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Narrated Abu Buraydah:
I heard the Messenger of Allah (ﷺ) say: A human being has three hundred and sixty joints for each of which he must give alms…   
[Sunan Abi Dawud 5242]
Prior to 1995 it was thought that there are 340 joints in the human body. In 1995 a scientific institute proved that the internal ear consists of 10 joints each (made up of cartilaginous matter). Thus 20 joints were added,  and the discovery was made that the human body consists of 360 joints.
The Prophet (PBUH) said that the number of joints in the human body is 360, although at that time it was impossible to know such information, for most of the joints are very small and hard to see with the naked eye. 
The exact number of joints was not discovered until development in the fields of anatomy and histology. 
This Hadith clearly shows the truthfulness of the Prophet Muhammad [PBUH], revealing knowledge of the human body long before science discovered it, 
and showing the divine knowledge that Allah granted him.