Selected outcomes of thumb replantation after isolated thumb amputation injury.
OBJECTIVE
The aim of this study was to assess thumb survival, pinch strength, grip strength, and need for secondary surgery in patients undergoing thumb replantation after isolated thumb amputation injury.


METHODS
We conducted a retrospective review of 52 consecutive isolated thumb replantations performed over a 4.5-year period. Charts were reviewed for mechanism of injury, level of amputation, and surgical technique. Primary outcomes of interest included survival and secondary surgery (eg, tenolysis, neurolysis) rates. Functional outcome was assessed by pinch and grip strengths after a mean follow-up period of 10 months from the initial injury.


RESULTS
The overall thumb survival rate was 92% (48 of 52). One hundred percent of Zone I injuries (13 of 13), 94% of zone II injuries (29 of 31), and 75% of zone III injuries (6 of 8) survived; overall survival was 94% in sharp injuries (32 of 34), 89% in avulsion injuries (8 of 9), and 89% in crush injuries (8 of 9). Secondary surgery was performed in 18 patients with increasing need across the 3 zones (0%, 42%, and 63%, respectively; p for trend = .002). Pinch and grip strengths of 17 patients after an average follow-up period of 10 months were significantly worse after crush/avulsion injuries (p = .007 and .07, respectively) and injuries requiring joint intervention (p = .004 and .02, respectively); grip strength was also found to be negatively associated with increasing zone of injury.


CONCLUSIONS
This retrospective study shows that a high rate of survival can be achieved after thumb replantation using current techniques. In addition, the need for secondary surgery is strongly related to zone of injury, with zone I injuries requiring the least amount of secondary surgery. Finally, pinch and grip strengths may be worse after crush or avulsion injuries and injuries requiring joint intervention.


METHODS
Therapeutic IV.
Agarwal
Jayant P
JP
Department of Surgery, University of Utah, Salt Lake City, UT, USA. jay.agarwal@hsc.utah.edu
Trovato
Matthew J
MJ
Agarwal
Shailesh
S
Hopkins
Paul N
PN
Brooks
Darrell
D
Buncke
Greg
G
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000673:Amputation, Traumatic / Q000601:surgery*; D015331:Cohort Studies; D005260:Female; D005383:Finger Injuries / Q000175:diagnosis / Q000601:surgery; D005500:Follow-Up Studies; D006085:Graft Survival; D018737:Hand Strength; D006801:Humans; D008297:Male; D008875:Middle Aged; D052581:Pinch Strength; D011183:Postoperative Complications / Q000601:surgery; D020127:Recovery of Function; D012086:Reoperation / Q000379:methods; D012092:Replantation / Q000379:methods*; D012189:Retrospective Studies; D013933:Thumb / Q000293:injuries* / Q000601:surgery; D016896:Treatment Outcome; D055815:Young Adult