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Table 1 Design parameters of proposed proximal interphalangeal joint (PIPJ) implant

From: Novel implant design of the proximal interphalangeal joint using an optimized rolling contact joint mechanism

  Length of long axis (proximal phalanx, middle phalanx) (mm) Dorso-volar diameter (proximal phalangeal head, middle phalangeal base) (mm) rp (mm) r m
(mm)
r pe
(mm)
r me
(mm)
Components of position vector:  ppp = (xp, yp) Components of position vector: ppm = (xm, ym) Components of position vector:  pppe = (xpe, ype) Components of position vector:  ppme = (xme, yme) Offset angle: ϕ (°)
Participant 1 (51.61, 28.82) (8.94, 11.25) 12.77 5.00 2.00 2.00 (− 11.58, 1.87) (6.11, 3.45) (− 0.86, 2.83) (3.13, 3.18) − 5.09
Participant 2 (46.98, 28.49) (9.25, 12.17) 12.85 5.00 2.00 2.00 (− 11.95, 0.31) (5.48, 4.18) (− 1.36, 2.66) (2.55, 3.53) − 12.51
Participant 3 (50.73, 30.22) (8.89, 11.57) 13.27 5.00 2.00 2.00 (− 11.63, 2.02) (6.61, 3.04) (− 0.38, 2.65) (3.62, 2.87) − 3.21
Participant 4 (34.04, 18.93) (6.17, 7.70) 8.25 5.00 2.87 2.30 (− 7.39, 1.83) (5.77, 3.34) (− 2.05, 2.44) (3.10, 3.03) − 6.54
Participant 5 (41.46, 24.03) (7.27, 8.99) 10.78 5.00 2.11 2.00 (− 9.78, 1.28) (5.81, 3.76) (− 1.21, 2.65) (2.84, 3.29) − 9.05
Participant 6 (40.89, 23.84) (7.77, 9.37) 12.05 5.00 2.00 2.00 (− 10.49, 2.71) (6.56, 2.89) (− 0.44, 2.81) (3.56, 2.85) − 0.58
Participant 7 (42.07, 24.32) (7.30, 8.98) 10.11 5.00 2.38 2.00 (− 9.21, 0.98) (5.62, 3.89) (− 1.62, 2.47) (2.68, 3.31) − 11.13
Participant 8 (45.67, 27.12) (8.76, 10.00) 12.46 5.00 2.00 2.00 (− 10.83, 2.15) (6.62, 2.94) (− 0.38, 2.62) (3.62, 2.80) − 2.56
Participant 9 (38.31, 22.51) (7.52, 8.44) 11.24 5.00 2.00 2.00 (− 10.04, 1.10) (5.99, 3.67) (− 0.92, 2.56) (3.03, 3.20) − 9.10
Participant 10 (41.57, 22.26) (7.85, 9.44) 11.08 5.00 2.10 2.00 (− 10.19, 1.15) (5.66, 3.87) (− 1.34, 2.67) (2.70, 3.36) − 9.75
  1. rp radii of rolling surface of the heads of proximal phalangeal component, rm radii of rolling surface of the heads of middle phalangeal component, rpe radii of circular surface located at the dorsal part of proximal phalangeal component head, rme radii of circular surface located at the dorsal part of middle phalangeal component head