The effects of simulated unstable scaphoid fractures on carpal motion

D. K. Smith, W. P. Cooney, K. N. An, R. L. Linscheid, E. Y S Chao

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

The kinematics of five fresh frozen wrist specimens were studied before and after a simulated scaphoid waist fracture. To determine the change in wrist motion and fracture site characteristics associated with an unstable wrist, the relative motion of each carpal bone was determined from the movement of implanted carpal markers on biplanar radiographs obtained in neutral and the four extreme wrist positions. The kinematics of the wrist in our specimens before the osteotomy were similar to previous studies. After the osteotomy, the proximal and distal segments of the scaphoid moved independently. The distal scaphoid assumed a relatively flexed stance and displayed increased motion. The proximal scaphoid fragment and lunate assumed a relatively extended stance and displayed less motion after the osteotomy. These kinematic abnormalities produced significant interfragmentary motion that would be expected to complicate normal fracture healing. The spontaneous collapse of the two scaphoid fragments produced a dorsal angulation or "humpback" deformity that simulated the clinical situation of displaced scaphoid nonunions. The scaphoid serves an important role maintaining normal alignment of the carpal bones and producing normal wrist motion.

Original languageEnglish (US)
Pages (from-to)283-291
Number of pages9
JournalJournal of Hand Surgery
Volume14
Issue number2 PART 1
DOIs
StatePublished - 1989

Fingerprint

Wrist
Osteotomy
Biomechanical Phenomena
Carpal Bones
Fracture Healing

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

Cite this

Smith, D. K., Cooney, W. P., An, K. N., Linscheid, R. L., & Chao, E. Y. S. (1989). The effects of simulated unstable scaphoid fractures on carpal motion. Journal of Hand Surgery, 14(2 PART 1), 283-291. https://doi.org/10.1016/0363-5023(89)90022-1

The effects of simulated unstable scaphoid fractures on carpal motion. / Smith, D. K.; Cooney, W. P.; An, K. N.; Linscheid, R. L.; Chao, E. Y S.

In: Journal of Hand Surgery, Vol. 14, No. 2 PART 1, 1989, p. 283-291.

Research output: Contribution to journalArticle

Smith, DK, Cooney, WP, An, KN, Linscheid, RL & Chao, EYS 1989, 'The effects of simulated unstable scaphoid fractures on carpal motion', Journal of Hand Surgery, vol. 14, no. 2 PART 1, pp. 283-291. https://doi.org/10.1016/0363-5023(89)90022-1
Smith, D. K. ; Cooney, W. P. ; An, K. N. ; Linscheid, R. L. ; Chao, E. Y S. / The effects of simulated unstable scaphoid fractures on carpal motion. In: Journal of Hand Surgery. 1989 ; Vol. 14, No. 2 PART 1. pp. 283-291.
@article{8ef5d30f5aa54beb8d12b045086d6e74,
title = "The effects of simulated unstable scaphoid fractures on carpal motion",
abstract = "The kinematics of five fresh frozen wrist specimens were studied before and after a simulated scaphoid waist fracture. To determine the change in wrist motion and fracture site characteristics associated with an unstable wrist, the relative motion of each carpal bone was determined from the movement of implanted carpal markers on biplanar radiographs obtained in neutral and the four extreme wrist positions. The kinematics of the wrist in our specimens before the osteotomy were similar to previous studies. After the osteotomy, the proximal and distal segments of the scaphoid moved independently. The distal scaphoid assumed a relatively flexed stance and displayed increased motion. The proximal scaphoid fragment and lunate assumed a relatively extended stance and displayed less motion after the osteotomy. These kinematic abnormalities produced significant interfragmentary motion that would be expected to complicate normal fracture healing. The spontaneous collapse of the two scaphoid fragments produced a dorsal angulation or {"}humpback{"} deformity that simulated the clinical situation of displaced scaphoid nonunions. The scaphoid serves an important role maintaining normal alignment of the carpal bones and producing normal wrist motion.",
author = "Smith, {D. K.} and Cooney, {W. P.} and An, {K. N.} and Linscheid, {R. L.} and Chao, {E. Y S}",
year = "1989",
doi = "10.1016/0363-5023(89)90022-1",
language = "English (US)",
volume = "14",
pages = "283--291",
journal = "Journal of Hand Surgery",
issn = "0266-7681",
publisher = "W.B. Saunders Ltd",
number = "2 PART 1",

}

TY - JOUR

T1 - The effects of simulated unstable scaphoid fractures on carpal motion

AU - Smith, D. K.

AU - Cooney, W. P.

AU - An, K. N.

AU - Linscheid, R. L.

AU - Chao, E. Y S

PY - 1989

Y1 - 1989

N2 - The kinematics of five fresh frozen wrist specimens were studied before and after a simulated scaphoid waist fracture. To determine the change in wrist motion and fracture site characteristics associated with an unstable wrist, the relative motion of each carpal bone was determined from the movement of implanted carpal markers on biplanar radiographs obtained in neutral and the four extreme wrist positions. The kinematics of the wrist in our specimens before the osteotomy were similar to previous studies. After the osteotomy, the proximal and distal segments of the scaphoid moved independently. The distal scaphoid assumed a relatively flexed stance and displayed increased motion. The proximal scaphoid fragment and lunate assumed a relatively extended stance and displayed less motion after the osteotomy. These kinematic abnormalities produced significant interfragmentary motion that would be expected to complicate normal fracture healing. The spontaneous collapse of the two scaphoid fragments produced a dorsal angulation or "humpback" deformity that simulated the clinical situation of displaced scaphoid nonunions. The scaphoid serves an important role maintaining normal alignment of the carpal bones and producing normal wrist motion.

AB - The kinematics of five fresh frozen wrist specimens were studied before and after a simulated scaphoid waist fracture. To determine the change in wrist motion and fracture site characteristics associated with an unstable wrist, the relative motion of each carpal bone was determined from the movement of implanted carpal markers on biplanar radiographs obtained in neutral and the four extreme wrist positions. The kinematics of the wrist in our specimens before the osteotomy were similar to previous studies. After the osteotomy, the proximal and distal segments of the scaphoid moved independently. The distal scaphoid assumed a relatively flexed stance and displayed increased motion. The proximal scaphoid fragment and lunate assumed a relatively extended stance and displayed less motion after the osteotomy. These kinematic abnormalities produced significant interfragmentary motion that would be expected to complicate normal fracture healing. The spontaneous collapse of the two scaphoid fragments produced a dorsal angulation or "humpback" deformity that simulated the clinical situation of displaced scaphoid nonunions. The scaphoid serves an important role maintaining normal alignment of the carpal bones and producing normal wrist motion.

UR - http://www.scopus.com/inward/record.url?scp=0024522075&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024522075&partnerID=8YFLogxK

U2 - 10.1016/0363-5023(89)90022-1

DO - 10.1016/0363-5023(89)90022-1

M3 - Article

C2 - 2703676

AN - SCOPUS:0024522075

VL - 14

SP - 283

EP - 291

JO - Journal of Hand Surgery

JF - Journal of Hand Surgery

SN - 0266-7681

IS - 2 PART 1

ER -