The adductor magnus “mini-hamstring”: MRI appearance and potential pitfalls

Stephen Broski, Naveen S Murthy, Aaron Krych, Mitchel R. Obey, Mark S. Collins

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Objective: To examine the anatomic MRI characteristics of the adductor magnus mini hamstring (AMMH) and explore its involvement in cases of hamstring avulsion. Materials and methods: An IRB-approved retrospective review of patients undergoing “hamstring protocol” MRI between March 2009 and June 2014 was performed. Two musculoskeletal radiologists recorded multiple AMMH anatomic characteristics and involvement in cases of hamstring avulsion. Results: Seventy-six AMMHs were analyzed in 66 patients [35 females and 31 males, mean age 49.3 ± 15.2 years (range 17–81)]. Eleven percent of AMMHs were poorly visualized, 51 % visualized, and 37 % well visualized. Seven percent demonstrated round, 73 % ovoid, and 21 % flat/lenticular tendon morphologies. Most (88 %) demonstrated typical origins. Average cross-sectional area (CSA) was 22.4 ± 10.6 mm² (range 6–56), diameter was 7.2 ± 2.5 mm (range 2.9–15), medial distance from the semimembranosus tendon was 7.5 ± 2.5 mm (range 3–14), and tendon length was 6.8 ± 3.3 cm (range 1.2–14.1). There was no gender difference in AMMH anatomic measurements or correlation between age and CSA or diameter. Of 17 complete hamstring avulsion cases, the AMMH was intact in 13, partially torn in 3, and completely torn in 1. Conclusion: The AMMH is a constant finding with variable anatomic characteristics. It is visualized or well visualized by MRI in 88 % of cases and is a sizable tendon located in close proximity to the semimembranosus tendon. Because it is uncommonly completely torn (6 %) in cases of complete hamstring avulsion, radiologists should be aware of its presence and appearance to avoid diagnostic confusion.

Original languageEnglish (US)
Pages (from-to)213-219
Number of pages7
JournalSkeletal Radiology
Volume45
Issue number2
DOIs
StatePublished - Feb 1 2016

Fingerprint

Tendons
Research Ethics Committees
Radiologists
Hamstring Tendons

Keywords

  • Adductor magnus
  • Hamstring
  • Ischial tuberosity
  • Ischiocondylar

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

The adductor magnus “mini-hamstring” : MRI appearance and potential pitfalls. / Broski, Stephen; Murthy, Naveen S; Krych, Aaron; Obey, Mitchel R.; Collins, Mark S.

In: Skeletal Radiology, Vol. 45, No. 2, 01.02.2016, p. 213-219.

Research output: Contribution to journalArticle

@article{0fe6ad9222564516ae14c764956d2296,
title = "The adductor magnus “mini-hamstring”: MRI appearance and potential pitfalls",
abstract = "Objective: To examine the anatomic MRI characteristics of the adductor magnus mini hamstring (AMMH) and explore its involvement in cases of hamstring avulsion. Materials and methods: An IRB-approved retrospective review of patients undergoing “hamstring protocol” MRI between March 2009 and June 2014 was performed. Two musculoskeletal radiologists recorded multiple AMMH anatomic characteristics and involvement in cases of hamstring avulsion. Results: Seventy-six AMMHs were analyzed in 66 patients [35 females and 31 males, mean age 49.3 ± 15.2 years (range 17–81)]. Eleven percent of AMMHs were poorly visualized, 51 {\%} visualized, and 37 {\%} well visualized. Seven percent demonstrated round, 73 {\%} ovoid, and 21 {\%} flat/lenticular tendon morphologies. Most (88 {\%}) demonstrated typical origins. Average cross-sectional area (CSA) was 22.4 ± 10.6 mm² (range 6–56), diameter was 7.2 ± 2.5 mm (range 2.9–15), medial distance from the semimembranosus tendon was 7.5 ± 2.5 mm (range 3–14), and tendon length was 6.8 ± 3.3 cm (range 1.2–14.1). There was no gender difference in AMMH anatomic measurements or correlation between age and CSA or diameter. Of 17 complete hamstring avulsion cases, the AMMH was intact in 13, partially torn in 3, and completely torn in 1. Conclusion: The AMMH is a constant finding with variable anatomic characteristics. It is visualized or well visualized by MRI in 88 {\%} of cases and is a sizable tendon located in close proximity to the semimembranosus tendon. Because it is uncommonly completely torn (6 {\%}) in cases of complete hamstring avulsion, radiologists should be aware of its presence and appearance to avoid diagnostic confusion.",
keywords = "Adductor magnus, Hamstring, Ischial tuberosity, Ischiocondylar",
author = "Stephen Broski and Murthy, {Naveen S} and Aaron Krych and Obey, {Mitchel R.} and Collins, {Mark S.}",
year = "2016",
month = "2",
day = "1",
doi = "10.1007/s00256-015-2291-5",
language = "English (US)",
volume = "45",
pages = "213--219",
journal = "Skeletal Radiology",
issn = "0364-2348",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - The adductor magnus “mini-hamstring”

T2 - MRI appearance and potential pitfalls

AU - Broski, Stephen

AU - Murthy, Naveen S

AU - Krych, Aaron

AU - Obey, Mitchel R.

AU - Collins, Mark S.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Objective: To examine the anatomic MRI characteristics of the adductor magnus mini hamstring (AMMH) and explore its involvement in cases of hamstring avulsion. Materials and methods: An IRB-approved retrospective review of patients undergoing “hamstring protocol” MRI between March 2009 and June 2014 was performed. Two musculoskeletal radiologists recorded multiple AMMH anatomic characteristics and involvement in cases of hamstring avulsion. Results: Seventy-six AMMHs were analyzed in 66 patients [35 females and 31 males, mean age 49.3 ± 15.2 years (range 17–81)]. Eleven percent of AMMHs were poorly visualized, 51 % visualized, and 37 % well visualized. Seven percent demonstrated round, 73 % ovoid, and 21 % flat/lenticular tendon morphologies. Most (88 %) demonstrated typical origins. Average cross-sectional area (CSA) was 22.4 ± 10.6 mm² (range 6–56), diameter was 7.2 ± 2.5 mm (range 2.9–15), medial distance from the semimembranosus tendon was 7.5 ± 2.5 mm (range 3–14), and tendon length was 6.8 ± 3.3 cm (range 1.2–14.1). There was no gender difference in AMMH anatomic measurements or correlation between age and CSA or diameter. Of 17 complete hamstring avulsion cases, the AMMH was intact in 13, partially torn in 3, and completely torn in 1. Conclusion: The AMMH is a constant finding with variable anatomic characteristics. It is visualized or well visualized by MRI in 88 % of cases and is a sizable tendon located in close proximity to the semimembranosus tendon. Because it is uncommonly completely torn (6 %) in cases of complete hamstring avulsion, radiologists should be aware of its presence and appearance to avoid diagnostic confusion.

AB - Objective: To examine the anatomic MRI characteristics of the adductor magnus mini hamstring (AMMH) and explore its involvement in cases of hamstring avulsion. Materials and methods: An IRB-approved retrospective review of patients undergoing “hamstring protocol” MRI between March 2009 and June 2014 was performed. Two musculoskeletal radiologists recorded multiple AMMH anatomic characteristics and involvement in cases of hamstring avulsion. Results: Seventy-six AMMHs were analyzed in 66 patients [35 females and 31 males, mean age 49.3 ± 15.2 years (range 17–81)]. Eleven percent of AMMHs were poorly visualized, 51 % visualized, and 37 % well visualized. Seven percent demonstrated round, 73 % ovoid, and 21 % flat/lenticular tendon morphologies. Most (88 %) demonstrated typical origins. Average cross-sectional area (CSA) was 22.4 ± 10.6 mm² (range 6–56), diameter was 7.2 ± 2.5 mm (range 2.9–15), medial distance from the semimembranosus tendon was 7.5 ± 2.5 mm (range 3–14), and tendon length was 6.8 ± 3.3 cm (range 1.2–14.1). There was no gender difference in AMMH anatomic measurements or correlation between age and CSA or diameter. Of 17 complete hamstring avulsion cases, the AMMH was intact in 13, partially torn in 3, and completely torn in 1. Conclusion: The AMMH is a constant finding with variable anatomic characteristics. It is visualized or well visualized by MRI in 88 % of cases and is a sizable tendon located in close proximity to the semimembranosus tendon. Because it is uncommonly completely torn (6 %) in cases of complete hamstring avulsion, radiologists should be aware of its presence and appearance to avoid diagnostic confusion.

KW - Adductor magnus

KW - Hamstring

KW - Ischial tuberosity

KW - Ischiocondylar

UR - http://www.scopus.com/inward/record.url?scp=84951907562&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84951907562&partnerID=8YFLogxK

U2 - 10.1007/s00256-015-2291-5

DO - 10.1007/s00256-015-2291-5

M3 - Article

C2 - 26554947

AN - SCOPUS:84951907562

VL - 45

SP - 213

EP - 219

JO - Skeletal Radiology

JF - Skeletal Radiology

SN - 0364-2348

IS - 2

ER -