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Partial Endoprosthesis: Definition, Use & Treatment
A partial endoprosthesis is an artificial joint implant that replaces only one part of a damaged joint. It is commonly used for hip or knee joint degeneration.
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A partial endoprosthesis is an artificial joint implant that replaces only one part of a damaged joint. It is commonly used for hip or knee joint degeneration.
What is a Partial Endoprosthesis?
A partial endoprosthesis (also known as a hemiarthroplasty or partial joint replacement) is an orthopaedic implant that replaces only the damaged portion of a joint, leaving the healthy parts intact. Unlike a total endoprosthesis, in which the entire joint is replaced, a partial endoprosthesis is a joint-preserving surgical option. It is preferred when joint damage is clearly limited to one specific area and the remaining joint structures are still in good condition.
Areas of Application
Partial endoprostheses are most commonly used in the following joints:
- Hip joint: In cases of a femoral neck fracture, particularly in older patients, only the femoral head (the ball of the hip joint) is replaced using a hip hemiarthroplasty.
- Knee joint: When osteoarthritis is confined to one compartment of the knee, a unicondylar knee replacement (also called a knee sled or partial knee replacement) is used to replace only the affected side of the joint.
- Shoulder joint: In certain types of joint damage, such as after a severe fracture or in advanced arthritis, a partial prosthesis may replace only the humeral head.
When is a Partial Endoprosthesis Recommended?
A partial endoprosthesis is a suitable treatment option when:
- Joint damage (e.g., due to osteoarthritis, fracture, or avascular necrosis) is confined to a defined region of the joint,
- the remaining part of the joint is still well preserved and functional,
- conservative treatments have been exhausted without sufficient pain relief,
- the patient is in an overall condition suitable for surgery.
Surgical Procedure
The procedure is performed under general anaesthesia or spinal anaesthesia. The surgeon opens the joint, removes the damaged cartilage and bone in the affected area, and implants the prosthetic component. Fixation is achieved either with bone cement or through a cementless design that allows bone to grow directly into the implant surface. Compared to a total joint replacement, the procedure is generally less complex and is associated with shorter operative times and faster recovery.
Rehabilitation and Follow-Up Care
Following surgery, physiotherapy begins promptly to strengthen the surrounding muscles and restore joint mobility. Key elements of follow-up care include:
- Guided physiotherapy exercises for joint mobility and muscle strength
- Pain management and anticoagulation therapy to prevent blood clots
- Regular check-up appointments with an orthopaedic or trauma surgeon
- Gradual weight-bearing progression as directed by the treating physician
Advantages Over Total Joint Replacement
In suitable cases, a partial endoprosthesis offers several benefits:
- Less bone loss, as only the damaged section is replaced
- Shorter operative duration and reduced surgical risk
- Faster rehabilitation and return to daily activities
- If the partial prosthesis fails, conversion to a total joint replacement remains possible
Risks and Possible Complications
As with any surgical procedure, implantation of a partial endoprosthesis carries certain risks:
- Infection of the surgical site or the implant
- Loosening of the prosthesis over time
- Progression of osteoarthritis in the remaining natural joint compartment, potentially requiring conversion to a total endoprosthesis
- Deep vein thrombosis or pulmonary embolism
- Nerve or vascular injury in rare cases
References
- Deutsche Gesellschaft f'ur Orthop'adie und Orthop'adische Chirurgie (DGOOC): Guideline on Knee Joint Replacement, 2023. Available at: www.awmf.org
- Breusch S., Mau H., Sabo D.: Clinical Guide to Orthopaedics and Trauma Surgery. 8th edition, Urban & Fischer, Munich, 2019.
- Learmonth I. D., Young C., Rorabeck C.: The operation of the century: total hip replacement. The Lancet. 2007;370(9597):1508–1519.
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