• Hip Impingement (most common)

• Tear of the joint labrum – or labrum tear often in the context of impingement syndrome of the hip
• Cartilage damage caused by impingement syndrome, hip dysplasia or childhood hip disorders.
• Internal Snapping Hip – internal hip snapping caused by tendon jumping directly at the joint or labrum tear
• Free Joint Bodies – causes snapping, cracking
• PVNS – pigmented villonodular synovitis – proliferation of the synovial membrane, which can be locally destructive (rare)

• Rectus emulsion: Torn out bone tendon of a thigh muscle, which can later simulate an impingement syndrome (subspine impingement)
• Ischiofemoral Impingement – pinching of the soft tissues between the ischium and the femur
• External Snapping Hip – Hip snapping is caused externally to the hip (tractus iliotibialis).
• Sports Hernia – Athletes’ groin or “sportsmen’s hernia Irritation of the ilioinguinal and iliohypogastric nerve due to too loose support of the nerve. No actual hernia (break).
• Athletic Pubalgia – pain in the middle of the pubic bone
• Ischial Pain – irritation or tearing of the tendons of the posterior thigh muscles, rarely bursitis
• Piriformis Syndrome – deep buttock pain with hip flexion

• Hip Osteoarthritis – wear and tear of the cartilage of the hip joint. This can be painful however not visible on the x-ray. Or it is overstrechted and is easily visible on the x-ray. 
• Tear of the Tendons of the Gluteal Muscles (musculus gluteus medius/ minimus) – or wear at the tendon insertion
• Piriformis Syndrome – deep buttock pain with hip flexion
• Spinal Problems – disc degeneration, spinal stenosis or arthrosis of the small vertebral joints, these can radiate into the hip region.

When the source of pain is unclear, the possibility of infiltrating (injecting) the hip joint with local anaesthetic exists.

In some cases, radiological imaging reveals visible changes in both the hip and the lumbar spine. Possibly there are complaints of the cross or lumbar spine, which can radiate into the hip. Here too, a so-called test infiltration into the hip joint is helpful. This eliminates complaints originating in the hip joint, but not pain whose cause lies outside the joint.

If the pain improves significantly for about 1.5 hours afterwards, the test is positive. This means that the pain originates from the hip joint.