Question

The patient is a 42-year-old male with a history of left shoulder osteomyelitis with resistant Pseudomonas from an injury he sustained approximately 20 years ago.
which are prepositons and conjunctions?
? none?
Ms. Sue
This sentence has 4 prepositions.

Please check this site for a list of prepositions.

http://www.englishclub.com/grammar/prepositions-list.htm

You're right that there are no conjunctions in this sentence.