J Med Assoc Thai 2003; 86 (3):282

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A Knee Model for Arthrocentesis Simulation
Waikakul S Mail, Vanadurongwan B , BSc WC , Assawamongkolgul A , Chotivichit MA , Rojanawanich MV

Objectives
: To produce a knee model for medical students and residents to practice knee
aspiration and intra-articular injection.
Material and Method
: The model was made of plastic, rubber and silicone that included
the lower third of the femur, the upper third of the tibia and the patella. They were fixed on 2 plastic
boxes in the anatomical position and the boxes were connected together with 2 small hinge joints. A
rubber bag was made in the pattern of synovial space of the knee. Quadriceps, anterior muscles of the
leg and patellar tendon were also presented. The model was covered with silicon sheet, representing
the skin. Water was used to fill up the synovial bag to simulate joint aspiration
via
supero-lateral
approach with the knee in extension. The model was appraised by 30 medical students, 26 orthopedic
residents and 10 orthopedic staff in terms of size, anatomy, physical examination, feeling during
aspiration, need of the model in education and commercial use.
Results
: Most of the medical students, residents and staff (80-90%) were satisfied with the
model and rated it as good to very good teaching media. However, the model should come out in dif-
ferent sizes and the synovial bag should be modified to improve the ballotment test. Mass production
of the model should be done.
Conclusion
: The knee model is an acceptable teaching model for arthrocentesis simulation
with affordable cost.
Key word
: Medical Education, Arthrocentesis, Knee Model

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