Sonographic appearance of fibrous nodules in patellar clunk syndrome: a case report

Magnetic Resonance Imaging Evaluation of the Painful Total Knee Arthroplasty

“…41 Ultrasound may also be bene-ficial by confirming the movement of the nodule during knee flexion and extension in real time while also providing size dimensions of the nodule. 44…”

Patello-femoral clunk syndrome-current concepts

“…15 The ideal treatment is removal of the suprapatellar tissue and a patellar component revision. 16 The fibrotic reactions after total knee arthroplasty: (A)Multiples or complex bundles reactions; and (B) Singles or isolates nodular forms: fibrous nodule in the femoropatelar area (clunk syndrome), and fibrous nodule in the intercondylar notch. 17 Open resection through a limited lateral incision for the treatment of patellar clunk syndrome associated with patellar tilt in total knee arthroplasty is described.…”

Sonography of Joint Replacements

“…Sonography demonstrates an echogenic mass with internal vascularity deep to the normal echogenic fibrillary appearance of the quadriceps tendon. 26 Stiffness after TKA, called arthrofibrosis, can be a debilitating complication in which the patient cannot fully flex or extend the knee. There is no agreed upon clinical definition of the degree of decreased motion, but patients are limited to between about 15 and 75 degrees of flexion or have an arc of motion less than 70 degrees.…”