Post-cam clunk syndrome after posterior stabilized total knee arthroplasty as a sign of early femoral component loosening

• Main Authors: Akihiko Toda, Katsumasa Tei, Tomoyuki Matsumoto, Kazunari Ishida, Hiroshi Sasaki, Kazuki Kodato, Yuichiro Nishizawa, Shinsuke Kirizuki, Nao Shibanuma, Hiroomi Tateishi, Ryosuke Kuroda, Masahiro Kurosaka
• Format: Article
• Language: English
• Published: Elsevier 2018-01-01
• Series: Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology
• Subjects: High-flexion PS-TKA; Impingement; Arthroscopy; Post-cam clunk syndrome
• Online Access: http://www.sciencedirect.com/science/article/pii/S2214687317303321

Soft tissue impingements are well-known complications of total knee arthroplasty. The impingements usually occur between the medial or lateral femoral component and tibial insert, and between the patella and femoral components. We report a rare case of impingement of the soft tissue between the femoral intercondylar fossa and post of the polyethylene insert, which caused pain and walking disability. After the surgery for the arthroscopic removal of the soft tissue, the symptoms disappeared. However, prosthetic loosening of the femur occurred several months after the arthroscopic surgery, requiring revision surgery. We would propose to call this symptom as post-cam clunk syndrome.