COMPLEX CASES 1. Avascular necrosis of femoral head 2. Secondary Osteo Arthritis with Fibular graft in the neck 3. Post Tubercular Arthritis 4. Ankylosing Spondylitis 5. Secondary Osteo Arthritis with a big cyst in the head 6. Extensive Avascular necrosis 7. Acetabular Fracture causing Arthritis