To diagnose patellar clunk syndrome, I rely on my clinical skills and observations. It is essential to listen to the patient’s description of their symptoms and perform a thorough physical examination.
During the examination, I pay close attention to the knee joint. I look for any signs of swelling, redness, or deformity. I also assess the range of motion of the knee, checking for any limitations or pain.
One key feature that helps in diagnosing patellar clunk syndrome is the presence of a painful, palpable “pop” or “catch” as the knee extends. This typically occurs at around 40 degrees of flexion. The patient may describe it as a feeling of something getting stuck or catching in the knee joint.
I gently manipulate the patella, feeling for any abnormal movement or clicking sensation. This can help confirm the diagnosis of patellar clunk syndrome.
Imaging studies such as X-rays or magnetic resonance imaging (MRI) may be ordered to rule out other possible causes of knee pain and to assess the overall condition of the knee joint. However, these imaging studies may not always be necessary for the diagnosis of patellar clunk syndrome.
In some cases, a diagnostic arthroscopy may be performed. This involves inserting a small camera into the knee joint to directly visualize the patella and surrounding structures. It allows for a more accurate diagnosis and can also be used to treat the condition by removing any scar tissue or adhesions that may be causing the “clunk.”
Making a diagnosis of patellar clunk syndrome requires a combination of careful history-taking, thorough physical examination, and, in some cases, imaging or arthroscopy. It is important to consider this condition in patients who present with a painful “pop” or “catch” during knee extension, particularly at around 40 degrees of flexion.