A 70 yrs male patient has single well defined lytic lesion of skull. The patient had no other complaint and urine examination had no abnormality. What is the most likely diagnosis?

Orthopaedics

A 70 yrs male patient has single well defined lytic lesion of skull. The patient had no other complaint and urine examination had no abnormality. What is the most likely diagnosis?

What is the use of the given instrument:

Which fracture results in the given deformity?

Positive pivot shift test in knee is because of injury to -