7/20/21, 3:29 AM
Expect Kamara to pick up where he left off as a top RB in 2021. His short-term durability risk is low, be he carries significant long-term concerns.
2019 - high ankle sprain, knee sprain (~Week 5; 2 games missed)
2017 - concussion (week 14; returned following game)
2016 - left knee (LCL sprain, meniscus tear), treated with surgery (returned in 4 weeks)
2012 - knee injury, treated with surgery (missed 3-4 weeks of practice; ultimately red-shirted)
2017 - 16/16
2018 - 15/16
2019 - 14/16
2020 - 15/16
Kamara should be starting the season healthy with no change from his prior performance trajectory.
Kamara has been consistent (playing 14+ games/year) since entering the NFL, but does have substantial durability concerns related to reports of prior knee surgeries in 2012 and 2016. (Kamara has publicly denied having undergone these procedures, but our assessment is nevertheless based on the best available reporting.)
He tore his meniscus (shock-absorber) in his left knee in 2016 and returned in 4 weeks, which tells us that the torn piece was probably removed, rather than repaired. He had a knee scope (surgery using a camera in the knee through small incisions) in 2012, but the only public details are that he would’ve been able to return in 3-4 weeks. This surgery could have been done for multiple different reasons, but even without further information, data already makes us cautious about his outlook.
NFL studies demonstrate that players entering the league with similar knee injury histories ended up having shorter careers and fewer games played (5.6 vs 7 years, 62 vs 85 games) than their peers. It also puts him at higher risk of developing an injury to the knee cartilage (which lines and protects the bones), which data strongly indicate lead to decreased productivity (think Todd Gurley). That situation is probably not developing yet, so concern for 2021 is low. We would, however, have second thoughts about committing to Kamara for more than 2-3 years.
Image Source: Tammy Anthony Baker, CC-BY-2.0