Objective insight into the strength of your knee
An isokinetic strength test of the knee provides accurate insight into the strength of the thigh muscles. At Fysioplein we use the Cybex, an advanced measuring system that objectively measures the strength of the quadriceps (thigh muscle) and hamstrings.
With this test, we accurately map strength differences between both legs, muscle weakness, and recovery following an injury or surgery. The results help in developing or adjusting a treatment plan and provide insight into the progress of rehabilitation. Additionally, the test can play an important role in determining whether a safe return to sport or work is possible.
When is an isokinetic strength test useful?
An isokinetic strength test of the knee can be used for, among other things:
- Rehabilitation after anterior cruciate ligament (ACL) surgery
- Rehabilitation after a posterior cruciate ligament injury
- Meniscus surgeries
- Knee replacement
- Patellar tendon complaints (jumper's knee)
- Quadriceps or hamstring injuries
- Chronic knee complaints in which muscle strength plays a role
- Monitoring recovery after a knee injury or surgery
- Assessment of a safe return to sport
What is being measured?
During the isokinetic strength test, the strength of the quadriceps (thigh muscles at the front of the knee) and hamstrings (back of the knee) is accurately mapped using the Cybex.
The knee is tested at three different speeds. This provides us with insight into various aspects of muscle function:
- Maximum force: how much force the quadriceps and hamstrings can generate maximally.
- Explosive power: how quickly the muscles can develop force, for example important for jumping, sprinting, and turning.
- Stamina: how well the muscles can sustain an effort.
In addition, we assess, among other things:
- The difference in strength between the left and right leg.
- The ratio between hamstring and quadriceps strength (H/Q ratio).
- Whether there is still a deficit in strength or muscle function during recovery.
The results provide an objective picture of the load-bearing capacity of the knee and help determine the appropriate next steps in rehabilitation or return to sport.
How does the test work?
An appointment for an isokinetic strength test takes approximately 30 minutes.
During the appointment:
- You will receive an explanation about the test.
- Is the Cybex accurately adjusted to your body measurements?
- Perform three exercise movements to familiarize yourself with the device.
- The strength of the quadriceps and hamstrings is measured at different test speeds.
- The physiotherapist discusses the results with you immediately.
Haven't had knee surgery?
Have you not had knee surgery? Then we will first schedule an intake with one of our physiotherapists. During this intake, we will assess your symptoms and determine whether an isokinetic strength test is the most suitable diagnostic method. If the test is indicated, we will schedule a separate appointment for this.
Why choose an isokinetic strength test?
A standard force assessment or manual force measurement often provides insufficient information to properly evaluate the recovery of the knee. The Cybex measures muscle force very accurately throughout the full range of motion of the knee, making even smaller differences in force visible.
Benefits of the test:
- Objective and reliable measurement
- Very accurate analysis of muscle strength
- Comparison between both legs
- Insight into the progress of rehabilitation
- Support with the decision to safely return to sport or work
- Possibility to make targeted adjustments to the treatment plan
Who is this test suitable for?
The isokinetic strength test is suitable for anyone who wants to obtain an objective picture of the strength and function of the knee. The test is regularly used during rehabilitation following knee surgery or a knee injury, but can also be valuable for long-term knee complaints or to evaluate the progress of a treatment.
The test is suitable for:
- People recovering from knee surgery.
- People with long-term or recurring knee complaints.
- Athletes who want to determine whether they can safely return to their sport.
- Anyone who wants to have the muscle strength of the knee measured objectively.
Frequently asked questions
Is the test painful?
No. The test requires maximum effort from the thigh muscles, but normally causes no pain. However, temporary muscle fatigue may occur.
How long does the appointment take?
The appointment for the isokinetic strength test takes approximately 30 minutes.
Will I get the results immediately?
Yes. Afterwards, the physiotherapist will immediately discuss the results with you and explain the meaning of the measurements. If desired, a report can be provided or forwarded.
Do I need a referral?
No. A referral from a general practitioner or medical specialist is not required for an intake or an isokinetic strength test.
Make an appointment
Do you want to know how strong your knee actually is, or would you like an objective assessment to determine if you are ready to return to sports or work? Then please contact Fysioplein for an intake or an isokinetic strength test of the knee.
Our physiotherapists would be happy to assess which step best suits your recovery.
