- if patient is able to flex beyond 120 deg and if scar forms on quad tendon, this scar may be carried into notch of femoral component;
- when the patient extends the knee (especially against resistance such as rising from a chair) the fibrotic nodule catches on the anterior
edge of the femoral component;
- scar eventually releases w/ a painful clunk, allowing leg to extend;
- risk factors:
- common in posterior stabilized TKR;
- patella infera is a risk factor;
- Clinical Presentation:
- pt may report loosening, dislocation, or giving out because the patella catches during extension and tracks roughly;
- arthroscopic resection of the offending scar tissue
Arthroscopic managment of the patellar clunk syndrome following posterior stabilized total knee arthroplasty.
The patellar clunk syndrome: A complication of posterior stabilized total knee arthroplasty.
Synovial Entrapment: A Complication of Posterior Stabilized Total Knee Arthroplasty.
The patellar "clunk" syndrome after posterior stabilized total knee arthroplasty.
Intra-articular fibrous bands. Patellar complications after total knee replacement.