The Effects of Bone Health on Landing Mechanics on Patients Post ACL Reconstruction.

Group 1 - ACL without BFR : 30 athletes with ACL tears and will NOT do blood flow restriction (BFR). Random group allocation will be determined using envelopes for allocation concealment. The control group will be tested with a Dexascan immediately post appointment confirming MRI findings of ACL tear and scheduling surgery. They will be then Scanned again at first therapy appointment within 24-48 hours of surgery. Then Dexascans will be done every 4 weeks until 28 weeks with a maximum of 9 scans. The scans will be completed on a normally scheduled rehabilitation session at the convenience of the radiology techs availability. The investigators will collect force plate measurements for squat symmetry at first 4-week assessment period, and then for landing symmetry every 4 weeks after that until 28 weeks.

Group 2 - ACL with BFR: 30 athletes with ACL tear that will receive BFR. This group will be selected in the same manner as the control group. They will be tested with a dexasan immediately post appointment confirming MRI findings of ACL tear and scheduling surgery. At the initial dexascan they will also be instructed in Blood flow restriction and do exercises with blood flow restriction to prepare for initial post-surgical visit. They will be then scanned again at first therapy appointment within 24-48 hours of surgery. Then Dexascans will be done every 4 weeks until 28 weeks with a maximum of 9 scans. The investigators will collect force plate measurements for squat symmetry at first 4-week assessment and then for landing symmetry every 4 weeks after that until 28 weeks.

The standard of care following ACL tear does not include Dexascan, force plate measurements, or blood flow restriction.

Independent Variable

1. Blood Flow Restrictions (BFR) Dependent Variable