title: Hemi-hamate arthroplasty provides functional reconstruction of acute and chronic proximal interphalangeal fracture-dislocations.
abstract: OBJECTIVE
  Hemi-hamate resurfacing arthroplasty is a treatment alternative for the management of severe acute and chronic dorsal proximal interphalangeal (PIP) fracture-dislocations. This study was designed to determine whether this procedure would successfully restore function after such injuries.
  
  
  METHODS
  Hemi-hamate reconstructions were performed on 33 patients (mean age, 34 years) who presented to 1 hand surgery practice with dorsal PIP fracture-dislocations. Eligible patients experienced unstable dislocations with comminuted metaphyseal fractures involving at least 50% of the volar middle phalangeal surface that was not amenable to open reduction and internal fixation. We evaluated 22 patients with 14 acute (<6 weeks) and 8 chronic (mean, 30 weeks) injuries at a mean of 4.5 years (range, 1-7 years). Functional outcomes were assessed by objective and subjective measures: joint alignment/motion/stability, grip strength, Disabilities of the Arm, Shoulder, and Hand (DASH) scores, and visual analog scales (VAS) of pain and function.
  
  
  RESULTS
  After hemi-hamate reconstruction, active PIP motion averaged 70 degrees (acute 71 degrees , chronic 69 degrees ) with a mean flexion contracture of 19 degrees (range, 0 degrees to 80 degrees ). Active distal interphalangeal motion averaged 54 degrees (acute 56 degrees , chronic 51 degrees ). The mean VAS score for digit pain was 1.4 (acute 0.7, chronic 2.5). The mean DASH score of 5 (acute 2, chronic 9) and VAS functional score of 1.9 (acute 1.4, chronic 2.6) indicated little functional impairment (acute 2, chronic 9). Grip strength averaged 95% of the opposite hand. Mean coronal plane angulation at the PIP joint was 3 degrees . Ten patients reported aching with cold temperatures. One dissatisfied patient underwent revision surgery. Chronic reconstructions were associated with increased VAS pain ratings (p = .02) and higher DASH scores (p = .06).
  
  
  CONCLUSIONS
  Hemi-hamate reconstruction represents a valuable surgical procedure to address severe PIP joint fracture-dislocations. Reconstruction of chronic injuries by this method restores PIP function, albeit with more modest outcome performance.
  
  
  METHODS
  Therapeutic IV.
authors.affiliation: Department of Orthopedic Surgery, Division of Hand Surgery, Washington University School of Medicine, St. Louis, MO, USA. calfeer@wudosis.wustl.edu
authors.forename: R P
authors.initials: RP
authors.lastname: Calfee
authors.forename: T R
authors.initials: TR
authors.lastname: Kiefhaber
authors.forename: T G
authors.initials: TG
authors.lastname: Sommerkamp
authors.forename: P J
authors.initials: PJ
authors.lastname: Stern
mesh_terms: D000293:Adolescent; D000328:Adult; D001178:Arthroplasty; D015331:Cohort Studies; D005260:Female; D005384:Finger Joint; D005593:Fracture Fixation, Internal; D018460:Fractures, Comminuted / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D051225:Hamate Bone / Q000293:injuries* / Q000601:surgery*; D018737:Hand Strength; D006801:Humans; D057072:Intra-Articular Fractures / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D004204:Joint Dislocations / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult