Ulnar styloid abduction angle: a novel radiological predictor of Palmer Type IB tears of the triangular fibrocartilage complex - Takeaways - MDSpire

Ulnar styloid abduction angle: a novel radiological predictor of Palmer Type IB tears of the triangular fibrocartilage complex

  • By

  • Wanxue Wang

  • Yixin Zhang

  • Junmiao Liu

  • Heming Xu

  • Xiaoyang Xu

  • Peng Chen

  • Haipeng Liu

  • Haitao Fu

  • Xia Zhao

  • Chao Qi

  • July 3, 2026

  • 0 min

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  • 1

    The study investigates the ulnar styloid abduction angle (USAA) as a predictor for Palmer Type IB TFCC tears.

  • 2

    Increased USAA is significantly associated with Palmer Type IB tears, independent of ulnar variance.

  • 3

    The optimal USAA cut-off value of ≥17.5° shows 81.8% sensitivity and 78.2% specificity for identifying tears.

  • 4

    A non-linear dose–response relationship exists between USAA and the risk of TFCC injury.

  • 5

    USAA can be reliably measured on standard wrist radiographs, aiding in early risk stratification for wrist ulnar pain.

Original Source(s)

Ulnar styloid abduction angle: a novel radiological predictor of Palmer Type IB tears of the triangular fibrocartilage complex

  • by Wanxue Wang, Yixin Zhang, Junmiao Liu, Heming Xu, Xiaoyang Xu, Peng Chen, Haipeng Liu, Haitao Fu, Xia Zhao, Chao Qi

  • July 3, 2026

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