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등속성 검사를 통한 견관절 전방 불안정 환자와 정상인의 회전력 비교

Comparison of Rotational Strength in Shoulders with Anterior Instability and Normal Shoulders Using Isokinetic Testing

  • 이동기 (고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터) ;
  • 김태권 (고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터) ;
  • 이진혁 (고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터) ;
  • 이대희 (고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터) ;
  • 정웅교 (고려대학교 의과대학 정형외과학교실, 고려대학교 안암병원 스포츠의학센터)
  • Lee, Dong-Ki (Department of Orthopedic Surgery, Sports Medicine Center, University College of Medicine, Anam Hospital) ;
  • Kim, Tae-Kwon (Department of Orthopedic Surgery, Sports Medicine Center, University College of Medicine, Anam Hospital) ;
  • Lee, Jin-Hyuck (Department of Orthopedic Surgery, Sports Medicine Center, University College of Medicine, Anam Hospital) ;
  • Lee, Dae-Hee (Department of Orthopedic Surgery, Sports Medicine Center, University College of Medicine, Anam Hospital) ;
  • Jung, Woong-Kyo (Department of Orthopedic Surgery, Sports Medicine Center, University College of Medicine, Anam Hospital)
  • 투고 : 2012.04.18
  • 심사 : 2012.11.14
  • 발행 : 2012.12.31

초록

목적: 견관절 전방불안정 환자는 탈구에 대한 불안감 및 탈구시의 통증 등 다양한 원인으로 정상적인 운동 및 활동을 하지 못할 것으로 예상할 수 있으나 이에 대한 연구는 미미한 실정이다. 본 연구에서는 견관절 전방불안정 환자와 정상인 사이의 내회전 및 외회전력에 대해 등속성 근력 검사를 시행하여 전방불안정 환자에서 나타나는 회전력의 변화를 살펴보고자 하였다. 대상 및 방법: 2009년 3월부터 2010년 2월까지 우측 우세수의 견관절 전방 불안정 진단 하에 수술적 치료를 시행한 환자 중 수술 전 등속성 근력 검사를 시행한 환자 13명을 대상으로 하였고, 견관절의 전방불안정 증상이 없는 정상 성인 15명을 대조군으로 설정하였다. 대상군 및 대조군 모두 남성이었으며 두 군간의 평균 연령, 신장, 체중, 체질량 등의 차이는 없었다. 등속성 근력 검사는 Biodex system (Biodex Medical Systems, Shirley, NY, USA)을 사용하여 60 deg/sec, 180 deg/sec 의 각속도로 견관절의 외회전력 및 내회전력의 체중보정 최대우력 (peak torque)과 총 일량을 측정하였고, 외회전, 내회전 최대우력비율 및 운동피로도를 계산하였다. 두 군간에 각 측정치를 비교하여 전방 불안정 환자의 회전력의 특징을 분석하였다. 결과: 불안정증이 없는 좌측 견관절의 등속성 회전근력은 양군 사이에 모든 측정치에서 차이가 없었다. 우측 견관절의 등속성 근력 검사결과 내회전력은 전방 불안정환자와 정상 대조군 간 모든 각속도에서 최대우력 및 총 일량 사이에 유의한 차이가 없었다. 외회전력의 체중보정 최대우력과 총 일량은 전방불안정 환자에서 60 deg/sec 및 180 deg/sec 두 각속도에서 모두 정상 대조군에 비하여 감소되었고, 외회전력/내회전력의 최대우력비율 역시 통계적 차이가 있었다. 운동피로도는 외회전력, 내회전력 모두 양 군간에 의미 있는 차이는 없었다. 결론: 견관절 전방불안정 환자는 견관절의 외회전력이 감소되어 있고 내회전-외회전력의 균형이 소실되어 있으나 근피로도는 정상으로 판단되며 이는 견관절 탈구 환자의 보존적 치료나 재활에 있어 고려해야 할 것으로 생각된다.

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.

키워드

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