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Knee Arthrodesis Guide

Ra
Rajasekaran RB, Ponniah HS, Pa...
January 01, 2026
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6 min read 1,108 words knee arthrodesis techniques Medically Reviewed

Overview

Knee arthrodesis is a surgical procedure used to treat PJI following a failed TKA. This study compared three knee arthrodesis techniques: intramedullary nailing, LRS external fixator, and compression plating, to manage infected TKA. According to the study, knee arthrodesis has shown to be an effective method to control infection, achieve fusion, and provide pain relief following failed infected TKA (Source: PubMed). The study found that external fixation emerged as the preferable method for knee arthrodesis, showing fewer complications, shorter union times, and no additional surgeries compared to intramedullary nailing and compression plating.

The study examined the outcomes of 46 patients who underwent knee arthrodesis following failed TKA due to infection. The average follow-up was 29.1 months, and the results showed that bony fusion was achieved in 41 knees (89.1%). The study highlights the importance of selecting the appropriate surgical technique for knee arthrodesis to ensure optimal outcomes and minimize complications.

What This Study Examined

This study compared the outcomes of three knee arthrodesis techniques: intramedullary nailing, LRS external fixator, and compression plating. The study examined the complications, radiological, and functional outcomes of these techniques in patients who underwent knee arthrodesis following failed TKA due to infection.

Why This Matters for Patients

This study matters for patients who have undergone TKA and are experiencing infection or other complications. Knee arthrodesis is a surgical procedure that can provide pain relief and improve function in patients with failed TKA. Understanding the different surgical techniques and their outcomes can help patients make informed decisions about their treatment options.

Medical Background

Knee arthrodesis is a surgical procedure that involves the fusion of the tibia and femur bones in the knee joint. This procedure is typically performed to treat severe OA or PJI that has not responded to other treatments. The goal of knee arthrodesis is to eliminate pain and improve function in the affected knee.

DO is a technique used in knee arthrodesis to promote bone growth and fusion. This technique involves the use of an external fixator or internal device to gradually distract the bone segments, allowing for new bone growth and fusion.

How the Procedure Works

The knee arthrodesis procedure typically involves several steps. First, the surgeon will remove any infected or damaged tissue and bone from the knee joint. Next, the surgeon will use an external fixator or internal device to stabilize the knee joint and promote bone growth. The external fixator is a device that is attached to the outside of the leg, while the internal device is implanted inside the leg.

Who Is a Candidate?

Patients who have undergone TKA and are experiencing infection or other complications may be candidates for knee arthrodesis. The ideal candidate for knee arthrodesis is a patient who has a severe infection or has failed to respond to other treatments. Patients who are considering knee arthrodesis should discuss their options with their surgeon to determine if this procedure is right for them.

Clinical Summary

  • Procedure: Knee arthrodesis is a surgical procedure that involves the fusion of the tibia and femur bones in the knee joint.
  • Typical Duration: The typical duration of the procedure is several hours, depending on the complexity of the case.
  • Recovery: The recovery time for knee arthrodesis can vary depending on the individual patient and the complexity of the procedure.
  • Success Rate (general): The success rate for knee arthrodesis is generally high, with most patients experiencing significant pain relief and improved function.

Study Methodology

This study was a retrospective analysis of 46 patients who underwent knee arthrodesis following failed TKA due to infection. The patients were treated with one of three surgical techniques: intramedullary nailing, LRS external fixator, or compression plating. The study examined the complications, radiological, and functional outcomes of these techniques.

Patient Selection Criteria

The patients in this study were selected based on their diagnosis of failed TKA due to infection. The patients were treated with knee arthrodesis and followed for an average of 29.1 months.

Outcome Measures

The outcome measures in this study included the rate of bony fusion, complications, and functional outcomes. The study also examined the patient-reported outcome measures, including pain and functional status.

Results & Findings

The results of this study showed that bony fusion was achieved in 41 knees (89.1%). The study found that the external fixation group had the shortest time to union and no major complications or amputations. The compression plating group had a significantly shorter time to union compared to the intramedullary nailing group.

Key Outcomes

The key outcomes of this study included the rate of bony fusion, complications, and functional outcomes. The study found that knee arthrodesis is an effective treatment option for patients with failed TKA due to infection.

Complications & Risks

The complications and risks associated with knee arthrodesis include infection, non-union, and ND. The study found that the external fixation group had fewer complications and risks compared to the other groups.

Key Takeaways for Patients

  • Knee arthrodesis is a surgical procedure that can provide pain relief and improve function in patients with failed TKA.
  • There are several surgical techniques available for knee arthrodesis, including intramedullary nailing, LRS external fixator, and compression plating.
  • Patients should discuss their options with their surgeon to determine the best treatment plan for their individual needs.
  • Patient-reported outcome measures, including pain and functional status, are important indicators of the success of the procedure.

When considering knee arthrodesis, patients should ask their surgeon about the different surgical techniques and their outcomes. Patients should also ask about the potential complications and risks associated with the procedure.

Frequently Asked Questions

What is knee arthrodesis?
Knee arthrodesis is a surgical procedure that involves the fusion of the tibia and femur bones in the knee joint. This procedure is typically performed to treat severe OA or PJI that has not responded to other treatments.
What are the benefits of knee arthrodesis?
The benefits of knee arthrodesis include pain relief, improved function, and elimination of infection. This procedure can also improve the overall quality of life for patients with failed TKA.
What are the risks and complications of knee arthrodesis?
The risks and complications of knee arthrodesis include infection, non-union, and ND. Patients should discuss their individual risks and complications with their surgeon.
How long does the recovery process take?
The recovery process for knee arthrodesis can vary depending on the individual patient and the complexity of the procedure. Patients can expect to spend several weeks or months recovering from the procedure.
What is the success rate of knee arthrodesis?
The success rate of knee arthrodesis is generally high, with most patients experiencing significant pain relief and improved function. However, the success rate can vary depending on the individual patient and the complexity of the procedure.
More on: knee arthrodesis techniques Last reviewed: August 28, 2026

Community Disclaimer

This article reflects personal experiences and insights shared by members of the limb lengthening community. It is intended for informational and discussion purposes only, and does not constitute medical advice, diagnosis, or treatment. Individual experiences may vary. Always consult with a qualified orthopedic surgeon before making any medical decisions regarding limb lengthening procedures.

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Knee Flexion Contracture Treatment: A Guide to Femoral Anterior Distal Hemiepiphysiodesis

OverviewThis comprehensive guide delves into the innovative treatment of knee flexion contractures in children with arthrogryposis, a condition characterised by joint contractures and muscle weakness. The study focuses on the effectiveness of femoral anterior distal hemiepiphysiodesis (FADHE), a surgical procedure to correct these contractures and improve mobility. With a large patient cohort and long-term follow-up, the research provides valuable insights into the management of this challenging orthopedic condition.Arthrogryposis is a rare condition that affects muscle development and joint mobility, often resulting in multiple joint contractures. Knee flexion contractures, where the knee is persistently bent, can significantly impact a child's ability to walk and perform daily activities. FADHE is a surgical technique that manipulates bone growth to gradually correct these contractures, offering a potential solution for patients with arthrogryposis.What This Study ExaminedThe study, conducted over 8 years, evaluated the outcomes of FADHE in 57 children with arthrogryposis who underwent 90 procedures to address knee flexion contractures. The mean age of the patients at surgery was 7.1 years, indicating the procedure's applicability in the pediatric population.Why This Matters for PatientsThis research is significant for patients and caregivers as it provides evidence-based information on the effectiveness and safety of FADHE for treating knee flexion contractures in arthrogryposis. By understanding the procedure's success rates, potential complications, and long-term outcomes, patients can make informed decisions about their treatment options.Medical BackgroundKnee flexion contractures are a common orthopedic challenge in children with arthrogryposis, a condition characterised by multiple joint contractures and muscle abnormalities. These contractures can significantly limit a child's ability to walk and perform daily activities.Femoral Anterior Distal Hemiepiphysiodesis (FADHE) is a surgical procedure designed to correct knee flexion contractures by gradually lengthening the femur and improving knee extension. This technique involves the controlled arrest of bone growth in the distal femoral epiphysis, allowing the proximal femoral metaphysis to lengthen and correct the contracture.How the Procedure WorksFADHE is a surgical technique that utilises the body's natural bone growth process to correct knee flexion contractures. During the procedure, a hemiepiphysiodesis plate is placed on the anterior aspect of the distal femur. This plate slows down or stops growth in that specific area, allowing the proximal femur to continue growing and lengthening, thereby straightening the knee.The procedure is typically performed under general anesthesia and may involve an arthrotomy and posterior release to address soft tissue contractures. The hemiepiphysiodesis plate remains in place for several months, during which the patient undergoes regular follow-ups to monitor bone growth and knee alignment.Who Is a Candidate?FADHE is generally recommended for children with arthrogryposis who have knee flexion contractures that significantly impact their mobility and daily activities. The procedure is most effective for contractures up to 55 degrees, with or without a concomitant posterior release. Patients with contractures greater than 55 degrees may require additional surgical interventions.Clinical SummaryProcedure: Femoral Anterior Distal Hemiepiphysiodesis (FADHE)Typical Duration: The hemiepiphysiodesis plate is typically left in place for several months, during which the patient undergoes regular follow-ups.Recovery: Postoperative recovery involves a period of immobilization, followed by physical therapy to regain knee range of motion and strength.Success Rate (general): The study found that FADHE effectively improved knee flexion contractures, with a mean correction of 2.1 degrees per month.Study MethodologyThis retrospective study analyzed the outcomes of FADHE in children with arthrogryposis over an 8-year period. The patient population consisted of 57 children who underwent 90 FADHE procedures for knee flexion contractures.Patient Selection CriteriaThe study included children with arthrogryposis who had knee flexion contractures that limited their ambulation. The mean age at surgery was 7.1 years, indicating the procedure's applicability in the pediatric population.Outcome MeasuresThe primary outcome measure was the improvement in knee flexion contractures, assessed by measuring the knee range of motion preoperatively, postoperatively, and at clinical follow-ups. Secondary outcomes included ambulatory ability and the recurrence rate of contractures.Results & FindingsThe study found that FADHE was effective in correcting knee flexion contractures in children with arthrogryposis. The mean preoperative flexion contracture of 35 degrees improved significantly to 7 degrees at hardware removal, an average of 17.5 months after implantation. This translates to a correction rate of 2.1 degrees per month.Knees with contractures of 25 degrees or less showed good correction without a posterior release. Contractures between 30 and 55 degrees generally responded well with a concomitant posterior release. 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Notably, 16 of the 31 patients who were not independent ambulators preoperatively achieved independent ambulation by the final follow-up.Key OutcomesFADHE effectively improved knee flexion contractures in children with arthrogryposis, with a mean correction of 2.1 degrees per month.Contractures of 25 degrees or less responded well without a posterior release.Contractures between 30 and 55 degrees generally improved with a concomitant posterior release.The overall recurrence rate was 0.61 degrees per month, with repeat hemiepiphysiodesis required in some cases.FADHE helped improve ambulation, with 16 out of 31 non-independent ambulators achieving independent walking by the final follow-up.Complications & RisksThe study reported that 65 knees underwent concomitant posterior releases, and eight knees required treatment for recurrences after initial correction with distraction arthrodiastasis. 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In the knees, this can lead to flexion contractures, making it difficult to straighten the legs fully.How does FADHE work to correct knee flexion contractures?FADHE involves placing a small plate on the front of the lower femur to temporarily stop growth in that area. This allows the upper femur to continue growing, effectively lengthening the bone and straightening the knee.What is the success rate of FADHE for knee contractures?The study found that FADHE effectively improved knee flexion contractures, with a mean correction of 2.1 degrees per month. Most patients achieved significant improvement in knee range of motion.Are there any risks or complications associated with FADHE?As with any surgery, there are risks involved. Recurrence of contractures is a common challenge, but it can be managed with repeat surgery. Postoperative care, including physical therapy and orthotic devices, is crucial for optimal outcomes.How long does it take to recover from FADHE surgery?Recovery time varies, but patients can expect a period of immobilization followed by physical therapy. The hemiepiphysiodesis plate is typically removed after several months, and ongoing care may be needed to maintain knee function. Related Articles A Comprehensive Guide to Humeral Lengthening in Achondroplasia: Patient Perspectives and Treatment Outcomes Revolutionizing Achondroplasia Treatment: Understanding Vosoritide Therapy A Comprehensive Guide to Limb Lengthening in Achondroplasia: Understanding the Costs, Benefits, and Risks The Impact of Type 1 Diabetes Mellitus on Growth Patterns in Saudi Children and Adolescents: A Comprehensive Guide

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Clinical Insight

Tibial Implant Migration After Knee Replacement: Does Bone Density Matter?

Overview Patients who undergo knee replacement surgery—whether a total knee arthroplasty (TKA) or a unicompartmental knee arthroplasty (UKA)—often wonder how their bone health will affect the long‑term success of the implant. A recent 5‑year radiostereometric analysis (RSA) cohort study evaluated tibial implant migration in 397 knees, comparing individuals with low versus normal bone mineral density (BMD) measured by dual‑energy X‑ray absorptiometry (DXA). The investigators sought to determine whether poorer bone quality translates into greater early‑stage movement of the tibial component, a surrogate marker for eventual aseptic loosening. The findings are reassuring for patients with osteopenia or even early osteoporosis: tibial migration did not differ significantly between the low‑BMD and normal‑BMD groups, regardless of whether the prosthesis was cemented or cementless. However, the study also notes wide confidence intervals and modest subgroup sizes, signalling the need for larger, longer‑term investigations. What This Study Examined Researchers measured pre‑operative BMD at the lumbar spine and hips, classified patients into low (T‑score ≤ –1.0) or normal groups, and tracked tibial component motion at baseline, 1‑year, 2‑year, and 5‑year intervals using RSA. The primary outcome was the 1‑year maximum total point motion (MTPM) between the two BMD groups. Secondary analyses explored the odds of continuous migration (MTPM > 0.2 mm between years 1 and 2) across the BMD spectrum. Why This Matters for Patients Implant migration is an early indicator of how well a prosthesis is fixing to bone. Excessive movement can precede aseptic loosening, the most common reason for revision surgery. By understanding whether low BMD predisposes to greater migration, surgeons can better tailor fixation methods (cemented vs. cementless) and postoperative counseling. Medical Background Knee arthritis—most often osteoarthritis—can cause debilitating pain and loss of function. When conservative measures fail, joint replacement offers reliable pain relief and improved mobility. In a TKA, the entire knee joint is replaced, whereas a UKA resurfaces only the damaged compartment, preserving more of the native knee. Bone mineral density reflects the amount of mineral—mainly calcium—in bone and is a key determinant of bone strength. Low BMD (osteopenia or osteoporosis) raises concerns that the bone may not provide a solid foundation for an implant, especially for cementless designs that rely on bone ingrowth (osseointegration) for stability. How the Procedure Works During a TKA, the surgeon removes damaged bone and cartilage from the femur, tibia, and sometimes the patella. Metal components—often cobalt‑chromium alloy—and a plastic (polyethylene) insert are cemented or press‑fit into the prepared bone surfaces. In a UKA, only the diseased compartment (medial or lateral) is resurfaced, preserving ligaments and the remaining joint surface. Cemented implants use bone cement (PMMA) to create an immediate mechanical bond. Cementless implants rely on porous or hydroxyapatite‑coated surfaces that allow bone to grow into the implant, providing long‑term biological fixation. Who Is a Candidate? Typical candidates include adults over 50 with end‑stage knee osteoarthritis who have exhausted non‑operative options such as physical therapy, injections, and bracing. For a UKA, the disease must be limited to a single compartment, with intact cruciate ligaments and a relatively straight mechanical axis. Bone quality is evaluated pre‑operatively; severe osteoporosis may steer the surgeon toward a cemented approach. Clinical Summary Procedure: Total or unicompartmental knee arthroplasty (cemented or cementless) Typical Duration: 45–90 minutes, depending on prosthesis type and patient anatomy Recovery: Hospital stay 1–3 days; physiotherapy begins day‑1; full activities usually resume within 3–6 months Success Rate (general): 90–95% survivorship at 10 years for modern implants Study Methodology This prospective cohort enrolled 397 patients undergoing primary TKA or UKA between 2014 and 2018 at a single high‑volume orthopedic center. Pre‑operative BMD was measured with DXA at the lumbar spine and hips, producing T‑scores used to dichotomize participants into low (≤ –1.0) or normal (> –1.0) groups. Patient Selection Criteria Adults ≥ 50 years undergoing primary TKA or UKA Availability of pre‑operative DXA scan No prior knee arthroplasty or revision surgery on the index knee Ability to attend follow‑up visits at 1, 2, and 5 years Outcome Measures Primary: 1‑year MTPM measured by RSA (mm) Secondary: Continuous migration defined as an increase > 0.2 mm between years 1 and 2; odds ratios (OR) calculated per unit increase in T‑score Safety: Recording of any revision, infection, or periprosthetic fracture during the 5‑year period Results & Findings Of the 397 knees, 210 received cementless implants (78 TKA, 132 UKA) and 187 received cemented implants (83 TKA, 104 UKA). The distribution of low versus normal BMD was balanced across groups. Key Outcomes Cementless TKA: Mean 1‑year MTPM difference between low and normal BMD = 0.15 mm (95 % CI –0.25 to 0.55) Cemented TKA: Mean difference = 0.12 mm (95 % CI –0.25 to 0.49) Cementless UKA: Mean difference = –0.21 mm (95 % CI –0.51 to 0.10) Cemented UKA: Mean difference = –0.15 mm (95 % CI –0.34 to 0.04) Odds of continuous migration per 1‑unit increase in T‑score: Cemented OR 0.94 (95 % CI 0.68–1.30); Cementless OR 0.79 (95 % CI 0.56–1.12) All confidence intervals crossed zero, indicating no statistically significant association between BMD category and early tibial migration for either fixation method. (Source: PubMed / Europe PMC) Complications & Risks The study reported standard postoperative complications—none were directly linked to BMD status. Recorded events across the cohort included: Periprosthetic infection (≈ 1 %); treated with debridement and, in some cases, implant exchange Early postoperative stiffness requiring manipulation under anesthesia (≈ 2 %) Periprosthetic fracture (rare; 10 years) outcomes still need confirmation. Standard postoperative precautions—weight‑bearing as instructed, adherence to physiotherapy, and regular follow‑up—remain the most important predictors of success. Patients should discuss with their surgeon whether a cemented or cementless implant is preferable for their individual bone health and lifestyle. Questions to ask your surgeon: Based on my DXA results, which fixation method (cemented vs. cementless) do you recommend? How will my bone health be monitored after surgery? What specific activities should I avoid during the first year to protect the implant? If I have osteoporosis, are there medical treatments that could improve my bone quality before or after surgery? What is the plan for long‑term follow‑up and imaging to detect early migration? Frequently Asked Questions Will low bone density increase the chance that my knee implant will loosen? According to the 5‑year RSA study, low BMD did not significantly raise early tibial migration, which is a surrogate for loosening. However, lifelong bone health and proper rehabilitation remain essential. Should I get a cemented or cementless knee replacement if I have osteopenia? The study showed no clear advantage of one fixation over the other based solely on BMD. Your surgeon will consider other factors like age, activity level, and overall bone quality when deciding. Is a DXA scan required before knee replacement surgery? While not mandatory for all patients, a DXA scan is useful in older adults or those with risk factors for osteoporosis to guide fixation choice and postoperative care. How is tibial implant migration measured, and why does it matter? Migration is measured with radiostereometric analysis (RSA), a precise imaging technique that detects tiny movements of the implant relative to bone. Early migration can predict later aseptic loosening. What can I do to improve my bone health after knee replacement? Engage in weight‑bearing exercise as approved by your surgeon, ensure adequate calcium and vitamin D intake, and consider pharmacologic therapy for osteoporosis if indicated. Related Articles Knee Flexion Contracture Treatment: A Guide to Femoral Anterior Distal Hemiepiphysiodesis

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