I'd say it depends on the problem and the degree of severity...... I see a lot of bizarre lamenesses here, I haven't quite figured out a flow chart but I usually need to put my hands on them and watch them walk up and back once or twice.
*IF* the problem is an ACL/CCL tear there's stifle swelling but not non-weight-bearing lameness. According to the literature some will heal given confinement and time (50/50, I think). Diagnosis of a CCL tear may be made easier by noticing animals tend to improve with exercise (and then are worse the next time they get up from rest).
Don't rule out toe or sole abscesses depending on the terrain the animal was on. In horses, it's said 90% of lameness is below the fetlock... I don't think it works quite that way in cattle, or else I just see the miscellaneous crap that didn't recover with a normal treatment regimen.
If the stifle is swollen and the animal is non-weight-bearing or has no/very limited mobility of the joint, it's typically septic (infected) and the best option is shipping the animal. ASAP.
I can't seem to get good stifle rads in any age, elbow/shoulder depends on size, otherwise anything below the knee or hock is simple to radiograph and determine whether bone involvement is the cause of the lameness... if you can't figure out why the animal is lame and it hasn't responded to your typical treatment protocol, take it to your vet. We can radiograph legs pretty easy.
Of course don't rule out complete or partial fractures of associated bones when there's swelling. I probably see a fracture or two a week - everything from a partial tibia fracture to pastern fractures - lots of septic joints in all ages of cattle, occasional hoof puncture wounds (needles, nails), miscellaneous injuries and lacerations of all types. Time in conjunction with appropriate treatment heals many problems, but it's important to identify the ones that are going to get worse with time...