title: Early outcomes of pyrolytic carbon hemiarthroplasty for the treatment of trapezial-metacarpal arthritis.
abstract: OBJECTIVE
  Pyrolytic carbon implants have been successfully used in the treatment of osteoarthritis of the metacarpophalangeal and proximal interphalangeal joints. Recently, pyrolytic carbon hemiarthroplasties have been proposed for the treatment of osteoarthritis of the trapezial-metacarpal (TM) joint of the thumb. We wished to review our short-term outcomes for this device in the treatment of TM arthritis.
  
  
  METHODS
  Fifty-four arthritic TM joints in 49 patients, with a mean age of 59 years, were treated with use of a pyrolytic carbon hemiarthroplasty procedure. Underlying diagnoses included osteoarthritis in 44 thumbs, rheumatoid arthritis in 8 thumbs, psoriatic arthritis in 1 thumb, and juvenile rheumatoid arthritis in 1 thumb. The patients were followed up clinically as well as radiologically for an average of 22 months postoperatively.
  
  
  RESULTS
  The overall 22-month survival rate excluding scaphotrapezio-trapezoidal joint arthritis was 80% according to a Kaplan-Meier analysis. Ten metacarpal subluxations were observed. Seven of these cases were salvaged by increasing the depth of the trapezial cup. A total of 15 reoperations were required in this cohort. No complications were seen in the patients with inflammatory arthritis. Thirty-five patients were pain free at the latest follow-up, and 6 reported mild to occasional pain with repetitive activities. The overall satisfaction rate was 40 of 49 patients (81%). Grip strength recovered to 86% of that of the contralateral side. Apposition key and opposition pinch strength improved to 92% and 95%, respectively, of those of the contralateral hand.
  
  
  CONCLUSIONS
  Pyrolytic carbon thumb arthroplasty may prove to be an acceptable option for the treatment of TM, although a high complication rate was observed in this early cohort, with many cases of subluxation attributed to the creation of a too shallow trapezial cup. Further comparative studies are warranted.
  
  
  METHODS
  Therapeutic IV.
authors.affiliation: Division of Plastic Surgery and the Department of Orthopedic Surgery, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Martinez de Aragon
authors.forename: Steven L
authors.initials: SL
authors.lastname: Moran
authors.forename: Marco
authors.initials: M
authors.lastname: Rizzo
authors.forename: Kirsten B
authors.initials: KB
authors.lastname: Reggin
authors.forename: Robert D
authors.initials: RD
authors.lastname: Beckenbaugh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001168:Arthritis / Q000503:physiopathology / Q000601:surgery*; D019643:Arthroplasty, Replacement / Q000009:adverse effects / Q000379:methods*; D001672:Biocompatible Materials; D002244:Carbon; D052737:Carpometacarpal Joints / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D007595:Joint Prosthesis; D008297:Male; D050279:Metacarpal Bones / Q000503:physiopathology / Q000601:surgery; D008875:Middle Aged; D010147:Pain Measurement; D017060:Patient Satisfaction; D016059:Range of Motion, Articular / Q000502:physiology; D012086:Reoperation; D012189:Retrospective Studies; D013933:Thumb / Q000503:physiopathology / Q000601:surgery; D051222:Trapezium Bone / Q000503:physiopathology / Q000601:surgery
chemical_list: D001672:Biocompatible Materials; C009139:pyrolytic carbon; D002244:Carbon