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Varus Stress Test Wheeless

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Description: Torn Collateral Tested in Flexion:
- when tested in flexion which relaxes posterior capsule, same ligamentous laxity will result in a much greater degree of instability;
- at 30 deg flexion, the cruciates are in their most relaxed state, and pathologic laxity palpated is capsular laxity;
- varus instability in flexion:
- role of LCL increases w/ joint flexion, as posterolateral structures become lax;
- w/ joint flexion, resistance by ACL decreases, but large forces are found in PCL at 90 degrees of flexion;
- LCL is primary restraint to varus stress at 5 deg & 25 deg flexion;
- lateral capsular structure provide secondary support;
- iliotibial band & popliteus muscles have dynamic stabilizing role;
- Torn Collateral Tested in Extension:
- intact cruciate ligaments and posterior capsule are taut & little abduction or adduction instability is detectable;
- instability w/ varus or valgus stress testing suggests cruciate ligament disruption in addition to collateral ligament disruption;
Wheeless' Textbook of Orthopaedics

Type: Reference Material
Author/Contact: C.R.Wheeless
Institution: Duke
Primary Subject/Category:

Language: English

Submitted by: admin
Hits: 349
Added: Mon Feb 04 2002
Last Modified: Sun Apr 13 2008