Two conditions commonly cause knee pain in children and adolescents, "Osgood-Schlatter Disease" and "Chondromalacia Patella".
In Osgood-Schlatter Disease, the affected age is from 9-15 years and pain, tenderness and swelling is experienced just below the knee. This is actually the patellar (knee cap) tendon pulling away from it's bony attachment on the tibia. Chiropractors can effectively treat this condition through manual therapies including therapeutic quadriceps stretching and exercises. There is also an Osgood-Schlatter support which helps minimize stress on the tendinous insertion.
Chondromalacia patella is common in adolescent females and young adults. In this condition, the underside of the patella (knee cap) begins to roughen and become painful. There is generally deep knee pain which is made worse by climbing or descending stairs as well as sitting with the knee flexed for extended periods of time. This condition can worsen and it should receive corrective care which focuses on correcting any biomechanical faults and stresses present in the spine, hip, knee and foot.