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A guide instrument for high tibial osteotomy.
S Odenbring1, N Egund, A Lindstrand
1Lund University Department of Orthopedics, Sweden.
Acta Orthopaedica Scandinavica
|August 1, 1989
Summary
High tibial osteotomy using the Tjörnstrand guide instrument significantly improved correction accuracy for medial gonarthrosis. This surgical guide enhances precision in knee osteotomies compared to freehand techniques.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
Background:
- Medial gonarthrosis (knee osteoarthritis) significantly impacts joint function.
- Traditional freehand high tibial osteotomy techniques have shown variable correction accuracy.
Purpose of the Study:
- To evaluate the efficacy of the Tjörnstrand guide instrument in achieving accurate correction during high tibial osteotomy for medial gonarthrosis.
- To compare the precision of guided osteotomy with previous freehand methods.
Main Methods:
- Fifty-two patients with medial gonarthrosis underwent high tibial osteotomy using the Tjörnstrand guide.
- Preoperative lower limb radiographs were used to calculate the intended surgical wedge.
- The correction aimed for a 4-degree valgus overcorrection of the hip-knee-ankle angle.
Main Results:
- 98% of cases achieved correction within +/- 3 degrees of the intended hip-knee-ankle angle.
- 96% of cases healed within +/- 3 degrees of the achieved surgical correction.
- This represents a substantial improvement over the 20% inaccuracy observed with the freehand technique.
Conclusions:
- The Tjörnstrand guide instrument significantly enhances the accuracy of high tibial osteotomy for medial gonarthrosis.
- Surgical guides are crucial for achieving precise outcomes in knee osteotomies, comparable to their importance in arthroplasties.