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Total Endoprosthesis – Artificial Joint Replacement

A total endoprosthesis is an artificial joint that completely replaces a worn or damaged joint. It is most commonly used for hip and knee replacements.

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Things worth knowing about "Total endoprosthesis"

A total endoprosthesis is an artificial joint that completely replaces a worn or damaged joint. It is most commonly used for hip and knee replacements.

What Is a Total Endoprosthesis?

A total endoprosthesis, also known as a total joint replacement (TJR), is a surgical implant that completely replaces a severely damaged or worn joint. Unlike a partial prosthesis, which replaces only selected parts of a joint, a total endoprosthesis replaces all joint-forming surfaces. The most common applications are the hip joint (total hip replacement, THR) and the knee joint (total knee replacement, TKR). Less frequently, shoulder, elbow, or ankle joints may also be replaced.

The primary goals of a total endoprosthesis are the permanent restoration of joint function, relief of chronic pain, and a significant improvement in the quality of life of the patient.

Indications – When Is a Total Endoprosthesis Used?

A total endoprosthesis is indicated when conservative treatment options are no longer sufficient and the joint has sustained permanent, severe damage. Typical indications include:

Osteoarthritis: Advanced joint degeneration causing severe pain and restricted mobility
Rheumatoid arthritis: Chronic inflammatory joint disease leading to destruction of articular cartilage
Hip fractures: Especially femoral neck fractures in elderly patients
Avascular necrosis: Death of bone tissue due to impaired blood supply
Congenital joint deformities: Severe dysplasias leading to premature joint degeneration

Components and Materials

A total endoprosthesis consists of several components that together mimic the function of the natural joint:

Metal components: Typically made from titanium alloys or cobalt-chromium alloys, offering high strength and biocompatibility
Bearing surfaces: May consist of polyethylene (plastic), ceramic, or metal – the combination influences durability and wear resistance
Cemented vs. cementless fixation: In cemented fixation, bone cement (polymethylmethacrylate) is used to anchor the implant; in cementless fixation, bone grows directly into the roughened surface of the prosthesis (osseointegration)

Surgical Procedure

The implantation of a total endoprosthesis is performed under general anaesthesia or spinal/epidural anaesthesia and typically lasts between 1 and 3 hours depending on the joint and technique. The surgeon removes the damaged joint surfaces and replaces them with the prosthetic components.

Modern minimally invasive surgical techniques allow for smaller incisions, reduced tissue trauma, and faster recovery. Computer-assisted navigation systems and robotic surgery are increasingly used to ensure precise positioning of the implant.

Rehabilitation and Follow-up Care

Following surgery, physiotherapy typically begins on the first or second postoperative day. The goal is to strengthen the surrounding muscles, restore range of motion, and prevent complications. Rehabilitation includes:

Early mobilisation and gait training
Physiotherapy and muscle strengthening exercises
Lymphatic drainage and physical therapy
Inpatient rehabilitation at a specialised facility

Full weight-bearing capacity of the artificial joint is generally achieved within 3 to 6 months. Modern total endoprostheses have an average lifespan of 15 to 20 years, after which a revision surgery may become necessary.

Possible Risks and Complications

As with any surgical procedure, total endoprosthesis implantation carries certain risks:

Deep vein thrombosis and pulmonary embolism: Formation of blood clots in the leg veins; prevented by anticoagulants and early mobilisation
Infections: Superficial or deep wound infections; in rare cases, periprosthetic joint infection (PJI)
Prosthesis dislocation: Displacement of the implant, particularly in the first weeks after surgery
Aseptic loosening: Mechanical loosening of the implant over time without infection
Nerve injuries: Rare; may cause temporary sensory disturbances
Leg length discrepancy: Minor differences in leg length, usually manageable with insoles

Prevalence and Significance

Total joint replacement is one of the most frequently performed and most successful surgical procedures in orthopaedic and trauma surgery. In Germany alone, more than 400,000 artificial joints are implanted annually, including approximately 230,000 total hip replacements and around 175,000 total knee replacements. The vast majority of patients experience significant pain relief and a marked improvement in quality of life.

References

Endoprothesenregister Deutschland (EPRD): Annual Report 2023. Berlin: BfArM.
National Institute for Health and Care Excellence (NICE): Osteoarthritis: care and management. Clinical guideline CG177. London: NICE; 2014 (updated 2022).
Learmonth ID, Young C, Rorabeck C. The operation of the century: total hip replacement. Lancet. 2007;370(9597):1508–1519.

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