title: Perilunate fracture-dislocations of the wrist: comparison of temporary screw versus K-wire fixation.
abstract: OBJECTIVE
  Temporary intercarpal screw fixation has been suggested as an alternative to temporary K-wire fixation in the treatment of perilunate wrist dislocations. We compared the 2 treatment methods in 2 retrospective cohorts with a null hypothesis that there would be no difference in final wrist motion.
  
  
  METHODS
  Eighteen patients with surgically treated perilunate wrist dislocations (9 treated with intercarpal screws, 9 with intercarpal K-wires) were evaluated an average of 44 months after injury. The intercarpal screws were removed an average of 5 months and the K-wires an average of 3 months after the initial procedure. Complications included 3 pin track infections (1 with wrist sepsis), 2 scaphoid nonunions (screw fixation), and 2 patients with loss of reduction (K-wire fixation) treated with repeat surgery.
  
  
  RESULTS
  Four patients (2 in each cohort) had wrist arthrodesis with poor results. Among the 14 remaining patients the final flexion arc was 97 degrees for patients treated with screw fixation compared with 73 degrees for patients treated with K-wires. The mean grip strength was 74% (screw fixation) and 67% (K-wire) that of the uninjured arm. According to the Mayo Modified Wrist Score, the functional result was excellent in 1 patient (screw), good in 2 patients (1 each group), fair in 6 patients (3 in each group), and poor in 9 patients (4 screws, 5 K-wire). Seven patients (2 screws, 5 K-wires) had grade 2 or 3 midcarpal arthritis according to the criteria of Knirk and Jupiter, but none had more than mild radiocarpal arthritis.
  
  
  CONCLUSIONS
  The results of treatment with temporary screws are comparable to the results of treatment with temporary K-wires.
  
  
  METHODS
  Therapeutic III.
authors.affiliation: Hand and Upper Extremity Service, Massachusetts General Hospital, and Harvard Medical School, Boston, MA 02114, USA.
authors.forename: J Sebastiaan
authors.initials: JS
authors.lastname: Souer
authors.forename: Marijn
authors.initials: M
authors.lastname: Rutgers
authors.forename: Jonas
authors.initials: J
authors.lastname: Andermahr
authors.forename: Jesse B
authors.initials: JB
authors.lastname: Jupiter
authors.forename: David
authors.initials: D
authors.lastname: Ring
mesh_terms: D000328:Adult; D001863:Bone Screws; D001864:Bone Wires; D005260:Female; D005593:Fracture Fixation, Internal / Q000379:methods*; D050723:Fractures, Bone / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000601:surgery*; D008023:Ligaments, Articular / Q000502:physiology*; D012667:Lunate Bone / Q000000981:diagnostic imaging / Q000293:injuries*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014954:Wrist Injuries / Q000000981:diagnostic imaging / Q000601:surgery*