You may benefit from alloplastic joint replacement if you suffer from one of the following conditions.nnInflammatory arthritis (such as rheumatoid arthritis) of the TMJs not responsive to other treatmentnImmobility of the joints (fibrous and/or bony ankylosis) not responsive to other treatmentnFailed TMJ reconstructions using body tissue such as bone, muscle, or cartilagenFailed TMJ reconstructions using joints or other implants made from man-made materialsnLoss of correct jaw position due to bone loss (resorption), trauma, developmental abnormality, or tumor