Patellar clunk is a known complication of which surgery?
**Patellar Clunk Syndrome**
### Core Concept
Patellar clunk syndrome is a rare complication that occurs after knee surgery, characterized by the abnormal tracking of the patella (kneecap) under the femoral condyles. This condition is often associated with the use of a metal or plastic patellar component in total knee arthroplasty (TKA) or patellofemoral arthroplasty.
### Why the Correct Answer is Right
The patellar clunk syndrome is thought to be caused by the impingement of the metal or plastic patellar component against the femoral condyles, leading to pain, stiffness, and limited mobility of the knee. This condition can occur due to the malpositioning or malrotation of the patellar component, which can cause the patella to track abnormally, leading to the characteristic clunking sensation. The patellar clunk syndrome is often associated with the use of a metal-backed patellar component, which can cause the patella to become loose and displace over time.
### Why Each Wrong Option is Incorrect
**Option A:** This option is incorrect because patellar clunk syndrome is not typically associated with arthroscopic knee surgery. While arthroscopy can cause patellar tracking problems, it is not a common cause of patellar clunk syndrome.
**Option B:** This option is incorrect because patellar clunk syndrome is not typically associated with osteoarthritis. While osteoarthritis can cause patellar tracking problems, it is not a common cause of patellar clunk syndrome.
**Option C:** This option is incorrect because patellar clunk syndrome is not typically associated with patellar fractures. While patellar fractures can cause patellar tracking problems, they are not a common cause of patellar clunk syndrome.
### Clinical Pearl / High-Yield Fact
To avoid patellar clunk syndrome, it is essential to ensure proper patellar component positioning and rotation during TKA or patellofemoral arthroplasty. This can be achieved by using a patellar component with a smooth, rounded surface and by ensuring that the component is properly aligned with the femoral condyles.
### Correct Answer: C.