Research Article

Tendon versus Pyrocarbon Interpositional Arthroplasty in the Treatment of Trapeziometacarpal Osteoarthritis

Table 2

Clinical and radiologic outcomes at last follow-up.

VariablesGroup LGroup PP value∗
(n = 19)(n = 20)

VAS pain score0.7 (SD 1.0)0.8 (SD 1.0)0.757
Grip strength (kg)28.4 (SD 5.1)32.7 (SD 8.1)0.082
Pinch strength (kg)8.9 (SD 1.1)10.7 (SD 1.7)< 0.001
Kapanji score9.2 (SD 0.9)9.1 (SD 0.6)0.429
DASH score7.9 (SD 4.4)8.7 (SD 4.4)0.283
Proximal metacarpal migration (mm)1.4 (SD 0.2)1.9 (SD 0.2)0.883
Implant subluxation (n)
 Centered-17
 <1/4 displaced-3
 <1/2 displaced-0
 >1/2 displaced-0
Peri-prosthetic lucency
 <1 mm-19
 >1 mm-1

Continuous variables are reported as the mean (standard deviation). Group L = trapezium excision with ligament reconstruction and tendon interposition (LRTI); Group P = PyroDisk interpositional arthroplasty. ∗P values were computed from Student’s t-test or the Wilcoxon rank-sum test for continuous variables and Pearson’s chi-squared test or Fisher’s exact test for categorical variables. †P<0.05 VAS, visual analog scale; DASH, disabilities of arm, shoulder, and hand.