PMC7852405_01
Sagittal MRI slice (T1 fat suppression) of the left knee showed massive synovitis where the thorn fragment was located.
jbji-6-51-g01.jpg
PMC7852405_01_jbji-6-51-g01.jpg
Ch1.F1
A second MRI showed persistent massive synovitis and accumulation of fluid, especially posteriorly (Fig. 1).
Thorn fragment (4.5 mm) removed during arthrotomy from the suprapatellar pouch.
jbji-6-51-g02.jpg
PMC7852405_01_jbji-6-51-g02.jpg
Ch1.F2
After completing the dorsal approach and opening the front of the knee, a 4.5 mm thorn fragment was found in the area of synovitis within the suprapatellar pouch (Fig. 2).
Robinia pseudoacacia, commonly
known as black locust, populated with Pantoea agglomerans. Picture from place of accident near Zurich, Switzerland.
jbji-6-51-g03.jpg
PMC7852405_01_jbji-6-51-g03.jpg
Ch1.F3
The thorns belonged to a plant known as Robinia pseudoacacia, a widespread neophytic hardwood tree, commonly known as black locust (Fig. 3).