Patellar tendinitis is an injury to the tendon connecting your kneecap (patella) to your shinbone, is a relatively common cause of pain in the inferior patellar region in athletes. It is common with frequent jumping and studies have shown it may be associated with stiff ankle movement and ankle sprains.
Pain is the first symptom of patellar tendinitis, usually between your kneecap and where the tendon attaches to your shinbone (tibia). Anterior knee pain over the patella tendon, Pain made worse with jumping, landing or running activity and sometimes with prolonged sitting, Onset of pain is usually gradual and commonly related to an increase in sport activity.
Approximately 50% of ACL injuries occur with injuries to other structures in the knee. The meniscus (50% of multi-structure injuries), medial collateral ligament (30%), or articular cartilage (30%) are the most frequently concurrently injured structures.