Anatomy of the Adductor Magnus Origin: Implications for Proximal Hamstring Injuries

Mitchel R. Obey, Stephen Broski, Robert J. Spinner, Mark S. Collins, Aaron Krych

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Background: The adductor magnus (AM) has historically been a potential source of confusion in patients with suspected proximal hamstring avulsion injuries. Purpose: To investigate the anatomic characteristics of the AM, including its osseous origin, anatomic dimensions, and relationship to the proximal hamstring tendons. Study Design: Descriptive laboratory study. Methods: Dissection of the AM origin was performed in 11 (8 cadavers) fresh-frozen hip-to-foot cadaveric hemipelvis specimens. The gross anatomy and architecture of the proximal hamstring and AM tendons were studied. After dissecting the hamstring tendons away from their origin, the dimension, shape, and orientation of the tendon footprints on the ischial tuberosity were determined. Results: The AM was identified in all cadaveric specimens. The mean tendon thickness (anterior to posterior [AP]) was 5.7 ± 2.9 mm. The mean tendon width (medial to lateral [ML]) was 7.1 ± 2.2 mm. The mean tendon length was 13.1 ± 8.7 cm. The mean footprint height (AP dimension) was 12.1 ± 2.9 mm, and mean footprint width (ML dimension) was 17.3 ± 7.1 mm. The mean distance between the AM footprint and the most medial aspect of the conjoint tendon footprint was 8.5 ± 4.2 mm. Tendon measurements demonstrated a considerable degree of both intra- and interspecimen variability. Conclusion: The AM tendon is consistently present just medial to the conjoint tendon at the ischial tuberosity, representing the lateral-most portion of the AM muscle. This study found wide variation in the dimensional characteristics of the AM tendon between specimens. Its shape and location can mimic the appearance of an intact hamstring (conjoint or semimembranosus) tendon intraoperatively or on diagnostic imaging, potentially misleading surgeons and radiologists. Therefore, detailed knowledge of the AM tendon anatomy, footprint anatomy, and its relationship to the hamstring muscle complex is paramount when planning surgical approach and technique. Clinical Relevance: The reported data may aid surgeons in more accurate recognition, diagnosis, and repair of proximal hamstring avulsion injuries.

Original languageEnglish (US)
JournalOrthopaedic Journal of Sports Medicine
Volume4
Issue number1
DOIs
StatePublished - Jan 11 2016

Fingerprint

Tendons
Anatomy
Wounds and Injuries
Diagnostic Imaging
Cadaver
Dissection
Hip
Foot
Muscles

Keywords

  • adductor magnus
  • anatomy
  • hamstring avulsion
  • hamstring repair
  • hamstring tendons
  • proximal hamstring

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Anatomy of the Adductor Magnus Origin : Implications for Proximal Hamstring Injuries. / Obey, Mitchel R.; Broski, Stephen; Spinner, Robert J.; Collins, Mark S.; Krych, Aaron.

In: Orthopaedic Journal of Sports Medicine, Vol. 4, No. 1, 11.01.2016.

Research output: Contribution to journalArticle

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