Article

Posttraumatic joint contracture is a common complication of
intraarticular injuries and an associated traumatic hemarthrosis could be of
importance for its development. The purpose of this investigation was to
determine whether the source of the hemarthrosis (peripheral blood vs. bleeding
from the bone marrow) affects the amount of contracture and its reversibility and
biomechanical properties. METHODS: 46 New Zealand White rabbits were divided in 6
groups and 33 underwent 8 weeks immobilization with either hemarthrosis from bone
marrow or peripheral blood. 16 rabbits underwent remobilization for another 8
weeks. 7 animals had only hemarthrosis (bone marrow) for 8 weeks, while 6 were
used as controls. Analysis included mean contracture angle and biomechanical
variables. FINDINGS: The immobilized animals had an increased contracture angle,
the knee angle vs. force curve had a greater hysteresis and showed higher initial
stiffness. There was no difference in biomechanical properties of the knee
between the different types of hemarthroses. After 8 weeks remobilization most
biomechanical properties were not different from control. INTERPRETATION: The
origin of hemarthrosis, and therewith the presence of marrow-derived factors and
pluripotential cells from bone marrow, does not seem to affect the severity of
joint contractures nor their reversibility.
CI - Copyright (c) 2011 Elsevier Ltd. All rights reserved.

Langue : ANGLAIS