Can you join the military if you have had the Hyprocure surgery?

If the stent isn't considered an orthopedic implant, yes. If it is, no.
DODI 6130.30 is the standard.
20. MISCELLANEOUS CONDITIONS OF THE EXTREMITIES.
f. Current orthopedic implants or devices to correct congenital or post-traumatic orthopedic abnormalities (V43).
The only real way to find out is go to a recruiter and try to enlist without concealing the surgery and implant.

I'd wanted to go back in as clinical, with USPHS, and also trained under one of their O-6 level senior staff during my clerkships, unfortnately, I was never able, obviously....

What you're referring to is termed an arthroereisis...it's a subtalar implant used in the midfoot for midfoot arch correction...I'd been doctoral allied health before my total perm disability, we've since shut my license as a result, however, I was well trained on such procedures, though I unfortunately never got to assist with one in residency, though I assisted with some 200-300 surgeries overall, not solely lower extremity, numerous other clinical areas as part of enrichment training...the device osmt a stent, as !mentioned below, a stent is an intravascular device generally with a drug eluting coating, intended for intravascular surgery, I'd seen the usage of stent in one answer, and !erely thought to explain, unless there's some oher usage I might admittedly be unaware of...that being said, it is an orthopedic implant, so far as I'm aware, however, I'm uncertain of it being intended to be reversiblez as with a gastro lap band, which, by the way, are, as I've also learned, not all tat easily reversed...the circumstances of why he was dee!ed to need it would certainly need to be considered either by podiatry, or, more likely, lower-extremely orthopedics, orthopedists expressly lower extremity fellowship trained, have him look at http://www.AOFAS.org, that's their organization, those are physicians, there's a whole thing in podiatry about podiatric physician, however, that's a long winded debate I didn't want to get into here...podiatry, I'm fairly certain, depending on the state, can do arthroereisis procedures in an OR, however, they're relatively sophisticated procedures, plus, they have to be fairly carefully and relatively frequently checked, I believe, to make certain of osseous condition at the implant site, there are also doubtless numerous surgical sequelae that also need to be watched for, so, I'm not entirely certain how the svcs view them now, it'd likely need quite possibly, I'd expect, a Surgeon Genl eval and quite possibly waiver, however, that's purely a guess on my part, at the moment...beyond that, such procedures would quite clearly need expert opinion and workup, incl imaging, gait analysis, most esp...I hope all that was of at least some use, please understand, I only give you all that in an effort to be helpful, and to merely inform, so you and tour friend would have at least a reasonable clue of where to start looking, and what questions to ask, what you'd raised was obv very highly specialized, something comparatively few on here would've been aware of to that extent, which was why I'd merely thought to explain those basic aspects of the overall topic, that's all I'm trying to say, I've been total perm disabled quite some time now, however, as I'd said, I was very heavily exposed to that level of surgical procedure, as well as numerous related aspects, albeit quite some time ago, I merely thought you your friend might find it of use, purely for very basic informational purposes only, to at least you both get started in the reasonably right direction, whether such a device would be allowed at all, I have, of course, absolutely no idea, certainly, I merely also thought to make that quite clear, hope was of help, many thanks.