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Table 4 Differences in patients with isolated carpometacarpal osteoarthritis versus patients with osteoarthritis also in other finger joints

From: Non-pharmacological treatment gap preceding surgical consultation in thumb carpometacarpal osteoarthritis - a cross-sectional study

  Isolated CMCJ OA
(n = 117)
CMCJ plus IPJ OA
(n = 63)
P value*
Body structure
 Radiographic CMCJ OA severity (0–4, 0 = no CMCJ OA), median (IQR) 3 (3,4) 3 (3,4) .82
 Presence of clinical CMCJ subluxation, n (%) 79 (73) 34 (59) .08
 Radiographic CMCJ subluxation ratio, mean (SD) 0.50 (0.09) 0.48 (0.11) .14
 Number of finger joints with clinical nodes (0–9 joints), median (IQR) 0 (0,0) 3 (2,4) <.001
Body function
 Pain at rest (0–10, 0 = no pain), median (IQR) 3 (1,4) 4 (2,5) .05
 Pain following measure of grip strength (0–10, 0 = no pain), median (IQR) 3 (1,5) 4 (2,5) .41
 Pain following measure of pinch strength (0–10, 0 = no pain), median (IQR) 4 (1,6) 4 (2,5) .87
 Max grip strength, Newton (N), median (IQR) 176 (112,274) 152 (101,196) .03
 Max pinch strength, N, median (IQR) 31 (22,43) 27 (19,34) .02
 Grip strength referred hand (% of normal grip strength), mean (SD) 66 (26) 61 (23) .23
 Pinch strength referred hand (% of normal pinch strength), mean SD 63 (26) 57 (22) .12
 Number of painful finger joints (MCPJ, IP, PIPJ, DIPJ: 0–14 joints), median (IQR) 1 (0,3) 5 (3,7) <.001
 Flexion deficit 2nd-5th fingers, mm, median (IQR) 0 (0,0) 0 (0,41) <.001
 Range of motion thumb IP, degrees, median (IQR) 71 (64,80) 65 (55,75) .02
 Range of motion MCP1, degrees, median (IQR) 50 (41,60) 49 (42,55) .56
 Palmar abduction thumb, degrees, median (IQR) 49 (42,58) 46 (39,51) .01
 Abduction CMCJ, degrees, median (IQR) 37 (32,44) 35 (29,40) .02
Activity and participation
 Activity performance (1–4, 1 = no activity problems), mean (SD) 1.9 (0.4) 2.1 (0.4) <.001
 Function and symptoms arm, shoulder and hand (0–100, 0 = no disability), mean (SD) 34.3 (15.7) 41.6 (17.0) .01
  1. Numbers are reported as median and interquartile range (IQR), number and proportion (%), or mean and standard deviation (SD). Radiographic CMCJ OA severity is classified using modified Kellgren-Lawrence scale (grade 0–4, 0 = no CMCJ OA). Pain is self-reported using Numeric Rating Scales (NRS 0–10, 0 = no pain). Grip and pinch strength is measured in Newton (N) using the Grippit electronic instrument. Flexion deficit is measured in millimetres (mm). Range of motions is measured in degrees with goniometer. Palmar abduction thumb and CMCJ abduction is measured in degrees using the Pollexograph®. Activity performance is measured with mean score of MAP-Hand (1–4, 1 = no activity problems). Function and symptoms arm, shoulder and hand is measured using sum score of QuickDASH (0–100, 0 = no disability)
  2. *Values for body structure and body function variables are values for referred hand in patients referred for one hand, and mean of both hands in patients referred for both hands. Differences between OA affection in isolated CMCJ and OA affection in CMCJ plus in IPJ are analysed with Paired-samples t-test if normally distributed, Wilcoxon Signed Rank test if skewed, or Chi-Square test if categorical, and reported with p-values
  3. NRS Numeric Rating Scale, MCPJ metacarpophalangeal joints, IP thumb interphalangeal joint, PIPJ proximal interphalangeal joints, DIPJ distal interphalangeal joints, MCP1 thumb metacarpophalangeal joint