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Transtibial Repair of Lateral Meniscus Posterior Root Tears Improves Contact Biomechanics in Pediatric Cadavers
Anshal Gupta1, Mark Sanchez1, Hunter W Storaci1
1Department of Orthopedic Surgery, Stanford University, Stanford, California, U.S.A.
Insights
Pediatric lateral meniscus root tears decrease knee contact area and increase pressure. Repairing these tears improves contact area and pressure, restoring knee function in children.
Area of Science:
- Orthopedic biomechanics
- Pediatric knee injuries
- Meniscal tear research
Background:
- Limited data exists on treating pediatric lateral meniscus root tears (LMPRTs).
- Understanding the biomechanical impact of LMPRTs and their repair is crucial for pediatric knee health.
Purpose of the Study:
- To biomechanically characterize pediatric lateral knee joints after LMPRT and subsequent root repair.
- To test hypotheses regarding changes in tibiofemoral contact area and pressure.
Main Methods:
- Eight pediatric cadaver knees (ages 8-12) were tested for lateral compartment contact.
- Tekscan sensors measured contact area and pressure under intact, torn, and repaired (transtibial pullout sutures) lateral meniscus conditions.
- Testing occurred at 0°, 30°, and 60° flexion using robotic loading.
Main Results:
- LMPRT significantly decreased mean contact area at 30° and 60° flexion.
- Root repair increased mean contact area, approaching intact meniscus values.
- Contact pressure differences were not statistically significant, though repair influenced pressure at different flexion angles.
Conclusions:
- Pediatric LMPRTs reduce lateral tibiofemoral contact area and alter contact pressures.
- Transtibial pullout repair of pediatric LMPRTs enhances tibiofemoral contact area at higher flexion and improves contact pressures at lower flexion.
Purpose:
A paucity of data exists on the treatment of pediatric lateral meniscus root tears (LMPRTs). This study aims to characterize the biomechanics of the lateral knee joint in pediatric cadavers following LMPRT and root repair. Our hypotheses were: (1) compared with the intact state, LMPRT would be associated with decreased contact area; (2) compared with the intact state, LMPRT would be associated with increased contact pressures; and (3) compared with LMPRT, root repair would restore contact area and pressures toward intact meniscus values.
Methods:
Eight cadaver knees (ages 8-12 years) underwent contact area and pressure testing of the lateral compartment. Tekscan pressure mapping sensors covering the tibial plateau were inserted underneath the lateral meniscus. Appropriate pressure load equivalents were applied by a robot at degrees of flexion: 0, 30, 60. Three meniscus conditions were tested: (1) intact, (2) complete root tear, and (3) repaired root tear. Root repairs were performed with transtibial pullout sutures. Statistical analysis was performed.
Results:
Root tear significantly decreased mean contact area at 30° (P = .0279) and 60° (P = .0397). Root repair increased mean contact area and did not significantly differ from intact states. Differences in contact pressures between meniscus states were not statistically significant. Relative to the intact state. the greatest increase in contact pressures occurred between 0° and 30°. Root repair decreased mean contact pressures at 0° and 30°. At 60°, mean contact pressures of the repair state were closer in magnitude to the tear state than the intact state. Conclusions: LMPRT decreases contact area and increases contact pressures in the lateral knee compartment. Repair of LMPRT improves tibiofemoral contact area at high (>30°) degrees of flexion and contact pressures at low (<30°) degrees of flexion.
Clinical Relevance:
Transosseous pullout repair is a clinically validated treatment for LMPRT. This study provides baseline biomechanics data of transtibial pullout repair of pediatric LMPRTs.
