Knee & Shoulder Surgeon - Orthopedic Specialist
Knee & Shoulder Surgeon - Dr. Amyn Rajani
M.S Orth (Gold Medallist), D-Orth, MBBS
Knee and Shoulder Surgeon
(Arthroscopy & Joint Reconstruction)
Orthopaedic Arthroscopy Knee & Shoulder Clinic (OAKS)

Patella Clunk Syndrome

Introduction
This is a syndrome which occurs when a fibrous nodule forms on the joint capsule, just above the patella. This is a complication of total knee replacement and once this develops the knee starts making a loud clunk. At about 40 degrees of flexion this lump gets trapped between the anterior flange of the femoral component and hence the clunk.

Causes :
According to the theories there are two causes
  • Design of the implant
  • More than average flexion of the knee

  • Clinical Findings :
    Discomfort and pain in the knee, loud clunk on flexion, blocking of further movement, synovitis, effusion.

    Prevention :
    With the use of the newer designs of the total knee prosthesis very few cases of patella clunk have been seen. This is because the newer designs offer a much longer and deeper groove for the patella to fall back into the notch of the femur.

    Treatment :
    Removal of the lump by arthroscopy of the knee joint.

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