2017 ISAKOS Biennial Congress ePoster #1105

 

What Is Our Slope? An MRI Based Double Blinded Observational Study of Posterior Population in the Asian Race

Sarthak Patnaik, MS, FASM(ISAKOS), FHA, Prof, Bhubaneswar, Odisha INDIA
Shyam Sundar, MS ORTHOPAEDICS, Coimbatore , Tamilnadu INDIA
Bobur Sabirovich Ubaydullaev, MD, Tashkent UZBEKISTAN
David V. Rajan, MS(Orth), MNAMS(Orth), FRCS(G), Coimbatore, Tamil Nadu INDIA

Ortho one Orthopaedic Specialty Centre, Coimbatore , Tamil Nadu , INDIA

FDA Status Not Applicable

Summary

Considering tibial slope as an important factor in ACL injury may be inappropriate.

Abstract

Background

:Posterior tibial slope is considered as an important non modifiable factor which may determine the risk of ACL injury. But not enough studies been done in the Indian population with respect to the posterior tibial slope and no clear cut value been demonstrated beyond which the risk of ACL injury may be high.

Purpose

:The purpose of this study is to determine if there is a difference in posterior tibial slope angle between patients with ACL injury and a control group with intact ACL in Indian population . The secondary objective was to assess the differences in tibial slope angle between male and female population within each group as well as to propose the normal range of tibial slope in indian population.

Methodology

:This is an MRI based observational study done in total of 489 knees out of which 290 patients had intact ACL and remaining 199 had ACL deficiency.

Results

:The mean MTS in ACL intact and deficient knees were 6.73°± 2.73 and 6.72°±2.72 respectively, whereas the mean LTS in ACL intact and deficient knees were 5.70°±3.23 and 5.68°±3.23 respectively. Mean medial tibial depth(MTD) in ACL intact and ACL deficient group were 1.73 ± 1.012 mm and 1.74 ± 1.011 mm respectively. Mean lateral tibial height (LTH) in ACL intact and ACL deficient group were 2.22 ± 0.79 mm and 2.21 ± 0.79 mm respectively. Datas reveal no significant difference in the slope values in both groups as well between the genders.

Conclusion

This study reveals no difference in tibial slope and tibial depth between ACL injured and ACL intact population. There seems to be no difference in the tibial slope between male and female population as well. Hence considering the tibial slope alone as an important risk factor in ACL injury may be inappropriate and several other external factors in combination with the tibial slope may contribute to increased susceptibility to ACL injury. In addition , considering the large sample size , we can conclude that the normal range of tibia slope in Indian population is between 5° to 8°.