National Physical Therapy Examination (NPTE) Practice Exam

Which of the following is NOT part of the wrist's triangular fibrocartilage complex (TFCC)?

1. Radial collateral ligament

2. Posterior radioulnar ligament

3. Ulnar collateral ligament

4. Ulnar articular cartilage

The correct answer is: Radial collateral ligament

The triangular fibrocartilage complex (TFCC) is a structure located on the ulnar side of the wrist that plays a critical role in stability and the function of the wrist joint. It consists of several important components that contribute to its overall functionality. The radial collateral ligament is not part of the TFCC. Instead, it is associated with the radial side of the wrist and is involved in stabilizing the wrist in radial deviation movements. In contrast, the TFCC includes structures such as the posterior radioulnar ligament and the ulnar articular cartilage, which contribute to stability and help in load transmission across the wrist joint. The posterior radioulnar ligament is known to be part of the TFCC, providing connections between the distal radius and ulnar during forearm pronation and supination. Additionally, the ulnar articular cartilage contributes to the cushioning effect and articulation between the ulnar head and the carpal bones. By understanding these components, one can appreciate the overall structure of the TFCC and its importance in wrist biomechanics, confirming that the radial collateral ligament does not belong to this specific complex.