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Usefulness of an accelerometer-based portable navigation system in total knee arthroplasty
T Ikawa1, S Takemura1, M Kim2
1Saiseikai Nakatsu Hospital Osaka, 2-10-39, Shibata, Kita-ku, Osaka 530-0012, Japan.
The Bone & Joint Journal
|August 4, 2017
Summary
The KneeAlign2 system improved femoral component alignment and reduced blood loss in total knee arthroplasty compared to traditional methods. This navigation system offers a more accurate and efficient surgical outcome.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Surgical Navigation Technology
Background:
- Total knee arthroplasty (TKA) aims to restore knee function and alignment.
- Accurate femoral component placement is crucial for TKA success.
- Conventional intramedullary guides may have limitations in achieving optimal alignment.
Purpose of the Study:
- To evaluate the efficacy of the KneeAlign2 system in TKA.
- To assess the impact of KneeAlign2 on femoral component alignment.
- To determine the effect of KneeAlign2 on intraoperative blood loss.
Main Methods:
- A prospective, randomized controlled study involving 241 patients with knee osteoarthritis.
- Patients were divided into two groups: KneeAlign2 (KA2) system for distal femoral resection (n=121) and conventional intramedullary (IM) guide (n=120).
- Femoral component alignment and blood loss were measured and compared between groups.
Main Results:
- Significantly fewer patients in the KA2 group had alignment deviations greater than 3° from the neutral mechanical axis (0.8% vs. 15.8%, p < 0.01).
- The mean deviation from neutral alignment was lower in the KA2 group (1.01° vs. 1.93°, p < 0.01).
- Blood loss was significantly reduced in the KA2 group compared to the IM group (784 ml vs. 1071 ml, p < 0.001).
Conclusions:
- The KneeAlign2 system is a straightforward method for accurate distal femoral resection in TKA.
- It significantly improves femoral component alignment compared to conventional intramedullary guides.
- The use of KneeAlign2 leads to substantially less blood loss during TKA procedures.
