Styloid_process_(radius)

Radial styloid process

Radial styloid process

Bone projection on the radius

The radial styloid process is a projection of bone on the lateral surface of the distal radius bone.

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Structure

The radial styloid process is found on the lateral surface of the distal radius bone.[1] It extends obliquely downward into a strong, conical projection. The tendon of the brachioradialis attaches at its base.[2] The radial collateral ligament of the wrist attaches at its apex. The lateral surface is marked by a flat groove for the tendons of the abductor pollicis longus and extensor pollicis brevis.

Clinical significance

Breakage of the radius at the radial styloid is known as a Chauffeur's fracture; it is typically caused by compression of the scaphoid bone of the hand against the styloid.

De Quervain syndrome causes pain over the styloid process of the radius.[3][4] This is due to the passage of the inflamed extensor pollicis brevis tendon and abductor pollicis longus tendon around it.[4][5]

The styloid process of the radius is a useful landmark during arthroscopic resection of the scaphoid bone.[6]

A prominent styloid process of the radius makes applying a wrist splint more difficult.[7]

References

Public domain This article incorporates text in the public domain from page 220 of the 20th edition of Gray's Anatomy (1918)

  1. [1]
    Mansfield, Paul Jackson; Neumann, Donald A. (2019-01-01), Mansfield, Paul Jackson; Neumann, Donald A. (eds.), "Chapter 6 - Structure and Function of the Wrist", Essentials of Kinesiology for the Physical Therapist Assistant (Third Edition), St. Louis (MO): Mosby, pp. 120–140, ISBN 978-0-323-54498-6, retrieved 2021-01-07
  2. [2]
    Freehafer, Alvin A.; Hunter Peckham, P.; Keith, Michael W.; Mendelson, Laurel S. (1988-01-01). "The brachioradialis: Anatomy, properties, and value for tendon transfer in the tetraplegic". The Journal of Hand Surgery. 13 (1): 99–104. doi:10.1016/0363-5023(88)90210-9. ISSN 0363-5023. PMID 3351238.
  3. [3]
    Cooper, Cynthia (2014-01-01), Cooper, Cynthia (ed.), "28 - Elbow, Wrist, and Hand Tendinopathies", Fundamentals of Hand Therapy (Second Edition), St. Louis: Mosby, pp. 383–393, doi:10.1016/b978-0-323-09104-6.00028-6, ISBN 978-0-323-09104-6, retrieved 2020-12-12
  4. [4]
    Howard, Thomas M; Rassner, Leslie H (2008-01-01), Seidenberg, Peter H.; Beutler, Anthony I. (eds.), "Chapter 48 - Therapeutic and Diagnostic Injections and Aspirations", The Sports Medicine Resource Manual, Philadelphia: W.B. Saunders, pp. 574–597, doi:10.1016/b978-141603197-0.10047-3, ISBN 978-1-4160-3197-0, retrieved 2020-12-12
  5. [5]
    Waldman, Steven D. (2019-01-01), Waldman, Steven D. (ed.), "52 - de Quervain's Tenosynovitis", Atlas of Common Pain Syndromes (Fourth Edition), Philadelphia: Elsevier, pp. 204–207, doi:10.1016/b978-0-323-54731-4.00052-9, ISBN 978-0-323-54731-4, retrieved 2020-12-12
  6. [6]
    Tomaino, Matthew M.; Leit, Michael (2010-01-01), Slutsky, David J. (ed.), "CHAPTER 37 - Arthroscopic/Open Distal Scaphoid Resection", Principles and Practice of Wrist Surgery, Philadelphia: W.B. Saunders, pp. 397–402, ISBN 978-1-4160-5646-1, retrieved 2020-12-12
  7. [7]
    Fess, Elaine Ewing; Gettle, Karan S.; Philips, Cynthia A.; Janson, J. Robin, eds. (2005-01-01), "CHAPTER 8 - Design Principles", Hand and Upper Extremity Splinting (Third Edition), Saint Louis: Mosby, pp. 210–236, doi:10.1016/b978-080167522-5.50013-7, ISBN 978-0-8016-7522-5, retrieved 2020-12-12
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