Low inter- and intraobserver variability allows for reliable tunnel measurement in ACL reconstruction using the...

Area of Science:

• Orthopedic surgery
• Radiology
• Biomechanical analysis

Background:

• Accurate tunnel placement is critical for successful anterior cruciate ligament (ACL) reconstruction outcomes.
• Radiological methods like the quadrant method are used to assess tunnel positioning.
• Reliability of measurement methods must be validated for consistent clinical application.

Purpose of the Study:

• To determine the reliability of the quadrant method for measuring tunnel positions in ACL reconstruction.
• To evaluate the inter- and intraobserver variability of the quadrant method.

Main Methods:

• Twenty knee surgeons assessed tunnel positions on five lateral radiographs using the quadrant method in a test/retest design.
• Measurements included quadrant dimensions, rotation, angle deviation, and tunnel positions.
• Statistical analysis calculated mean deviations, standard deviations, and ranges for inter- and intraobserver variability.

Main Results:

• The quadrant method demonstrated low interobserver variability, with mean variability under 1 mm (range 2.5-3.7 mm).
• Intraobserver analysis also showed low variability, with mean deviations under 1 mm and maximum standard deviations of 0.7 mm (range up to 2.3 mm).

Conclusions:

• The quadrant method exhibits low inter- and intraobserver variability, confirming its reliability.
• The quadrant method is recommended for radiographically describing ACL insertion areas and determining tunnel positions intraoperatively and postoperatively.