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Screw home mechanism (loking and unlocking of knee)

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2025/2026 Written for academic year
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The screw home mechanism is the automatic rotation of the knee joint during the last 20–30° of extension, which locks the knee and makes it stable for standing. It is called “screw home” because the movement is similar to tightening a screw — a small rotation that locks the joint.

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Timesphysio Institute – The Nerve of Learning

Locking and Unlocking of Knee Joint
 Also called screw home mechanism
 Locking – when knee is in full extension that is standing
 Unlocking – Initial flexion from locked knee

 Definition – The rotations that occurs between the femoral
condyles and tibia during final degrees of extension is called
Screw home mechanism.


Anatomical basis of locking and unlocking
 Articular surface of tibia and femur are not congruent
 Medial condyles has large antero-posterior diameter than lateral
condyles


Mechanism of Locking (when femur is fixed)
(1) During last 30 – 0 degree of extension locking is evident in last
5 degree of extension


(2) The A-P diameter of lateral condyles is less than that of medial
condyle




Notes by – Dr. Mitali Yadav Page 1
Connected book
image
Pamela K Levangie, Cynthia C Norkin Joint Structure and Function
Publisher: 2011 ISBN: 9780803626348 Edition: Unknown

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March 25, 2026
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2025/2026
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Class notes
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Dr.deepika panday
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Subjects

  • screw home mechanism
  • locking of knee
  • unlocking of knee
  • biomechanics
  • knee joint
  • knee complex

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