Patient-Specific Guide Assembly for Articular Bone Loss Repair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing orthopaedic procedures face challenges in accurately determining and addressing bone loss along articular surfaces, particularly in the glenoid, leading to joint instability and pain, with inadequate methods for precise bone graft placement and joint restoration.
Innovation Solution
A planning system and instrumentation are developed to determine bone loss, including a guide assembly with patient-specific contours and resection planes, and a computing device for precise bone graft placement using a Latarjet procedure, utilizing a shell assembly and outrigger for coracoid process harvesting and graft positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional orthopaedic procedures are used for bone loss repair, then the procedure can be performed with standard instrumentation, but the precision of bone graft placement and joint restoration is insufficient
Solution Approach 1:
The guide assembly is divided into multiple components: a shell component, an outrigger component, and a bone graft component. Each component serves a specific function - the shell provides structural support and defines the bone loss cavity, the outrigger extends to contact the articular surface for positioning, and the bone graft component contains the actual graft material. This segmentation allows for precise placement while keeping each individual component relatively simple to manufacture.
Solution Approach 2:
The guide assembly is designed to be positioned and secured to the bone surface before the bone graft placement procedure. The shell and outrigger establish predetermined resection planes and capture the bone loss cavity in advance, creating a prepared framework that guides subsequent graft insertion. This preliminary positioning ensures that when the bone graft is placed, it automatically achieves the correct position and orientation without requiring complex real-time adjustments.
2Measurement precision
If standard surgical methods are used, then the procedure is simpler to perform, but the ability to accurately determine and address bone loss along articular surfaces is inadequate
Solution Approach 1:
The guide assembly is designed with patient-specific contours that match the unique geometry of the individual patient's bone loss cavity. The shell component is customized to conform to the specific shape and size of the bone defect, while the outrigger is configured to contact the specific articular surface landmarks relevant to that patient. This local customization allows for highly accurate determination of bone loss dimensions and precise addressing of the specific defect without requiring complex universal measurement procedures.
Solution Approach 2:
The guide assembly creates a physical copy or replica of the patient's bone loss cavity through the shell component, which is dimensioned to capture the cavity's geometry. This copied geometry is then used as a template to guide bone graft placement, ensuring that the graft perfectly matches the defect shape and size. This copying approach simplifies the measurement process by translating complex anatomical measurements into a ready-to-use physical model.
3Reliability
If bone graft placement is performed without patient-specific guidance, then the procedure is faster to set up, but the restoration of joint functionality and stability is compromised
Solution Approach 1:
The guide assembly serves as an intermediary device between the surgeon and the bone graft placement process. Rather than requiring the surgeon to directly measure and position the graft without aid, the guide assembly mediates this process by providing predetermined resection planes, capturing the bone loss cavity, and guiding graft insertion. The shell and outrigger act as intermediary structures that translate surgical intent into precise physical guidance, improving reliability while keeping the actual surgical steps relatively simple.
Data Source
AI summary
This disclosure relates to planning systems, methods and instrumentation. The planning systems, methods and instrumentation disclosed herein may be utilized for planning orthopaedic procedures to restore functionality to a joint, may include determining an amount of bone loss along or otherwise adjacent to an articular surface of a bone. Instrumentation may be formed based on one or more dimensions associated with the bone loss. The articular surface may be repaired, which may include utilizing the instrumentation and planning systems to position and secure a bone graft along a position of the bone associated with the bone loss.