Hip:
OA (osteoarthritis)
Bursitis
Labral tear
Hip impingement
Snapping hip syndrome
Knee:
OA
Meniscus tear
Ligament sprain or tear (ACL, PCL, MCL, LCL)
Patellar tendinitis
Patellofemoral pain syndrome
Osgood-Schlatter disease
ITB syndrome
Foot & Ankle:
Sprains
Achilles tendinopathy
Peroneal tendinopathy
Ankle impingement syndrome
Fractures