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Clin Shoulder Elbow > Volume 15(2); 2012 > Article
Clinics in Shoulder and Elbow 2012;15(2):79-85.
DOI: https://doi.org/10.5397/CiSE.2012.15.2.79    Published online December 31, 2012.
Comparison of Rotational Strength in Shoulders with Anterior Instability and Normal Shoulders Using Isokinetic Testing
Dong Ki Lee, Tae Kwon Kim, Jin Hyuck Lee, Dae Hee Lee, Woong Kyo Jung
Department of Orthopedic Surgery, Sports Medicine Center, Korea University College of Medicine, Anam Hospital, Seoul, Korea. drshoulder@korea.ac.kr
등속성 검사를 통한 견관절 전방 불안정 환자와 정상인의 회전력 비교
이동기·김태권·이진혁·이대희·정웅교
고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터
Abstract
OBJECTIVE
It has been expected that patient with posttraumatic recurrent anterior shoulder dislocation might have limited daily life activity because of pain and apprehension of dislocation. But there have been only a small number of investigations regarding the rotator strength in this patient. The aim of this study is to find the characteristics about rotator strength of patient with posttraumatic recurrent anterior shoulder dislocation using an isokinetic testing. METHOD: We enrolled thirteen patients with posttraumatic recurrent anterior shoulder dislocation and fifteen sex, age-matched healthy nonathletic subjects in this controlled study. All participants were male and there were no significant differences between the two groups in age, height, weight, BMI. Isokinetic internal rotator and external rotator strength was evaluated with a Biodex Isokinetic Testing machine (Biodex Medical Systems, Shirley, NY, USA), tests were performed at 60 deg/sec and 180 deg/sec for both sides. Peak torque normalized to body weight, external rotator to internal rotator ratio, total work and fatigue were calculated for each angular velocity. The association between internal rotator and external rotator strength and shoulder instability was analyzed by comparisons with a control group.
RESULTS
Any notable differences could not be found between the two groups given all data from no symptomatic left shoulder. There were no significant differences between the two groups statistically in internal rotation strength of right shoulder. However, there has been a tendency that at all angular velocities, external rotator peak torque to body weight, total work and external rotator to internal rotator ratio were significantly lower in the anterior instability group than the control group at all angular velocities. There was no substantial difference between those groups with respect to the fatigue of external rotator and internal rotator in our study.
CONCLUSION
The prominent characteristics of posttraumatic recurrent anterior shoulder dislocation are external rotator weakness and loss of balance with external rotator and internal rotator. Therefore selective training using this information rotator might be helpful in conservative treatment and rehabilitation.
Key Words: Shoulder; Anterior instability; Isokinetic muscle strengthening test
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