A Rare Case of Lateral Femoral Condyle Osteonecrosis of Knee in a Young Patient Treated with Robotic Total Knee Replacement: A Case Report
Authors: K T Rajashekhar et al. (2025)
Link: https://pubmed.ncbi.nlm.nih.gov/40520727/
Background Information:
Osteonecrosis (bone death from poor blood supply) of the femoral condyle in the knee is rare, especially in younger people. It typically affects older women and most often occurs on the inner (medial) side of the knee. When it occurs in young folks, especially teenagers, it’s exceptionally rare and surprising. When the bone collapses, it can lead to severe osteoarthritis and joint pain.
Purpose of the Study:
Total knee replacement (TKA), a strategy typically reserve for much older patients. This case report aimed to describe the rare occurrence of osteonecrosis in the lateral femoral condyle of a 17-year-old male’s knee and explain why the surgical team decided on robotic-assisted total knee replacement (TKA) as the treatment option.
Methods and Data Analysis:
The authors detail the patient’s history and symptoms—left knee pain, difficulty walking, squatting, and sitting cross-legged difficult. Through clinical examination and X-rays, CT, and MRI, they confirmed bone death and early arthritis in the lateral femoral condyle extending into the trochlea. After detailed counseling, the team chose a robotic-assisted TKA for high precision in implant placement and optimal leg alignment. The report includes imaging before and after surgery, along with intraoperative photos showing findings such as cartilage fissuring and necrosis.
Key Findings and Conclusions:
Postoperative X-rays at three months showed well-positioned implants with correct alignment. More importantly, the patient regained function: walking, squatting, and even sitting cross-legged pain-free seemed possible again. It appears that when young patients have extensive joint damage, conservative or bone-preserving techniques might fall short. In this case, robotic TKA offered a way to restore mobility and quality of life—even though replacement is usually a last-resort in someone so young. The robotic approach may also add technical advantages over manual knee replacement. The report concludes that in rare cases of severe osteonecrosis in young patients, joint-preserving treatments aren’t enough. Robotic-assisted TKA, though unconventional for a 17-year-old, can restore function and quality of life when extensive damage is present. The precision of robotic surgery may also improve outcomes over manual techniques.
Applications & Limitations:
This case emphasizes the importance of personalized treatment planning even in teens. While joint preservation is usually preferred for younger patients, advanced bone damage may necessitate total joint replacement. If damage is extensive, joint replacement (with robotic assistance) might be the only realistic fix. Robotic TKA offers precise implant placement and alignment, which can enhance functional outcomes in complex cases. However, It’s just one patient, so it’s not proof that every teenager with knee osteonecrosis should get a TKA. We don’t know how well the implant will hold up over decades- someone who’s 17 has a lot of life left with that artificial joint. The case doesn’t compare robotic TKA to other options like osteotomies or other bone-preserving treatments. There's a lack of long-term outcome data.