title: A modular surface gliding implant (CapFlex-PIP) for proximal interphalangeal joint osteoarthritis: a prospective case series.
abstract: OBJECTIVE
  To evaluate the one-year postoperative clinical and patient-rated outcomes in patients receiving proximal interphalangeal (PIP) joint arthroplasty with a modular surface gliding implant, CapFlex-PIP.
  
  
  METHODS
  10 patients each with primary osteoarthritis of a single PIP joint were assessed preoperatively (baseline), at 6 weeks, and 3, 6, and 12 months after CapFlex-PIP arthroplasty for lateral stability and range of motion of the affected digit. In addition, patients rated their pain using a numeric rating scale and function and overall assessment of their treatment and condition using the quick Disabilities of the Arm, Shoulder and Hand (QuickDASH) and Patient Evaluation Measure (PEM) questionnaires, respectively.
  
  
  RESULTS
  The mean baseline active mobility of the affected PIP joint increased from 42° to 51° by one year, although this change was not significant. Patients reported reduced pain at one year, which was statistically significant. There was also a significant improvement between baseline and one-year QuickDASH (43 points vs 15 points, respectively) and PEM scores (51 vs 25 points, respectively). Absent or low lateral instability was observed in 9 joints at follow-up. All implants remained intact over the one-year postoperative period and there was no migration, osteolysis, or implant fracture. After study completion, 2 patients underwent tenolysis.
  
  
  CONCLUSIONS
  Patients experienced a significant reduction in pain and a trend towards increased mobility. All implants showed complete osteointegration without evidence of radiological migration. Lateral stability improved.
  
  
  METHODS
  Therapeutic IV.
authors.affiliation: Department of Upper Extremities and Hand Surgery, Schulthess Clinic, Zurich, Switzerland; Department of Research and Development, Schulthess Clinic, Zurich, Switzerland. Electronic address: Stephan.Schindele@kws.ch.
authors.forename: Stephan F
authors.initials: SF
authors.lastname: Schindele
authors.affiliation: Department of Upper Extremities and Hand Surgery, Schulthess Clinic, Zurich, Switzerland; Department of Research and Development, Schulthess Clinic, Zurich, Switzerland.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Hensler
authors.affiliation: Department of Upper Extremities and Hand Surgery, Schulthess Clinic, Zurich, Switzerland; Department of Research and Development, Schulthess Clinic, Zurich, Switzerland.
authors.forename: Laurent
authors.initials: L
authors.lastname: Audigé
authors.affiliation: Department of Upper Extremities and Hand Surgery, Schulthess Clinic, Zurich, Switzerland; Department of Research and Development, Schulthess Clinic, Zurich, Switzerland.
authors.forename: Miriam
authors.initials: M
authors.lastname: Marks
authors.affiliation: Department of Upper Extremities and Hand Surgery, Schulthess Clinic, Zurich, Switzerland; Department of Research and Development, Schulthess Clinic, Zurich, Switzerland.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Herren
mesh_terms: D000368:Aged; D050806:Arthroplasty, Replacement, Finger / Q000379:methods*; D004185:Disability Evaluation; D005260:Female; D005384:Finger Joint / Q000601:surgery*; D005500:Follow-Up Studies; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery*; D010147:Pain Measurement; D017060:Patient Satisfaction; D011183:Postoperative Complications / Q000503:physiopathology; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology
keywords: Arthroplasty; case-series; proximal interphalangeal joint; surface replacement