Not knowing where you are at, I figure I would put out 2 options as not knee but ankle injuries and know how horrible it can be driving!

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https://www.tristateortho.com/?l=ouc Walk in clinics off McKnight Road and in Seven Fields (up Cranberry way) from 4:30-6:30p

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https://www.steelcityspine.com/contents/ortho-asap-quick-care Ortho Walk-in's on Monday and Friday 8am-3pm at St Clair Hospital and in Washington by the Meadows, but you probably don't want to wait until Friday.

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The 1st one actually has a bunch of offices not just in the North Hills also, and I personally never really had a problem getting seen at one in a decent time frame if north doesn't work for you, wouldn't hurt to call in the morning if you are out of other options!