Osteochondritis Dissecans of Knee Prospective Cohort

Patients will be recruited and consented at the visit in which their eligibility is
determined. Once a patient is eligible and provides informed consent, he or she will be in
the study for up to 50 years, or until his or her OCD lesion is healed successfully.

At the initial visit, a subject will complete a basic medical history form, and three
questionnaires: the IKDC Subjective questionnaire (ages over 18) or the PEDI-IKDC Subjective
questionnaire (ages under 18); the KOOS questionnaire; and the Marx Activity Scale (adult) or
Pedi-FABS Scale (pediatric). Patients will then continue with their normal course of care as
determined by their surgeon and care team.

Mandatory surveys (same as above) will be collected from patients at 2 years, 5 years, 10
years, and 25 years. Patients who cannot return to clinic will have the option to complete
the assessments and return in pre-stamped and addressed return envelopes provided by the
clinical site the subject is a patient at. Any other follow-up visits between these time
intervals will also be options for patients to complete these assessments, however patients
will not complete them any closer than intervals 12 weeks apart in order to prevent
redundancy.

Additionally, at the initial visit, the surgeon will complete a routine patient history and
physical exam, which will be collected. Any surgical procedures or physical therapy a patient
undergoes for treatment of his or her OCD lesion will also be documented and collected. At
follow-up visits, surgeons will complete their own physical exam follow-up assessment forms,
which will be collected.

Inclusion Criteria:

- Diagnosis of osteochondritis dissecans or focal articular cartilage defects as
confirmed by x-ray or MRI

Exclusion Criteria:

- Non-confirmed diagnosis (i.e. patient does not yet have imaging confirmation)