A lateral support assembly for attachment to a wheelchair includes a mounting portion for attachment to the wheelchair, a pad support portion for attachment to a pad, and a link sub-assembly including one or more links that connect the mounting portion to the pad support portion. The mounting portion includes an attachment part, a hinged part, and a sliding part. The attachment part is adapted to be affixed to the wheelchair and the hinged part is connected to the attachment part and is selectively pivotable about a first rotational axis. The pad support portion includes a pad bracket coupled to a secondary housing in which the pad bracket is selectively pivotable about a second rotational axis. The sliding part is connected to the hinged part and is selectively extendable forward.