Having a heel spur doesn’t create the inflammation that occurs in an area or that radiates to the underfoot. It is documented that in some cases a bone spur of up to 1cm on both heels only illicits pain in a single foot. Some say as little as 5% of bone spurs result in inflammation and painful conditions. The issue comes about when a bony formation occurs close to or at the site of a tendinous insertion. Its not necessarily that the spur irritates the tendon, moreso it creates a bio-mechanic (the way that an articulation/joint moves or operates) that can create an inflammatory response or ask too much of a tendon/muscle to overperform. So indeed you are often not necessarily treating the spur but the condition that is being caused by it.
Plantar Fasciitis is the most common of injuries in people who run and jump. Court sports persons and runners in general suffer from this condition which is an inflammation of the connective tissue that covers the underside of the foot. The condition is usually diagnosed by intense pain upon placing your foot down on the floor when you first wake up in the morning. Slight limping until the fascia warms up and becomes malleable is a certain indicator and it can leave you unable to walk for a brief time in the morning hours. Continuing to ignore this condition can result in a tear which will leave you unable to place any weight on the foot without intense pain.