Secondhand Chattanooga Artromot K4 Knee and Hip CPM Device

Objective AI Report

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Report date: 15.01.2026

ARTROMOT K4 Knee and Hip CPM Device Analysis Report

Device Identification

The device in the examined visuals is a motorized CPM (Continuous Passive Motion) device used in the field of physical therapy and rehabilitation, designed to increase patients’ joint range of motion and accelerate the recovery process. The product consists of a rail system, a motor unit, and a patient hand control, developed for lower extremity (knee and hip) rehabilitation.

Brand and Model

As a result of a detailed examination of the visuals, the ARTROMOT brand name is seen in capital letters on the upper part of the device’s hand control and on the labels on the side surfaces of the device’s main body. Additionally, on the model label on the side surface of the device, the inscription “K4” is clearly readable right next to the brand name. Based on these visual evidences, the product’s brand is definitively identified as ARTROMOT, and its model as K4.

Originality

The product’s overall design language, logo fonts, label placements, and the unique button layout of the hand control (blue and green/red button combination) are in direct conformity with original Artromot products. The quality of industrial craftsmanship and the compatibility of the parts indicate that the product is an original equipment.

Areas of Use

The ARTROMOT K4 is designed for use in orthopedic and traumatology clinics, physical therapy centers, or home care processes. Its primary purpose is to move the patient’s joints painlessly and at controlled angles after knee and hip surgeries (e.g., prosthetic surgery, ligament repair). This device is used to prevent joint stiffness, reduce edema, and restore range of motion (ROM).

Quantity Information

The visuals show 1 (one) main CPM unit and 1 (one) hand control unit connected to it via a cable. Additionally, leg support attachments and a foot fixation boot are mounted on the device. In total, a single set of the device (ready for use by one patient) is present.

General Condition

The device generally has a used (second-hand) appearance. It is not in the condition of a very new or freshly unboxed product. There are signs of use and dust accumulation that may have resulted from storage conditions. However, no major structural damage that would compromise the device’s integrity has been visually detected.

Physical Deformation

In the metal components of the product, particularly at the adjustment points of the telescopic rails (areas where black screw heads are located), white bandage or tape residues from previous uses have been observed. Adhesive marks may be present in these areas. On the blue fabric pads and the black foot boot, pilling, wrinkling, and slight changes in color tone (soiling) due to use are visible. While no deep scratches or cracks are apparent on the device’s white plastic casing, there are superficial dirt marks in places.

Mechanical Components

The metal tubes forming the device’s chassis appear straight; there are no signs of bending or significant rusting (on the rails). The black compression knobs for leg length adjustment and hinge points are in place. No apparent deformation that would obstruct the movement path of the sliding mechanism is noticeable.

Electronic Components

The internal structure of the device’s electronic brain and motor section cannot be seen as they are enclosed within a plastic casing. However, the hand control, which is an external unit, and its connection cables are present in the visual. The LCD screen of the hand control is in an off position, therefore, no comments can be made regarding the screen’s pixel status or operational functions based on the visual.

Accessories

• Hand Control: A wired control unit that manages all functions of the device. It has “+” (plus), “-” (minus), “MENU”, “START”, and “STOP” buttons.
• Patient Support Kits: Two blue, sponge/fiber-filled calf and thigh support pads, and one black, hard plastic-backed, Velcro-strapped foot boot (ankle stabilizer) are present.
• Power Cable: A coiled (spiral) power cable emerging from the main body of the device, with a standard grounded plug head at its end, is visible. The cable is somewhat dusty and loosely coiled.

Battery Status

As far as can be understood from the visuals, the device operates with mains electricity (AC) via the main power cable. No external or visible battery pack has been detected.

Label Information

• ARTROMOT-K4: Product model name.
• On the hand control keypad; START, STOP, MENU function indications.

Size and Compatibility

The device’s telescopic metal arms are adjustable for different patient heights (femur and tibia lengths). The width of the leg rests and the overall dimensions of the device in the visual indicate that the product is designed for “Adult” use. There is no special adapter for pediatric (small child) use visible in the image.

Documents

No user manual, invoice, warranty certificate, technical service report, or calibration certificate belonging to the device is present in the visuals.

Potential Malfunction Risk

Based on visual inspection, the general condition of the device is at an “average-good” level. No “high-risk” situation that would directly impede the device’s operation, such as severe rusting, broken parts, or cable breaks, has been observed. However, the tape residues on the metal rails may need to be cleaned; otherwise, they could affect the mechanism’s smoothness. The fact that the coiled cables maintain their form is a positive detail.