Product description

Isokinetic multijoint module for testing and training the major joints.

With the control module PM and a wide range of adapters which are needed for the scheduled tasks, the CON-TREX® MJ isokinetic multijoint module is a versatile, rotatory testing, training and therapeutic system to test and train all major joints of the upper and lower limbs in the open kinetic chain. The highly flexible mechanism with excellent operator guidance makes objective and reproducible test results possible in every work mode. The mechanical design of the CON-TREX® MJ is extremely user-friendly: the position of the seat, the seat length, and the inclination of the backrest can be electronically adjusted at the touch of a button. The upholstered seat and backrest offer a maximum of comfortable seating even during long training sessions and are easy to clean.
Training while sitting or standing, measurements in the prone or supine position: CON-TREX® MJ offers maximum flexibility in every case. It enables the analysis of both the static and dynamic strength of a joint and the resulting targeted functional muscle strength training and improvement to skills of coordination with possible monitoring and correction during training or therapy.
Thanks to its flexible system, the CON-TREX® MJ allows adjustment close to the joints with maximum stability. The adapters are perfectly adjustable to the anatomical situation of the subject. Isolated joint tests, as well as free movements, are possible with a wide range of accessories.


Human kinetics software

The human kinetics software allows easy separation of databases, thereby enabling different internal departments or scientific areas within the same facility to work independently. The presentation of the numerous report designs can be customised. Export to other data processing programs is done easily via the ASCII interface. Anonymisation of the data for scientific work is easily possible.
The detailed online help provides direct notes on the current menu item or the operation being performed, with images and graphics. Above all, the detailed information on the numerous movement performances clarifies both the positioning of the subject / patient and the use of the required adapters.

Ballistic mode

An innovative, ballistic control behavior allows achieving higher accelerations and thus faster movement by pre-calculation of the movement to be expected. This results in a significant reduction of the influence of the moments of inertia. In ballistic mode, higher speeds of movement or a defined speed for longer times, respectively, can be carried out isokinetically. The ballistic mode optimizes training and testing with functional and realistic movements and loads.


Active compensation of gravity


Patients with little strength are often unable to move individual segments of their bodies without assistance. This means that active compensation for these static weight influences is required over the entire motion amplitude. While the movement is being performed, the dynamometer can continuously reduce the external forces or even compensate for them completely; this produces a „gravity-free“’ situation for the patient where every movement can be performed with minimal expenditure of force.




Highest precision

The exceedingly high sampling rate of 4000 Hz ensures extremely precise control of the dynamometer and reduces unwanted jitter (temporal frequency deviation in the control system) to a minimum below the perception threshold. Thanks to the play-free drive train, no play can be felt during movement reversal, which is particularly relevant for highly dynamic movements (such as throwing). This also allows the practice of unique movement sequences such as a combination of continuous-passive movement (CPM) with concentric or eccentric loading.


EMG (Electromyography)

EMG (Electromyography)The constant offset of 12 milliseconds at full sampling rate (4000 Hz) allows precise, easy and reliable synchronization of the signals.





Three-level safety concept

Three-level safety conceptThe continuously adjustable mechanical movement stops limit the range of movement directly at the dynamometer. In addition, the position of the movement stops is tracked by the system and constantly matched against the selected movement pattern. Thus, the software redundantly prevents exceedance of the movement amplitude.

Alignment and adjustment

Alignment and adjustmentIn CON-TREX® systems, the dynamometer is moved to the patient. The flexible dynamometer head allows precise and very close adjustment of the rotary axis of the dynamometer in relation to the joint axis.



AdapterThe products of the wide adapter range are made of high-strength stainless steel, combining maximum torsional stiffness with the lowest possible mass moment of inertia. Adjustment is continuous and time-saving thanks to a sophisticated and reliable clamping mechanism.




ReportsIndividually customizable reports with a variety of presentation options and diagrams, and function for export as a PDF document. The export of the measurement data as an ASCII file allows further processing in other programs.






Therapy information

CON-TREX® can be used in early diagnostic and preventative therapy for injuries to the musculoskeletal system in out-patient rehabilitation and in the clinic. It is also used in scientific research and performance optimization and facilitates the careful and specific analysis of problems and thus the highly efficient training of top athletes.

CON-TREX® machines are suited to measurement and analysis thanks to the high levels of precision and are thus especially well-suited to scientific use. In training and therapy, they aim to improve muscle capabilities (in both the strength and stamina areas) as well as sensorimotor skills.  Thanks to its versatile measuring capabilities and the intuitive exercise software, CON-TREX® is excellently suited to the following applications:

Orthopedic rehabilitation and traumatology:
CON-TREX® enables the early diagnosis and prevention of damages or injuries to the musculoskeletal system in out-patient rehabilitation and in clinical use.

Diagnosis and rehabilitation of musculoskeletal deficiencies
Muscular disbalances can disrupt the ideal sequence of movements and may have damaging effects on the joints or, depending on the type of sport, can even be desirable or required. CON-TREX® helps to record, detect and analyze these disbalances. In addition, CON-TREX® machines can be used to efficiently eliminate muscular disbalances. One particular benefit is in the fact that the tested movement can be trained at the same time.

Joint replacement
CON-TREX® machines can be used in the area of geriatric rehabilitation after artificial joint replacement in particular. Even at very low available muscular strength patients can actively train and improve their muscularity at a sensible speed of motion. This means that the loss of strength is kept to a minimum and the mobility of the joints either remains the same or is improved.

Neurological rehabilitation:

When performance is diminished for neurological reasons, for example, after a brain injury or a stroke, rehabilitation work focuses on restoring coordination and control of the work done by the muscles. The German Society for Neurology demands the early functional mobilization of patients who are after having suffered a stroke. CON-TREX® is suited to this task thanks to its exercise and training function in a continuous passive motion mode: The affected patient’s limb is moved by CON-TREX® while the patient can simultaneously attempt to autonomously control and move the limb. CON-TREX® simultaneously visualizes the ongoing performance of the patient, that is, training can be followed in real-time on the monitor and even the smallest of advances is immediately reproduced on the screen. This adds to the patient’s motivation to increase the effectiveness of the rehabilitation through their active cooperation. This can only be achieved to a limited extent using “classic” training methods. Bio-feedback training, especially with a submaximal load, not only enables efficient correction of muscular deficiencies but is also an excellent method of improving coordination abilities.

Optimised performance in competitive sports:
CON-TREX® machines are used in competitive sport, most of all when it comes to objectively evaluate physique and optimizing the progression of training of competitive and top-level athletes. Various strength tests which can be carried out at regular intervals provide both trainers and athletes with precise feedback on the effectiveness of their training methods. Within the framework of motion analyses for the optimization of motion sequences specific to particular sports, precise problem analyses can also be generated using combined EMG evaluations. When rehabilitating top athletes after injuries, CON-TREX® machines facilitate highly efficient training sessions and contribute towards the sensible use of the injury period.

Science and research:
Thanks to the high levels of precision of CON-TREX® machines, the objective evaluation of every patient at the highest validity rates possible is given. CON-TREX® archives all relevant system parameters which could be of importance to scientific evaluation. In addition, the unique ballistic mode ensures the smooth execution of both motion sequence and measurement. This active gravity compensation facilitates both absolute and relative observation of the values. When used in science and research, the CON-TREX® machines set previously unequaled high standards in regard to the accuracy of measurement and reproducibility of the collected parameters.

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CON-TREX® – reliability and validity

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Cotte T., Ferret J.M. (2003): Comparative study of two isokinetic dynamometers: CYBEX NORM vs. CON-TREX® MJ. IOS Press Isokinetics and Exercise Science 11(1), 37-43.

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Maffiuletti N.A., Bizzini M., Desbrosses K., Babault N., Munziner U. (2007): Reliability of knee extension and flexion measurements using the Con-Trex isokinetic dynamometer. Clin Physiol Funct Imaging 27, 346-353.

Müller S., Baur H., König T., Hirschmüller A., Mayer F. (2007): Reproducibility of isokinetic single- and multi-joint strength measurements in healthy and injured athletes. Isokinetics and Exercise Science 15, 295-302.

Müller S., Mayer P., Baur H., Mayer F. (2011): Higher velocities in isokinetic dynamometry: A pilot study of new test mode with active compensation of inertia. IOS Press, Isokinetics and Exercise Science 19, 63–70 63, DOI 10.3233/IES20110398.

Müller S., Stoll J., Müller J., Mayer F. (2012): Validity of isokinetic trunk measurements with respect to healthy adults, athletes and low back pain patients. Isokinet Exerc Sci 20, 255–66. doi:10.3233/IES-2012-00482.

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CON-TREX® – clinical and scientific application

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Baray A.L., Philippot R., Neri T., Farizon F., Edouard P. (2016): The Hemi-Castaing ligamentoplasty for chronic lateral ankle instability does not modify proprioceptive, muscular and posturographic parameters. 24(4), 1108-15. doi:10.1007/s00167-015-3793-3.

Baur H., Müller S., Hirschmüller A., Huber G., Mayer F. (2006): Reactivity, stability and strength performance capacity in motor sports. Br J Sports Med 40, 906-911.

Baur H., Müller S., Pilz F., Mayer P., Mayer F. (2010): Trunk extensor and flexor strength of long-distance race car drivers and physically active controls. J Sports Sci 28: 1183–1187.

Edouard P., Castells J., Calmels P., Roche F., Degache F. (2010): Cardiovascular and metabolic responses during isokinetic shoulder rotators strength testing in healthy subjects. ISSN 0959-3020/10 Isokinetics and Exercise Science 18, 23–29 23. doi:10.3233/IES-2010-0363 IOS Press 23-29.

Edouard P., Bankolé C., Calmels P., Beguin L., Degache F. (2013): Isokinetic rotator muscles fatigue in glenohumeral joint instability before and after Latarjet surgery: a pilot prospective study. Scand J Med Sci Sports 23(2), 74-80. doi:10.1111/sms.12011. Epub 2012 Nov 1.

Edouard P., Degache F., Oullion R., Plessis J.Y., Gleizes-Cervera S., Calmels P. (2013): Shoulder strength imbalances as injury risk in handball. Int J Sports Med 34(7), 654-60. doi:10.1055/s-0032-1312587. Epub 2013 Feb 26.

Francis P., Toomey C., Mc Cormack W., Lyons M., Jakeman P. (2016): Measurement of maximal isometric torque and muscle quality of the knee extensors and flexors in healthy 50- to 70-year-old women. Clin Physiol Funct Imaging 28, n/a–n/a. doi:10.1111/cpf.12332.

Hirschmüller A., Konstantinidis L., Baur H., Müller S., Mehlhorn A., Kontermann J., Grosse U., Südkamp N.P., Helwig P. (2011): Do changes in dynamic plantar pressure distribution, strength capacity and postural control after intra-articular calcaneal fracture correlate with clinical and radiological outcome? Injury 42, 1135–43. doi:10.1016/j.injury.2010.09.040.

Hirschmüller A., Andres T., Schoch W., Baur H., Konstantinidis L., Südkamp N.P., Niemeyer P., (2017): Quadriceps Strength in Patients With Isolated Cartilage Defects of the Knee: Results of Isokinetic Strength Measurements and Their Correlation With Clinical and Functional Results. Orthopaedic Journal of Sports Medicine 5:232596711770372. doi:10.1177/2325967117703726.

Liebensteiner M.C., Platzer H.P., Burtscher M., Hanser F., Raschner C. (2012): The effect of gender on force, muscle activity, and frontal plane knee alignment during maximum eccentric leg-press exercise. Knee Surg Sports Traumatol Arthrosc 20, 510–516. DOI 10.1007/s00167-011-1567-0.

Mueller J., Mueller S., Stoll J., Baur H., Mayer F. (2014): Trunk Extensor and Flexor Strength Capacity in Healthy Young Elite Athletes Aged 11–15 Years. Journal of Strength and Conditioning Research 28, 1328–34. doi:10.1519/JSC.0000000000000280.

Mueller S., Mueller J., Stoll J., Cassel M., Hirschmüller A., Mayer F. (2017): Back Pain in Adolescent Athletes: Results of a Biomechanical Screening. SMIO 01, E16–E22. doi:10.1055/s-0042-122713.

Mueller S., Mueller J., Stoll J., Engel T., Mayer F. (2017): Back pain risk factors in adolescent athletes: suitability of a biomechanical screening tool? British Journal of Sports Medicine 51, 364–5. doi:10.1136/bjsports-2016-097372.205.

Rahm S., Spross C., Gerber F., Farshad M., Buck F.M., Espinosa N. (2013): Operative treatment of chronic irreparable Achilles tendon ruptures with large flexor hallucis longus tendon transfers. Foot Ankle Int 34(8), 1100-10. doi:10.1177/1071100713487725. Epub 2013 Apr 26.