Physiomed: Biomechanical therapy systems / CON-TREX® / CON-TREX® MJ


Isokinetic multijoint module for testing and training the major joints

Highlight features of CON-TREX® MJ

Product description

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 musclestrength 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 the wide range of accessories.


  • high-precision isokinetic mode
  • ballistic mode
  • active compensation of gravity
  • unique combined load types
  • precise and very close adjustment of the rotary axis of the dynamometer in relation to the joint axis
  • sampling rate of 4000 Hz for highest precision
  • play-free drive train
  • EMG synchronisation
  • three-level safety concept
  • individually customisable reports

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.

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 optimisation 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:

Orthopaedic 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 analyse 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 mobilisation 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 continuously 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 visualises 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 evaluating physique and optimising 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 optimisation 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 unequalled high standards in regard to accuracy of measurement and reproducibility of the collected parameters. 


Inbussschlüssel 14

Allen wrench 14

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Dynamometer-Klemmung für CON-TREX MJ

Dynamometer clamping device for CON-TREX® MJ

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Gebrauchsanweisung CON-TREX

Operating instructions CON-TREX®

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Schulterpolster anthrazit

Shoulder pad anthracite

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Gurt Sitzbefestigung MJ 75 cm mit Schrauben und Anker

Strap seat attachment MJ 75 cm with screws an...

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ACL (Kreuzband) Schutz-/Anti-Schublade-Adapter

ACL (anterior cruciate ligament) Protection/a...

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Ankle adapter

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Grundadapter für freie Bewegung

Base adapter for free movement

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Grundadapter lang

Base adapter long

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Grundadapter kurz

Base adapter short

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Satz Adapter Einsätze, komplett mit Steckbrett 50660000

Complete set of small inserts including tray ...

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Distanzstab 30 cm für freie Bewegung (Kohlefaser)

Distance rod 30 cm for free movement (carbon ...

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Distanzstab 60 cm für freie Bewegung (Kohlefaser)

Distance rod 60 cm for free movement (carbon ...

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Doppelgriff für freie Bewegung

Double hand grip for free movement

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EMG Platine für MJ/WS/LP, V01

EMG board for MJ/WS/LP, V01

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EMG Verbindungskabel

EMG interconnect cable

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Ellbogen-Adapter für Sup/Pro

Elbow adapter Sup/Pro

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Hand adapter

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Handgriff links für MJ

Hand grip for MJ system, left

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Handgriff rechts für MJ

Hand grip for MJ system, right

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Hip adapter

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Knee adapter

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Leg stabiliser

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Shoulder adapter

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Adapter für Schulter-Rotation

Shoulder rotation adapter

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Einzelgriff flexibel für freie Bewegung

Single hand grip flexible for free movement

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Einzelgriff starr für freie Bewegung

Single hand grip rigid for free movement

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Stützrolle, beidseitig

Stabilisation bar with roll, bilateral

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Stützrolle einseitig, Ø 135 mm

Stabilisation bar with roll, unilateral, Ø 13...

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Stützrolle einseitig, Ø 95 mm

Stabilisation bar with roll, unilateral, Ø 95...

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Stütze Schulterrotation

Stabilisation for shoulder rotation

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Lenkrad, Durchmesser 37 cm

Steering wheel, diameter 37 cm

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Klemmung für Stützen

Support clamping device

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Stützauflage breit

Support large

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Stützauflage schmal

Support narrow

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Stützschiene lang

Support rail long

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Stützschiene kurz

Support rail short

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Upgrade CON-TREX® PM


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Lochwand für Standard-Adapterset

Wallboard for set of standard adapters

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Handgelenk Ex/Flex Adapter

Wrist adapter

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CON-TREX® - reliability and validity

Caruso J., Brown L.E., Tufano J.J. (2012): The reproducibility of isokinetic dynamometry data. Isokinet Exerc Sci 20:239–53. doi:10.3233/IES-2012-0477.

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.

Guilhem G., Giroux C., Couturier A., Maffiuletti N.A. (2014): Validity of trunk extensor and flexor torque measurements using isokinetic dynamometry. J Electromyogr Kinesiol

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.

Müller J., Müller S., Stoll J., Fröhlich K., Baur H., Mayer F. (2014): Reproducibility of maximum isokinetic trunk strength testing in healthy adolescent athletes. Sports Orthop. Traumatol. 30, 229–237.

CON-TREX® - clinical and scientific application

Baray A.L., Philippot R., Farizon F., Boyer B., Edouard P. (2014): Assessment of joint position sense deficit, muscular impairment and postural disorder following hemi-Castaing ankle ligamentoplasty. Orthop Traumatol Surg Res 100 (6 Suppl), 271-4. doi:10.1016/j.otsr.2014.02.014. Epub 2014 Aug 22.

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.

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