T2 relaxation time mapping of the cartilage cap of osteochondromas

Hee Kyung Kim, Paul Horn, Bernard J. Dardzinski, Dong Hoon Kim, Tal Laor

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Objective: Our aim was to evaluate the cartilage cap of osteochondromas using T2 maps and to compare these values to those of normal patellar cartilage, from age and gender matched controls. Materials and Methods: This study was approved by the Institutional Review Board and request for informed consent was waived. Eleven children (ages 5–17 years) with osteochondromas underwent MR imaging, which included T2-weighted fat suppressed and T2 relaxation time mapping (echo time = 9–99/repetition time = 1500 msec) sequences. Lesion origins were femur (n = 5), tibia (n = 3), fibula (n = 2), and scapula (n = 1). Signal intensity of the cartilage cap, thickness, mean T2 relaxation times, and T2 spatial variation (mean T2 relaxation times as a function of distance) were evaluated. Findings were compared to those of patellar cartilage from a group of age and gender matched subjects. Results: The cartilage caps showed a fluid-like high T2 signal, with mean thickness of 4.8 mm. The mean value of mean T2 relaxation times of the osteochondromas was 264.0 ± 80.4 msec (range, 151.0–366.0 msec). Mean T2 relaxation times were significantly longer than the values from patellar cartilage (39.0 msec) (p < 0.0001). These findings were observed with T2 spatial variation plots across the entire distance of the cartilage cap, with the most pronounced difference in the middle section of the cartilage. Conclusion: Longer T2 relaxation times of the cartilage caps of osteochondromas should be considered as normal, and likely to reflect an increased water content, different microstructure and component.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalKorean journal of radiology
Issue number1
Publication statusPublished - 2016 Jan 6

Bibliographical note

Publisher Copyright:
© 2016 The Korean Society of Radiology.


  • Cartilage cap
  • Osteochondroma
  • T2 relaxation time mapping

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


Dive into the research topics of 'T2 relaxation time mapping of the cartilage cap of osteochondromas'. Together they form a unique fingerprint.

Cite this