As I mentioned before, I cracked my Tibia, tore my ACL, partially torn Meniscus, and also another torn cartilage while playing b-ball 35 years ago .... ACL had atrophied by the time I was out of a cast and the knee scoped. So my ACL was removed, and the cartilages "cleaned up" and I was customed fitted (cast made) with a Lennox-Hill knee brace and did tons of rehab to build the knee muscles up over 6 months time. My b-ball daze were over as I found out on my 3rd strike on the court ... the knee brace prevented a real "blow out", but no ACL
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X-rays compared with the first X-rays show the bone wear, and beginning of build-up which the excellent surgeon said would cause arthritis later on if I continued to run, etc. .... I knew b-ball, volleyball, etc. was over .... that ends my tale of woe
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Cycling did NOT stress my knee, nor doing everyday stuff like walking .... so I've lived 35 years missing my ACL, meniscus, etc. and have been just fine.
Rehab that knee like a pro, don't be afraid to get a 2nd opinion (I had two excellent Drs. because I moved back to NC in between injuries and post surgery), and best of luck to you. I don't know how a PCL impacts the knee like losing the ACL does, but 99% of the time.... I've never missed not having mine.
That leg is still more muscular and defined .... did I mention rehab it like like a pro.
Best to you and good luck!