Hi all,

I have been trying to find information about the mechanical
properties of tendon in compression but thus far have been
unsuccessful. There is a lot information on tension but
nothing on compression. I have tried searching the normal
databases and the list archives. Does anyone know of any
literature that has defined the mechanical properties of
tendon in compression?

The reason I ask this question is that I am interested in
trying to measure the forces/pressure caused by the fixation
of hamstring grafts against the bone tunnel wall during ACL
reconstruction. Interference screws are a widely used form
of fixation device particularly in the tibia as the bone
mineral density is reduced compared to the distal femur.
Normally the tendon graft is sized and then a bone tunnel
the same diameter as the graft is drilled then the tendon is
inserted into the bone tunnel and then an interference screw
the same size as the tunnel is inserted in to the tunnel.
As I am sure you can imagine this is a pretty tight fit.
Depending on the particular surgeons preference the screw
can range from +1mm to -2mm compared to the graft size.
However we have no idea of the forces/pressure that these
fixation devices apply to the tendon and bone tunnel wall,
how the force/pressure is affected by varying the diameter
of the interference screw or how changing the
forces/pressure affects the healing/ingrowth of the tendon
and bone.

Any information you could provide would be welcomed and
appreciated. I will post a summary once all replies are

Have a merry christmas and a happy and safe new year.

Mark Watts BScAppHMS(Ex-Sc) Hons, MPhil, PhD Candidate

Room 706 O Block
Gardens Point Campus
School of Engineering Systems
Queensland University of Technology
GPO Box 2434
QLD 4001

Phone: +61 7 3864 9043
Fax: +61 7 3864 1037
Mobile: +61 0411 665 198
Email: mc.watts@qut.edu.au