Partial Knee Implant Alignment Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current partial knee replacement surgeries, such as Unicompartmental-knee arthroplasty (UKA), face challenges in achieving optimal bone resection and implant alignment, leading to inconsistent outcomes and prolonged recovery times due to inadequate surgical techniques and poorly designed implants.
Innovation Solution
A surgical approach that involves a tibial cut in flexion, followed by proximal tibial resection in extension, using an alignment system and modular sliding resection guide blocks to balance the knee gap, ensuring minimal bone removal and precise implant placement with the aid of femoral and tibial preparation guides for accurate resection and peg hole creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional total knee replacement is performed, then complete knee joint replacement is achieved, but more bone is removed and trauma is increased
Solution Approach 1:
The patent extracts only the damaged compartment of the knee joint for replacement, leaving the healthy compartments intact. This partial replacement approach removes minimal bone while addressing the specific arthritic damage, directly resolving the contradiction between achieving reliable knee replacement and minimizing bone loss.
Solution Approach 2:
The knee joint is segmented into separate compartments (medial, lateral, patellofemoral), and only the affected compartment is replaced. This segmentation allows targeted treatment that maintains healthy bone and tissue, reducing overall trauma while ensuring reliable replacement of the damaged area.
2Reliability
If UKA was initially performed with poorly designed implants, then partial knee replacement was attempted, but implant success rate was low
Solution Approach 1:
The implant design incorporates dynamic elements including adjustable positioning features and adaptable fixation mechanisms that allow the implant to accommodate varying anatomical conditions. This dynamic design capability significantly improved UKA success rates by enabling precise customization for each patient's specific anatomy and pathology.
Solution Approach 2:
The patent utilizes parameter changes in implant geometry, material properties, and fixation characteristics to optimize performance. By varying these parameters based on specific patient needs and anatomical measurements, the implant reliability was dramatically improved while managing design complexity through systematic parameter optimization.
3Reliability
If precise bone resection and implant alignment are achieved, then post-operative stability is improved, but surgical technique complexity increases
Solution Approach 1:
The surgical technique employs preliminary action through pre-operative planning, pre-positioning of guides and jigs, and preliminary bone preparation steps that establish accurate alignment before final implant placement. This preliminary structuring of the surgical process achieves precise resection and alignment while reducing intraoperative complexity and improving post-operative stability.
Solution Approach 2:
The patent introduces intermediary tools such as alignment guides, positioning jigs, and trial components that mediate between the surgeon's actions and the final implant placement. These intermediaries simplify the surgical technique by providing mechanical guidance for precise bone resection and implant alignment, thereby improving post-operative stability without significantly increasing surgical complexity.
Data Source
AI summary
The present disclosure is a femoral preparation guide and a kit of surgical components related to the femoral preparation guide. The femoral preparation guide is for use on a condyle of a femur during a surgical procedure in which the condyle receives a femoral condylar implant. The femoral preparation guide includes a posterior portion for fitting over a posterior region of the condyle and a distal portion for fitting over a distal region of the condyle. The distal portion is at an angle relative to the posterior portion. The distal portion includes first and second resections slots for receiving cutting tools that provide two resections of the condyle. The first and second resections slots being at angles relative to each other.