Long, strong kangaroo tendon could soon be transplanted* into injured human knees, ankles and shoulders if trials by the University of Sydney are a success.
Tendons are strong, flexible, non-stretchy parts of the body that attach muscles to bones.
Tests have already shown that kangaroo tendon is six times stronger than human cruciate ligament, so they could be used in place of torn ligaments in human joints. Ligaments are tough bands that connect bone to bone. Cruciate ligaments are a pair of ligaments that cross the knee joint to connect the thigh (femur) bone to the shin (tibia) bone.
Over the next three years, Australian surgeon* Dr Nick Hartnell and researchers at the University of Sydney will test kangaroo tendons for transplanting into human joints. Dr Hartnell is an orthopaedic surgeon, which means he repairs problems with bones, muscles and joints.
The other part of the trial is to test 3D-printed screws, to attach the kangaroo tendon to the bone.
Success in the trials will help solve a big problem around the world. Just in Australia, there are 15,000 knee reconstructions* every year to repair the anterior (front) cruciate ligament, often called the ACL. Just this weekend, Sydney Swans AFL player Alex Johnson injured his ACL in only his second game since the 2012 AFL Grand Final. He has already had five reconstructions and several other repair operations on his left knee.
Success could also make the companies who are paying for the trials a lot of money. Ligament and tendon repair work around the world is worth about $10 billion every year. The companies are Allegra Orthopaedics, Bone Ligament Tendon (BLT) Pty Ltd and the Innovative Manufacturing CRC Limited (IMCRC).
The materials and techniques* used now to repair ligament injuries are not working perfectly.
“Materials used in ligament reconstructions come from three sources: humans, pigs, and synthetic* constructs, and each has drawbacks*,” said Dr Elizabeth Clarke, who leads the kangaroo tendon-testing project with Professor Christopher Little, both of the University of Sydney.
Man-made material breaks easily. Material transplanted from another part of the injured person’s body, such as the hamstring at the back of the thigh, needs a second wound to take a piece of the hamstring, which means recovery can take a long time. And ligaments taken from pigs are only 3cm long, which is not long enough for human joints.
“Kangaroo tendon has a similar composition* to humans but is longer and has better mechanical* properties*, which makes it an exciting natural product that could be used in a range of surgical procedures*,” said Dr Hartnell.
Kangaroo tendons used in the project will be taken from the tails and Achilles tendons thrown out as waste when kangaroos are harvested for meat. The Achilles tendon runs from the heel to the lower leg. On your own leg, it feels like a piece of thick rope at the back of your ankle.
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GLOSSARY
transplanted: taken from somewhere else and put somewhere new
surgeon: doctor who operates
reconstructions: build again
techniques: ways of doing things
synthetic: man-made, not made by nature
drawbacks: downsides
composition: what it is made from and its structure
mechanical: how something moves
properties: its features, such as whether it is heavy or light, soft or hard, liquid or solid
surgical procedures: operations
LISTEN TO TODAY’S STORY
QUICK QUIZ
1. How much stronger is kangaroo tendon than human cruciate ligament?
2. What does an orthopaedic surgeon do?
3. What will the other part of the trial test?
4. What three sources are there now for repairing these type of injuries?
5. Where is the Achilles tendon?
CLASSROOM ACTIVITY
1. Be a news reporter
Imagine that you are a reporter for Kids News. Your job is to interview Swans player Alex Johnson about the chance that kangaroo tendon could be used to help people like him with ligament injuries. Write four questions. Then write the answers that you think he would give.
Time: Allow 25 minutes
Curriculum Links: Health and Physical Education, English
2. Extension: Some people believe that it is not ethical (that is, not the right thing to do) to use animals for medical treatments or testing. What do you think? Write a list of ideas and arguments for and against the use of animals for medical treatments or testing.
Time: Allow 25 minutes
Curriculum Links: Ethical Capability
VCOP ACTIVITY
After reading the article, with a partner, highlight as many pieces of punctuation as you can find in green. Discuss how these are being used, where and how often. What level of the punctuation pyramid is the journalist using in this article?
HAVE YOUR SAY: Which part of the story would you like to know more about? What question would you like to ask the researchers about the trials or how these type of injuries are repaired now?
Use full sentences. No one-word answers.
