scholarly journals Reefing of the Posteromedial Capsule in Anteromedial Rotatory Instability

2018 ◽  
Vol 7 (5) ◽  
pp. e547-e551 ◽  
Author(s):  
Christoph Offerhaus ◽  
Maurice Balke ◽  
Justin W. Arner ◽  
Volker Musahl ◽  
Jürgen Höher
Keyword(s):  
Rotatory Instability ◽  
Anteromedial Rotatory Instability ◽  
Posteromedial Capsule

scholarly journals The medial ligaments and the ACL restrain anteromedial laxity of the knee

2020 ◽  
Vol 28 (12) ◽  
pp. 3700-3708 ◽  
Author(s):  
S. Ball ◽  
J. M. Stephen ◽  
H. El-Daou ◽  
A. Williams ◽  
Andrew A. Amis
Keyword(s):  
Graft Failure ◽  
External Rotation ◽  
Collateral Ligament ◽  
Rotatory Instability ◽  
Posterior Translation ◽  
Anteromedial Rotatory Instability ◽  
Posteromedial Capsule ◽  
Intact Knee ◽  
Anterior Posterior

Abstract Purpose The purpose of this study was to determine the contribution of each of the ACL and medial ligament structures in resisting anteromedial rotatory instability (AMRI) loads applied in vitro. Methods Twelve knees were tested using a robotic system. It imposed loads simulating clinical laxity tests at 0° to 90° flexion: ±90 N anterior–posterior force, ±8 Nm varus–valgus moment, and ±5 Nm internal–external rotation, and the tibial displacements were measured in the intact knee. The ACL and individual medial structures—retinaculum, superficial and deep medial collateral ligament (sMCL and dMCL), and posteromedial capsule with oblique ligament (POL + PMC)—were sectioned sequentially. The tibial displacements were reapplied after each cut and the reduced loads required allowed the contribution of each structure to be calculated. Results For anterior translation, the ACL was the primary restraint, resisting 63–77% of the drawer force across 0° to 90°, the sMCL contributing 4–7%. For posterior translation, the POL + PMC contributed 10% of the restraint in extension; other structures were not significant. For valgus load, the sMCL was the primary restraint (40–54%) across 0° to 90°, the dMCL 12%, and POL + PMC 16% in extension. For external rotation, the dMCL resisted 23–13% across 0° to 90°, the sMCL 13–22%, and the ACL 6–9%. Conclusion The dMCL is the largest medial restraint to tibial external rotation in extension. Therefore, following a combined ACL + MCL injury, AMRI may persist if there is inadequate healing of both the sMCL and dMCL, and MCL deficiency increases the risk of ACL graft failure.

Factors for the presence of anteromedial rotatory instability of the knee

2004 ◽  
Vol 9 (4) ◽  
pp. 380-385 ◽  
Author(s):  
Makoto Kurimura ◽  
Hideo Matsumoto ◽  
Kyosuke Fujikawa ◽  
Yoshiaki Toyama
Keyword(s):  
Rotatory Instability ◽  
Anteromedial Rotatory Instability

Surgical reconstruction of chronic anteromedial rotatory instability of the knee

1979 ◽  
Vol 7 (3) ◽  
pp. 165-168 ◽  
Author(s):  
Stephen C. Hunter ◽  
James R. Andrews ◽  
William D. McLeod ◽  
George M. McCluskey ◽  
Turner A. Blackburn
Keyword(s):  
Surgical Reconstruction ◽  
Rotatory Instability ◽  
Anteromedial Rotatory Instability
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