title: A simple pre-operative imaging method to assess donor and recipient anatomy in hemi-hamate arthroplasty for proximal interphalangeal joint reconstruction.
abstract: OBJECTIVE
  Post-traumatic arthritis is common in long-term follow-up of patients undergoing hemi-hamate arthroplasty (HHA). We hypothesize that anatomic mismatch could play a role in the development of arthritis. The purpose of this study is to establish a novel, computed tomography (CT)-based imaging technique for pre-operative assessment in HHA. With this technique, our group aims to identify digits with a high likelihood for anatomical mismatch between the donor graft and recipient interphalangeal joint. Using this technique to eliminate cases with high-likelihood of incongruent anatomy, we hypothesize the rates of arthritis could be reduced.
  
  
  METHODS
  We conducted a retrospective review of upper extremity CT scans from 2007 to 2014 at our institution. Those studies meeting our inclusion criteria were exported to a clinical radiology software suite. Subsequently, angular and linear measurements of the hamate and potential recipient proximal interphalangeal joints were collected. Angular and linear comparisons were then made between the donor hamate graft and the individual recipient sites. Using pre-established cutoff values, matches were deemed to be inconsistent or consistent.
  
  
  RESULTS
  The study included 31 CT scans. The rate of anatomical consistency was low; the small finger was most often consistent (38.7 %) and the index finger was least often consistent (12.9 %). Linear inconsistency was common in all joints besides the small finger; angular inconsistency was most prevalent in the index and long fingers.
  
  
  CONCLUSIONS
  This novel use of CT scans as a tool for pre-operative HHA planning is a crucial first step in trying to reduce the observed rates of arthritis after HHA.
authors.affiliation: Department of Plastic and Reconstructive Surgery, The Johns Hopkins School of Medicine, University of Maryland Plastic Surgery Residency, 4940 Eastern Ave, Room A518, Baltimore, MD, 21224, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Calva
authors.affiliation: Department of Plastic and Reconstructive Surgery, The Johns Hopkins School of Medicine, University of Maryland Plastic Surgery Residency, 4940 Eastern Ave, Room A518, Baltimore, MD, 21224, USA. calottan@jhmi.edu.
authors.forename: Nicholas
authors.identifier: http://orcid.org/0000-0002-8880-3216
authors.initials: N
authors.lastname: Calotta
authors.affiliation: Department of Plastic and Reconstructive Surgery, The Johns Hopkins School of Medicine, University of Maryland Plastic Surgery Residency, 4940 Eastern Ave, Room A518, Baltimore, MD, 21224, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Lopez
authors.affiliation: Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.
authors.forename: Adrienne
authors.initials: A
authors.lastname: Christopher
authors.affiliation: Department of Radiology and Radiological Science, The Johns Hopkins School of Medicine, Baltimore, MD, USA.
authors.forename: Donna
authors.initials: D
authors.lastname: Magid
authors.affiliation: Department of Radiology and Radiological Science, The Johns Hopkins School of Medicine, Baltimore, MD, USA.
authors.forename: Shadpour
authors.initials: S
authors.lastname: Demehri
authors.affiliation: Department of Plastic and Reconstructive Surgery, The Johns Hopkins School of Medicine, University of Maryland Plastic Surgery Residency, 4940 Eastern Ave, Room A518, Baltimore, MD, 21224, USA.
authors.forename: Scott D
authors.initials: SD
authors.lastname: Lifchez
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001168:Arthritis / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D005383:Finger Injuries / Q000601:surgery*; D005384:Finger Joint / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery; D051225:Hamate Bone / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D062785:Hemiarthroplasty / Q000009:adverse effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010934:Planning Techniques; D011300:Preoperative Care; D057234:Preoperative Period; D012189:Retrospective Studies; D014019:Tissue Donors; D014057:Tomography, X-Ray Computed; D055815:Young Adult
keywords: Hemi-hamate arthroplasty; Post-traumatic arthritis; Pre-operative planning; Upper extremity CT scan