Corbett Targeted Coin Test norms with thumb carpometacarpal osteoarthritis and outcomes post suture suspension arthroplasty.

Background: Carpometacarpal osteoarthritis is a common condition that leads to declines in hand dexterity. The Corbett Targeted Coin Test measures dexterity with palm-to-finger translation and proprioceptive target placement, but lacks established norms for the carpometacarpal osteoarthritis population and post carpometacarpal osteoarthritis suture suspension arthroplasty.

Purpose: To determine the Corbett Targeted Coin Test norms for patients with carpometacarpal osteoarthritis that are surgical candidates, as well as Corbett Targeted Coin Test norms and outcomes following carpometacarpal osteoarthritis suture suspension arthroplasty.

Study design: Clinical measurement of a retrospective cohort.

Methods: Subjects were diagnosed with carpometacarpal osteoarthritis, had carpometacarpal suture suspension arthroplasty, and were assessed preoperatively and 12 weeks postoperatively.

Results: Prior to surgery, the patients with carpometacarpal osteoarthritis that were surgical candidates demonstrated a mean Corbett Targeted Coin Test quality of performance score of 53.4 (range 28-90). A total of 31 participants (22 females, nine males) underwent thumb carpometacarpal suture suspension arthroplasty. On average, there were 7.1 therapy visits (range 4-10) and the average age was 66.6years (51-81years). Outcome measures following suture suspension arthroplasty 12weeks postoperatively demonstrated both statistically and clinically significant improvements in pain reduction (Numeric Pain Rating Scale), QuickDASH scores, and Patient-Rated Wrist/Hand Evaluation scores. There was also a clinically significant improvement in grip strength. Corbett Targeted Coin Test scores improved with a mean quality of performance score of 47.3 (range 20-73) but did not correlate with other outcome measures.

Conclusions: Patients with carpometacarpal osteoarthritis had higher quality of performance scores, indicating a slower and/or less accurate dexterity performance compared with the normal population. At 12weeks post suture suspension arthroplasty, the Corbett Targeted Coin Test scores improved 11.4%, and there were statistically and clinically significant improvements in pain reduction (Numeric Pain Rating Scale), QuickDASH, Patient-Rated Wrist/Hand Evaluation, and a clinically significant improvement in grip strength.