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Table 3 Comparison between RA hands with different ultrasonographic findings and RA hands with normal hand ultrasound as regards hand grip strength. Cut-off values for MSUS findings to be present: grade 1 synovitis (grade 1 SH and ≤ grade 1 PD signal) or more of any of the mentioned joints, grade 1 or more tenosynovitis of any of the mentioned tendons

From: Value of musculoskeletal ultrasound in assessment of rheumatoid hand function

  Grip strength (mmHg)  
Absent Present
Mean SD Mean SD p value
Ulnar 4 PIP joints synovitis 186.3 50.7 177.8 43.4 0.524
MCP joints of ulnar 4 fingers synovitis 195.0 48.4 170.2 45.1 0.045
Wrist joint synovitis 196.4 45.1 164.0 46.9 0.009
Flexor tendons tenosynovitis of the ulnar 4 fingers 191.0 47.8 145.5 29.2 0.001
Extensor tendons tenosynovitis of the ulnar 4 fingers 184.1 45.8 180.0 61.3 0.808
Tenosynovitis of EPL, EPB, APL, and FPL 190.4 49.5 148.5 14.7 0.000
FPL tendon tenosynovitis 185.1 48.8 151.7 12.6 0.013
FCU, ECU, FCR, ECRL, and ECRB tendons tenosynovitis 184.5 47.8 180.0 51.1 0.765
  1. Bold, < 0.05
  2. SD standard deviation, mmHg millimeter mercury, P level of significance, MCP metacarpophalangeal, MCPJs metacarpophalangeal joints, PIPJs proximal interphalangeal joints, APL abductor pollicis longus, EPL extensor pollicis longus, EPB extensor pollicis brevis, FPL flexor pollicis longus, FCU flexor carpi ulnaris, ECU extensor carpi ulnaris, FCR flexor carpi radialis, ECRL extensor carpi radialis longus, ECRB extensor carpi radialis brevis