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2001 Fiscal Year Final Research Report Summary

Mechanism of Inferior Capsular Shift Procedure for Multidirectional Instability of the Shoulder

Research Project

Project/Area Number 12671392
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Orthopaedic surgery
Research InstitutionAkita University

Principal Investigator

ITOI Eiji  Akita University, School of Medicine, Professor, 医学部, 教授 (80193465)

Project Period (FY) 2000 – 2001
Keywordsshoulder instability / multidirectional instability / inferior capsular shift / loose shoulder / Intraarticular pressure
Research Abstract

We performed this experimental study to investigate the mechanism of inferior capsular shift procedure to stabilize the shoulder with multidirectional instability.
We used 10 fresh previously-frozen cadaveric shoulders. All the muscles were removed from the shoulder, and the scapula was stabilized to the custom-made shoulder fixator. The position of the humeral head relative to the glenoid was measured using plain roentgenograms. The humerus was loaded inferiorly with 0 kg, 0,5 kg, and 1.0 kg load. The capsular conditions were 1) intact, 2) anteroinferior capsule imbricated using a clamp, 3) posteroinferior capsule imbricated in the same fashion. The Intraarticular pressure was measured using a pressure sensor attached to the catheter filled with saline.
The negative value of intraarticular pressure increased with the increase of the load in a linear fashion. This was also observed after imbrication of anterior and posterior capsule. There was no significant difference between the capsular conditions. The position of the humeral head translated less than 5 mm when the Intraarticular pressure was intact regardless of capsular conditions. When the Intraarticular pressure was vented, the humeral head dislocated inferiorly. After the imbrication of anterior and posterior capsule, the humeral head was still inferiorly subluxated.
In conclusion, the major stabilizing mechanism of the inferior capsular shift procedure is to maintain the intraarticular pressure by reducing the joint volume.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 井樋 栄二: "動揺肩の病態"日本整形外科学会雑誌. 74. S259 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井樋 栄二: "動揺肩のバイオメカニクス"Monthly Book Orthopaedics. 19(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoi E: "The effect of glenoid defect on anteroinferior stability of the sbonlder after Bankaut repair"J Bone Joint Snug. 82-A. 35-46 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Halder Am: "Anatomy and biomechanics of the shorlder"Orehop Clin North Am. 31. 159-176 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoi E: "Position of immobilization after disloation of the gleno-hmmeral joint : a stndy with use of MRI"J Bone Joint surg. 83-A. 661-667 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoi E: "Range of motion after Bomkart repair : vertical compared with herizontel capsnlotomy"Am J Sports Med. 29. 441-445 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井樋 栄二: "NEW MOOK整形外科10肩の外科,肩の動作解析バイオメカニクス"金原出版. 353 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoi E, et al.: "Pathophysiology of Multidirectional instability of the shoulder"Jpn Orthop Assoc(In Japanese). 74. S259 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itoi E: "Biomechanics of multidirectional instability"Monthly Book Orthopaedics. 19(In Press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itoi E, et al.: "The effect of a glenoid defect on anteroinferior stability of the shoulder after Bankart repair: a cadaveric study"J Bone Joint Surg [Am]. 82-A. 35-46 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Halder AM, et al.: "Anatomy and biomechanics of the shoulder"Orthop Clin North Am. 31. 159-176 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itoi E, et al.: "Position of immobilization after dislocation of the glenohumeral joint: a study with use of magnetic resonance imaging"J Bone Joint Surg [Am]. 83-A. 661-667 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itoi E, et al.: "Range of motion after Bankart repair: vertical compared with horizontal capsulotomy"Am J Sports Med. 29. 441-445 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itoi E: "Motion analysis and biornechanics of the shoulder"New Mook of Orthopaedics Vol. 10: Shouldeer Diseases, 1st Ed. Edited by Ochi T, Kikuchi S. Kanehara, Tokyo(In Japanese). 1-353 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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