SINGAPORE - Ms Ho Ching sported a sling when she accompanied her husband Prime Minister Lee Hsien Loong on a visit to Changi Airport on Monday (Feb 8) morning.
Her left elbow was injured in a hoverboard accident, she revealed in a Facebook post.
She wrote: "Had a difference of opinion with one of my hoverboards three weeks ago - I wanted to step down and it decided to do a spin!"
Her arm is now in a "flex frame 'cast'" as it mends.
Giving details of her recovery, she wrote: "First week on half open cast to give space for swelling of arm; Second week full cast to stabilise elbow joint;
"Now on flex frame 'cast' to enable the elbow to do controlled flexing to minimise risk of frozen elbow as it heals."
Posing with a Stormtrooper from the Star Wars movie at the airport, she joked: "Playing one-arm trooper with an armed stormtrooper at Changi Airport this morning. Must remember to respect temperamental hoverboards!"
Hoverboards, or self-balancing e-scooters, have gained in popularity, but there have been safety concerns about the devices.
Some say they are a hazard to riders and pedestrians.
A number of airlines have banned travellers from bringing them on board flights amid reports of boards catching fire in Britain and the United States.