Abstract
Background The general assessment of basal joint arthritis (BJA) is limited using the Disabilities
of the Arm, Shoulder, and Hand (DASH) questionnaire. This has been shown to be insensitive
to pain and disability levels, leading to the development and validation of the thumb
disability examination (TDX) as a specific tool for BJA in 2014.
Objective The goal of this study was to evaluate the reliability, sensitivity, and specificity
of the TDX score for BJA.
Methods A multicenter BJA database was established in 2007 to collect prospective data. We
evaluated the correlation between the TDX score, visual analog pain scale with activity
(A-VAS), Eaton–Littler score, and grip strength using a Pearson test. Additionally,
we evaluated the pre- and postintervention scores to assess their predictive values.
Results A total of 109 thumbs of 74 patients with TDX scores were evaluated. Females were
more commonly affected (75.2%), and the mean age was 65.39 years (standard deviation:
10.04). The majority of participants were white (90.8%). A high correlation between
TDX and A-VAS score (Pearson's correlation = 0.520; p < 0.001) and between grip strength (Pearson's correlation = –0.336; p < 0.005) and Eaton–Littler score (Pearson's correlation = 0.353' p < 0.01) was identified. Additionally, when comparing pre- and post-intervention for
all treatment groups and for operative intervention, significant differences in TDX
scores were observed (both p ≤ 0.01). No significant differences could be identified for DASH score or A-VAS when
assessing these same groups.
Conclusion The TDX score correlates to high Pearson's correlation values and p-values, especially in grip strength, Eaton–Littler score, A-VAS score, and pre-/postintervention
for all treatment groups combined and when specifically assessing the surgical intervention
group. As a result, it can be concluded that the TDX score is a specific tool for
the assessment of BJA.
Level of Evidence This is a Level II, prospective comparative study.
Keywords
functional outcome - basal joint - arthritis - thumb - outcome
