What is an incomplete dislocation of a joint called?

An incomplete dislocation of a joint is referred to as subluxation. This condition occurs when the bones in a joint are misaligned but still maintain some contact with each other, distinguishing it from a complete dislocation, where the bones are entirely separated. Subluxation can lead to pain and dysfunction in the affected joint, as the alignment is not correct despite the joint not being fully dislocated.

The other options do not pertain to joint dislocations. Sciatica refers to pain that radiates along the path of the sciatic nerve, often due to a herniated disc or other spinal issues. Adhesive capsulitis, also known as frozen shoulder, involves stiffness and pain in the shoulder joint, not a dislocation. Osteoarthritis is a degenerative joint disease characterized by the breakdown of cartilage and can lead to joint pain and stiffness, but it does not describe a specific joint dislocation. Thus, subluxation is the correct term for an incomplete dislocation.