Catherine N Petchprapa1, Seema Meraj2, Nidhi Jain3. 1. Hospital for Joint Diseases, Department of Radiology, New York University Langone Medical Center, 301 East 17th Street, 6th floor Room 600, New York, NY, 10003, USA. petchc01@nyumc.org. 2. Zwanger-Pesiri Radiology Group, 150 East Sunrise Highway, Lindenhurst, NY, 11757, USA. 3. New York University Langone Medical Center, Department of Radiology, New York University School of Medicine, 660 1st Avenue, New York, NY, 10016, USA.
Abstract
OBJECTIVE: Assess extensor carpi ulnaris (ECU) tendon position in the ulnar groove, determine the frequency of tendon "dislocation" with the forearm prone, neutral, and supine, and determine if an association exists between ulnar groove morphology and tendon position in asymptomatic volunteers. MATERIALS AND METHODS: Axial proton density-weighted MR was performed through the distal radioulnar joint with the forearm prone, neutral, and supine in 38 asymptomatic wrists. The percentage of the tendon located beyond the ulnar-most border of the ulnar groove was recorded. Ulnar groove depth and length was measured and ECU tendon signal was assessed. RESULTS: 15.8 % of tendons remained within the groove in all forearm positions. In 76.3 %, the tendon translated medially from prone to supine. The tendon "dislocated" in 0, 10.5, and 39.5 % with the forearm prone, neutral and supine, respectively. In 7.9 % prone, 5.3 % neutral, and 10.5 % supine exams, the tendon was 51-99 % beyond the ulnar border of the ulnar groove. Mean ulnar groove depth and length were 1.6 and 7.7 mm, respectively, with an overall trend towards greater degrees of tendon translation in shorter, shallower ulnar grooves. CONCLUSIONS: The ECU tendon shifts in a medial direction when the forearm is supine; however, tendon "dislocation" has not been previously documented in asymptomatic volunteers. The ECU tendon medially translated or frankly dislocated from the ulnar groove in the majority of our asymptomatic volunteers, particularly when the forearm is supine. Overall greater degrees of tendon translation were observed in shorter and shallower ulnar grooves.
OBJECTIVE: Assess extensor carpi ulnaris (ECU) tendon position in the ulnar groove, determine the frequency of tendon "dislocation" with the forearm prone, neutral, and supine, and determine if an association exists between ulnar groove morphology and tendon position in asymptomatic volunteers. MATERIALS AND METHODS: Axial proton density-weighted MR was performed through the distal radioulnar joint with the forearm prone, neutral, and supine in 38 asymptomatic wrists. The percentage of the tendon located beyond the ulnar-most border of the ulnar groove was recorded. Ulnar groove depth and length was measured and ECU tendon signal was assessed. RESULTS: 15.8 % of tendons remained within the groove in all forearm positions. In 76.3 %, the tendon translated medially from prone to supine. The tendon "dislocated" in 0, 10.5, and 39.5 % with the forearm prone, neutral and supine, respectively. In 7.9 % prone, 5.3 % neutral, and 10.5 % supine exams, the tendon was 51-99 % beyond the ulnar border of the ulnar groove. Mean ulnar groove depth and length were 1.6 and 7.7 mm, respectively, with an overall trend towards greater degrees of tendon translation in shorter, shallower ulnar grooves. CONCLUSIONS: The ECU tendon shifts in a medial direction when the forearm is supine; however, tendon "dislocation" has not been previously documented in asymptomatic volunteers. The ECU tendon medially translated or frankly dislocated from the ulnar groove in the majority of our asymptomatic volunteers, particularly when the forearm is supine. Overall greater degrees of tendon translation were observed in shorter and shallower ulnar grooves.
Authors: Kenneth S Lee; Robert H Ablove; Steven Singh; Arthur A De Smet; Benjamin Haaland; Jason P Fine Journal: AJR Am J Roentgenol Date: 2009-09 Impact factor: 3.959
Authors: Connie Y Chang; Ambrose J Huang; Miriam A Bredella; Susan V Kattapuram; Martin Torriani Journal: Skeletal Radiol Date: 2014-03-05 Impact factor: 2.199
Authors: Kenneth S Lee; Robert H Ablove; Steven Singh; Arthur A De Smet; Benjamin Haaland; Jason P Fine Journal: AJR Am J Roentgenol Date: 2009-09 Impact factor: 3.959