Schultz metacarpophalangeal arthroplasty: a long-term follow-up study.
We describe a prospective, long-term evaluation of the Schultz metacarpophalangeal joint implant. The prosthesis is a semiconstrained, cemented implant with a ball-in-socket articulation. Thirty-six implants were followed for an average of 10.9 years. There was a progressive decrease in range of motion and strength and a recurrence of ulnar deviation. The neck of the proximal phalangeal component fractured in 39% of the joints. Periarticular heterotopic bone formed in all joints, but was extensive in only 22%. Although some lucency of the bone-cement interface was seen in 80% of the joints, no prosthetic loosening occurred in this series. Our results indicate that long-term, intramedullary cement fixation of relatively long-stemmed components can be satisfactory. However, the articulated portion of this implant does not consistently withstand the stresses transmitted across the joint and does not provide long-term joint stability.
Adams
B D
BD
Department of Orthopedic Surgery, University of Iowa Hospitals and Clinics, Iowa City.
Blair
W F
WF
Shurr
D G
DG
D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000503:physiopathology / Q000601:surgery*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis / Q000379:methods; D008297:Male; D008662:Metacarpophalangeal Joint / Q000601:surgery*; D008875:Middle Aged; D009068:Movement; D011475:Prosthesis Failure
D001843:Bone Cements