A new distal radioulnar joint prosthesis.

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Reconstructive surgery

Background:

• Distal radioulnar joint (DRUJ) pain and instability are common after distal radius fractures.
• Existing soft tissue procedures and ulnar head prostheses have variable success rates and stability issues.

Purpose of the Study:

• To evaluate the efficacy and safety of a newly designed two-part distal radioulnar prosthesis.
• To assess improvements in forearm function, pain, and patient-reported outcomes following implantation.

Main Methods:

• A prospective study involving 19 patients implanted with a novel two-part distal radioulnar prosthesis.
• Patients were divided into three groups (A, B, C) based on design modifications during the study.
• Outcomes including pain scores, grip strength, forearm function, and Disabilities of the Arm, Shoulder, and Hand (DASH) scores were assessed.

Main Results:

• Prosthetic loosening necessitated removal in all five patients in group B.
• Only two prostheses in group C required removal for non-prosthetic reasons.
• The 12 patients retaining their prosthesis showed increased forearm function, significantly improved grip strength, and decreased pain scores.
• Disabilities of the Arm, Shoulder, and Hand (DASH) scores improved but remained high.

Conclusions:

• The designed prosthesis represents a viable new treatment option for managing ulnar instability after distal ulnar resection.
• Further design refinements may be necessary to address issues of loosening observed in earlier iterations.