoulders diagnosed by magnetic resonance imaging (MRI)-and in some cases, surgical findings-to have full-thickness or partial-thickness torn rotator cuff s, or no tear in the rotator cuff . During the maneuver, the presence of pain or weakness or both pain and weakness were recorded as positive signs, and the distribution of these signs were analyzed according to the degree of tear. The predictive values were calculated in 2 ways by considering (1) only full-thickness tears as tears and (2) both full- and partial-thickness tears as tears. The 2 tests and the 2 ways of considering partial-thickness tears were compared. Pain and weakness were severity-dependent, and the empty-can test had a higher incidence of pain. The sensitivities of the 2 supraspinatus tests in all positive signs were higher when including partial-thickness tears in the tear group ; however, their specificities were higher when excluding partial-thickness tears. Both pain and weakness were interpretive for the supraspinatus test, and both tests were sensitive to full- and partial- thickness tears and specific for full-thickness tears.
Keywords rotator cuff tear screening test
Amo Type Article
Published Date 2006-08
Publication Title Acta Medica Okayama
Volume volume60
Issue issue4
Publisher Okayama University Medical School
Start Page 223
End Page 228
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 16943859
Web of Sience KeyUT 000239911100003