Which of the following specialties would primarily deal with joint replacements?

The specialty that primarily deals with joint replacements is orthopedics. Orthopedic surgeons are medical doctors who specialize in diagnosing, treating, and managing conditions related to the musculoskeletal system, which includes bones, joints, ligaments, tendons, and muscles. Joint replacements, such as hip or knee replacements, fall within this domain as they are typically procedures carried out to relieve pain and restore function in patients with damaged or arthritic joints.

Neurology focuses on diseases and disorders of the nervous system, including the brain and spinal cord, rather than on joint-related issues. Oncology pertains to the diagnosis and treatment of cancer, which also does not include joint replacement surgery. Dermatology concentrates on skin conditions, which again is unrelated to orthopedic procedures like joint replacements. Therefore, orthopedics is the most appropriate specialty for joint replacements.