Displacement after Open vs Saw-Based Minimally Invasive Medial Displacement Calcaneal Osteotomy: A Cadaveric Study

Area of Science:

• Orthopedic Surgery
• Foot and Ankle Surgery
• Surgical Techniques

Background:

• Medial displacement calcaneal osteotomy (MDCO) is a standard procedure for correcting hindfoot valgus.
• Minimally invasive surgery (MIS) offers potential advantages over traditional open techniques.
• Previous reports suggest MIS calcaneal osteotomies are comparable in safety and efficacy to open methods.

Purpose of the Study:

• To compare the medial tuberosity displacement achieved by fine-cut saw-based MIS versus open MDCO techniques.
• To evaluate the efficacy of MIS in achieving calcaneal displacement relevant to hindfoot realignment.

Main Methods:

• A cadaveric study involving eight matched specimens.
• Each specimen underwent both open and MIS MDCO on contralateral limbs.
• Measurements of medial displacement were taken manually and radiographically.

Main Results:

• Manual measurements: MIS 7.9 mm vs. Open 8.7 mm (P=.36).
• Radiographic measurements: MIS 7.1 mm vs. Open 7.4 mm (P=.83).
• No statistically significant difference in medial displacement between MIS and open MDCO.

Conclusions:

• Fine-cut saw-based MIS and open MDCO techniques yield comparable calcaneal tuberosity displacement in a cadaveric model.
• This suggests MIS is a viable alternative for hindfoot valgus correction.
• Further clinical studies may validate these findings in patient populations.