Cat asking for help

One day, a stray cat came to our door meowing very loudly. He was clearly asking for help.
An update on this cat's situation:
https://www.youtube.com/watch?v=UD45n...
All the details are written in the video.
Here is a copy of all the texts that are written in the video:
On February 25, 2017 a stray cat came to our door, meowing very loudly. His left rear leg was injured. We took him to the vet. The vet examined the cat and took X-Rays. She said there was no bone damage in the left rear leg and that probably some other cat bit him in the leg and the wound got infected, hence the swelling. She also said there were some old wounds on the left side of his body and a bone fracture in his left front leg which probably happened weeks ago, hence the limping. But it had started to heal. The vet started the antibiotic treatment and gave him some medication for internal and external parasites because there were lots of fleas and ticks on him ( Like he didn't have enough problems. Damn you blood-sucking parasites!). The cat stayed at the clinic for two nights. On February 27, I went to the clinic again.
After the cleansing, I took him home. And we continued the antibiotic treatment, we gave him intramuscular injections two times a day for 5 days. At first he couldn't put any weight on his left rear leg.
I cleansed the wound with antiseptics 3 times a day. He cleansed the wound with his tongue 30 times a day.
Then he started to run.
At the end of the five-day treatment, we went to the vet again. She said the wound looked fine and we stopped the antibiotics. The cat was ready to go outside because it was March and it was very difficult to keep him indoors so we let him out. Now he lives in our garden with other cats.

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Music:

Impromptu in Blue by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
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Prelude No. 6 by Chris Zabriskie is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
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Life of Riley by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
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