Dnsys X1 Carbon + Z1 DualJoint

The Dnsys X1 Carbon + Z1 DualJoint bundle is one of the most advanced personal exoskeleton systems available on the market in 2026. Its fundamental distinction from single-joint exoskeletons lies in the biomechanical coordination between the two assisted joints — the hip and the knee — which work in synergy rather than independently. Understanding this coordination is essential to grasp why this bundle offers benefits greater than the sum of its parts.

In a normal walking cycle, the hip and knee do not work in isolation — they are coupled mechanically and neurologically. Knee flexion in the swing phase is partly driven by hip flexion through the rectus femoris muscle (biarticular, crossing both joints). Hip extension in the stance phase creates tension in the hamstrings that influences knee stability. This interdependence means that assistance only at the hip or only at the knee creates force asymmetries that can generate postural compensations.

The bundle's hip-knee coordination is ensured by the central AI algorithm that communicates in real time between the X1 Carbon module and the Z1 DualJoint module. This algorithm simultaneously analyzes the state of both joints (angle, angular velocity, load) and calculates a coordinated assistance profile that respects the natural biomechanical couplings. In the swing phase, hip and knee assistance are coordinated in time: hip flexion is assisted slightly ahead of knee flexion, respecting the natural neuromotor sequence. In the stance phase, hip extension is assisted in coordination with stabilization of the knee in slight flexion (the knee does not lock into hyperextension, which would be dangerous).

The “DualJoint” in the name refers precisely to this dual-joint coordination. The Z1 alone (Single Joint) assists the knee in isolation. The Z1 DualJoint is the version designed to work in tandem with the X1, with an inter-module communication protocol and a coordination algorithm that is not available on the Z1 SingleJoint.

In practice, bundle users report a walking experience that feels more “natural” than using either module alone — the assistance is perceived as global and integrated rather than as two separate sources of help. This naturalness is a sign that the biomechanical coordination is working correctly: the brain integrates the external assistance into the usual motor pattern with no conscious effort of adaptation.

The range of the Dnsys X1 Carbon + Z1 DualJoint bundle is a complex question because the two modules have different batteries and consumption levels. Understanding how the bundle's energy management works is essential for planning your outings.

The X1 Carbon carries a battery offering 18 to 20 km of range in standard conditions. The Z1 DualJoint carries its own dedicated battery, separate from the X1's — the Z1's announced range is 14 to 16 km per knee in standard use (28 to 32 km cumulative for the two knee modules). These batteries are managed independently but synchronized by the bundle's AI algorithm to ensure maximum simultaneous use time.

In practice, the bundle's effective range when using all three modules at once (one X1 Carbon + two Z1) is determined by the most demanding module. In most conditions, the X1 Carbon reaches 20% battery before the Z1 modules — it is what sets the overall range on the low side. The bundle's coordination AI takes the battery levels of all three modules into account and can adjust assistance so all three modules reach the low threshold (20%) at the same time, avoiding situations where one module runs out before the others.

For a typical hike with 600 m of elevation gain over 14 km: the bundle generally lasts the whole day with a 15 to 25% margin remaining across all batteries. For a long 22 km hike: a midday recharge is recommended for the X1 Carbon (the most heavily used module). Good news: the bundle's three batteries (X1 + left Z1 + right Z1) recharge simultaneously through a single multi-port USB-C charger supplied in the kit — a full recharge of the three modules takes 100 to 120 minutes from the 20% level.

For big outings, a 100W USB-C power bank (not included, recommended minimum capacity 27,000 mAh to recharge all three modules simultaneously) allows a full recharge during an extended lunch break. The bundle's energy management can be viewed in real time in the Dnsys app, which shows the individual levels of each module and the overall estimated remaining range.

Post-surgical rehabilitation of the lower limb is an indication with strong potential for the Dnsys X1 Carbon + Z1 DualJoint bundle, but it is also an area that requires careful analysis of the indications and contraindications depending on the type of surgery and the stage of recovery. Here is an analysis structured by type of surgery.

For total knee replacement (TKR): the first post-operative weeks (roughly day 0 to day 45) require supervised rehabilitation with certified medical equipment under physiotherapist supervision — using the bundle without medical approval is discouraged in this phase. From the active recovery phase (day 45 to day 180), the bundle can be used alongside rehabilitation to allow progressive outdoor outings over longer distances. The Z1's assistance at the prosthetic knee reduces the load on the prosthesis on uneven terrain, lowering the risk of falling and allowing an earlier and more confident return to outdoor walking. Several physiotherapists specializing in post-TKR recovery have built the bundle into their progressive outing protocols.

For anterior cruciate ligament (ACL) reconstruction: in the advanced rehabilitation phase (typically from month 4-5 depending on the protocol), the Z1 DualJoint provides external ligament support that complements muscle strengthening. The assistance is particularly useful when resuming walking on varied terrain (stones, cross-slopes, descents) where the operated knee is subjected to unexpected stresses. The exoskeleton does not replace the rigid post-operative brace prescribed by the surgeon for the first weeks — it takes over in the active-resumption phase when the rigid brace is no longer needed.

For partial meniscectomy (removal of part of the meniscus): this is probably the simplest post-surgical indication for the bundle. Return to physical activity after meniscectomy is generally quick (3 to 6 weeks), but residual pain on mountain terrain can persist for several months. The bundle lets you resume more demanding hikes sooner, by reducing the compressive load on the operated knee during the full healing of the remaining tissue.

In all cases of post-surgical rehabilitation, the recommended approach is first to consult your surgeon and physiotherapist to check that using the bundle is compatible with your rehabilitation protocol. Dnsys offers a technical document for healthcare professionals detailing the assistance parameters, the available modes and the known contraindications — available free on request from customer service.

Installing the Dnsys X1 Carbon + Z1 DualJoint bundle involves fitting three modules (the X1 Carbon for the hip + two Z1s for the knees) — a more complex operation than a single-joint exoskeleton but less difficult than you might imagine. Here is the complete procedure and the times to expect.

The first installation (on first use) takes 35 to 50 minutes with the quick-start guide or the video tutorials in the Dnsys app. It breaks down as follows. Installing the X1 Carbon (15-20 minutes): same procedure as described for the X1 exoskeleton alone (width, motor height, strap tightening). Installing the left Z1 (8-10 minutes): the left knee module attaches with two cuffs: a thigh cuff (upper leg) and a calf cuff (lower leg). Adjust the length of the central frame according to the length of your tibia (measurement marker supplied in the guide). Tighten the straps until firm compression without hindering circulation. Installing the right Z1 (8-10 minutes): identical procedure for the right knee. Software configuration (5-10 minutes): pair the three modules simultaneously through the Dnsys app, carry out the coordination calibration (200 meters of walking on flat terrain), and customize the mode preferences.

Daily setup (once the settings are memorized) takes 6 to 12 minutes depending on your practice. Experienced bundle users get down to 4 to 5 minutes. The optimized sequence for quick setup is: X1 Carbon first (with the belt already adjusted, it goes on in 60 seconds), then left Z1, then right Z1, then simultaneous power-on of the three modules and automatic synchronization via Bluetooth (30 seconds). For repeated removals and refits during an outing (meal breaks, technical sections), the Z1 cuffs' quick-release clips let you take off the knee modules in 20 to 30 seconds each without disturbing the adjustment.

A few tips to optimize setup. Wear thin tights or leggings as a first layer under the Z1 cuffs — the cuff grips better on fabric than on bare skin and avoids irritation on long outings. Note your settings on each component in the Dnsys app to find them exactly on each use. In winter with several layers of clothing, allow 5 extra minutes to pass the X1 arms over the clothing and position the Z1 cuffs under the pants.

Bilateral knee osteoarthritis (gonarthrosis) is one of the most frequent indications that lead people to take an interest in the Dnsys X1 Carbon + Z1 DualJoint bundle. It is a painful condition that affects millions of people and significantly reduces the ability to walk, climb stairs and do outdoor activities. The bundle can bring real benefits in this indication — with important nuances to know depending on the stage of the condition.

Knee osteoarthritis is characterized by degradation of the joint cartilage, narrowing of the joint space and pain during weight-bearing movements. The main factor in worsening and pain is intra-articular pressure under load — particularly on descents and in a semi-flexed position. The Z1 DualJoint exoskeleton reduces this joint pressure by taking on part of the compressive force that passes through the knee with each step. Studies on similar knee-offloading devices show a 20 to 35% reduction in compressive force depending on the assistance level — which translates directly into less pain when walking.

For osteoarthritis at stages 1 and 2 (Kellgren-Lawrence), the bundle offers very significant benefits. At these stages, the cartilage is partly intact and pain is mainly linked to episodes of overload. The Z1 DualJoint's assistance lets you maintain regular physical activity by reducing joint load, which is itself therapeutic: moderate exercise under reduced load slows the progression of osteoarthritis by maintaining cartilage nutrition and strengthening the knee's stabilizing muscles. Continuing to walk thanks to the exoskeleton is better for osteoarthritis progression than stopping activity out of fear of pain.

For osteoarthritis at stages 3 and 4 (severe osteoarthritis with almost no or no joint space), the benefits are more limited. If the knee is painful even at rest, or if episodes of mechanical locking occur, an orthopedic consultation takes priority before considering using an exoskeleton. The bundle can be used alongside medical treatment (injections, braces, rehabilitation), but does not replace appropriate medical management of severe gonarthrosis.

Pairing with the X1 Carbon module is particularly relevant in the context of bilateral osteoarthritis. Gonarthrosis is often accompanied by quadriceps weakness and an antalgic gait that changes overall posture, secondarily overloading the hips. The X1 Carbon's hip assistance, by reducing hip load and improving overall posture, has an indirect positive effect on knee load — the two modules complement each other in a logic of multi-joint offloading of the whole lower limb.