Secondhand Ottobock C-LEG Compact Microprocessor Prosthetic Knee Joint

Objective AI Report

Disclaimer: I am Medbidding AI. I am an unbiased AI robot. I have generated the following report automatically (without human intervention). The report was prepared by examining only the product images in the ad in detail. The report may contain errors. Medbidding and other parties disclaim any liability that may arise from this report or reliance on its contents. If you have any questions or notice an error in the report, please contact Medbidding engineers.

Report date: 23.12.2025

Otto Bock C-LEG Compact Prosthetic Knee Joint Analysis Report

Device Identification and General Description

The product examined in the images is a high-technology prosthetic knee joint system developed for individuals who have undergone lower extremity amputation. The product has an integrated structure consisting of a body, hydraulic unit, and tube adapter. The general design language of the device and the technical indicators on it suggest that it is an advanced (microprocessor-controlled hydraulic) prosthetic hardware rather than a passive mechanical joint.

Brand and Model Identity

The writings and logos on the product have been examined in detail, and the following identity information has been determined with 100% certainty:

• Brand: Otto Bock (The original handwritten style logo and the slogan “QUALITY FOR LIFE” are clearly visible on the back of the product).
• Model: C-LEG compact (The model name is engraved on the side of the body in a large and legible font).
• Origin: The manufacturer’s address information is “Kaiserstraße 39, 1070 Wien – Austria,” and the stamp at the bottom reads “MADE IN AUSTRIA.”

Label Information and Technical Data

The following technical data has been read from the grey label on the rear surface of the product and the stamps on the lower metal clamp part:

• Load Capacity: The maximum carrying capacity of the device is clearly stated with the inscription “MAX. 100 kg!”.
• Adjustment Scales: On the rear panel, there are graded weight/stop reference lines believed to be for prosthetic adjustments, such as “165lbs stop”, “75kg stop”, “220lbs stop”, “100kg stop”. Additionally, there is a vertical scale numbered 5, 6, 7, 8.
• Reference/Part Codes: On the metal of the lower connection part, “2R82” (a partially legible code fragment consistent with Otto Bock terminology) and a serial number stamp starting with “SN 2011…” are visible. Although the full serial number cannot be completely read due to the visual angle, its beginning as 2011 can be discerned.

Physical Condition and Deformation Analysis

The device is in a used condition. While its general condition appears sound in terms of structural integrity, significant cosmetic wear is present:

• Body (Casing): Numerous friction marks, hairline scratches, and black stains resulting from use are visible on the silver-colored metallic side surfaces of the device. Scratches are particularly concentrated in the areas around the “C-LEG compact” inscription.
• Top Cover: Slight surface dullness and minor abrasions along the edges have been observed on the dark plastic/carbon composite cover at the very top of the joint.
• Lower Tube (Pylon): The aluminum tube at the bottom is relatively clean, but there are mounting marks on the screw holes and metal surface at the connection point.
• Crack/Fracture: No deep cracks or broken parts were detected on the device’s body in the images. Only superficial deformations are present.

Mechanical and Electronic Component Examination

Mechanical: The hydraulic piston rod located at the rear of the device appears bright and clean; no rust or oil leakage (seepage) was visually detected on it. The clearances at the bending points of the joint are regular.

Electronic: This model (C-Leg Compact) inherently features an electronic and rechargeable system. However, the charging port cover or a light indicator showing battery status is not active in the image. The condition of the internal mechanism cannot be seen from the outside.

Accessories and Missing Parts Information

A total of 1 unit of the product (Only the knee joint and its attached lower tube) is present in the images. The following parts, essential for the product’s use, are NOT visible in the images:

• Charger and adapter.
• Cosmetic outer cover (sponge/foam sleeve).
• Upper socket connection parts.
• Warranty certificate or user manual.

Areas of Use and Compatibility

The Otto Bock C-LEG compact is a medical product that provides high stability, used to restore walking function for individuals who have undergone above-knee (transfemoral) amputation. The “Compact” model is generally designed for users with lower activity levels or higher stability needs. It is suitable for adult patients with a maximum weight of 100 kg.

Risk Assessment and Concluding Comments

The product visually maintains its integrity, but the numerous scratches on it indicate a history of long-term or active use. The inscription “SN 2011…” suggests that the manufacturing year or date of entry into service could be around 2011, meaning the device might be over 10 years old.

In microprocessor-controlled prosthetics, battery life, hydraulic seal integrity, and sensor calibration are critical factors that cannot be determined visually. Although no severe physical damage (crushing, fragmentation) is visible, potential buyers must inquire about the device’s electronic functions, charge retention capacity, and service maintenance history (seal and hydraulic fluid replacement). The device, in its current state, should be considered as a “second-hand part that may require maintenance”.