For weights, they can use a knapsack, even their mother’s purse, starting with 1 or 2 pounds (or no weights if they are very sore). "This will go a long way toward helping them mend," he said.
Dr. Phillips advises avoiding weight machines where they kick their legs out, which is like getting up from a sitting position; squats; or stair climbing. He tells families that patellofemoral problems wax and wane, and "very rarely" require surgery, and he encourages a lot of rehabilitation before considering a recommendation for any type of surgery.
Dr. Phillips said he had no relevant disclosures.