Why rest alone recurs
Apophysitis is fundamentally a load-capacity mismatch: the demand placed on the growth plate exceeds what it currently tolerates. Removing all load closes the gap by lowering demand to zero, which is why pain settles within a couple of weeks.
But capacity also falls during rest. Tendon stiffness, muscle strength and neuromuscular control all decline. When the athlete returns to their previous training load, usually straight into a match, the mismatch is wider than before. This is the recurrence pattern most parents describe: settles over the holidays, flares within a fortnight of the new season.
The alternative: relative rest with progressive loading
- Reduce, don't remove. Cut the aggravating high-impact volume by roughly 50% rather than stopping sport.
- Add isometric holds early, they reduce pain and maintain strength when dynamic loading is too irritable.
- Progress to slow, heavy, controlled resistance work through full available range.
- Reintroduce speed, plyometrics and change of direction last, in that order.
The 24-hour rule
Pain during rehab is acceptable up to about 3–4 out of 10, provided it settles to baseline within 24 hours and morning stiffness is not worse the next day. If either fails, the previous session was too much, reduce volume by around 20% and repeat that stage rather than dropping back to rest.
Typical timelines
- Sever's disease: 6–8 weeks with structured load management.
- Osgood–Schlatter: 8–12 weeks with progressive loading; the bony bump often persists and is not itself a problem.
- Sinding-Larsen–Johansson: 8–12 weeks with a tendon-loading programme.
- Patellofemoral pain: around 12 weeks of hip and quadriceps strengthening.