Autograft type affects muscle strength and hop performance a
A Study was conducted to evaluate and compare changes in quadriceps and hamstring strength and single-leg-hop (SLH) test performance over the first 24 postoperative months in patients who underwent anterior cruciate ligament reconstruction (ACLR) with bone-patellar tendon-bone (BPTB) or hamstring tendon (HT) autografts and followed either a standard or an accelerated rehabilitation protocol.

A total of 160 patients undergoing ACLR were randomised in four groups depending on the graft that was used and the rehabilitation protocol. Isokinetic concentric quadriceps and hamstring strength at 90°/s and the SLH test performance were assessed preoperatively and 4,6,8,12 and 24 months postoperatively.

Results:
--An average quadriceps strength LSI of 78.4% was found preoperatively.

--After ACLR, the LSI first decreased at 4 months and then increased from 6 to 24 months, reaching an overall value of 92.7% at the latest follow-up.

--The BPTB group showed a significantly decreased LSI at 4, 6, 8 and 12 months compared with the HT group.

--After ACLR, the LSI increased from 4 to 24 months in the BTPB group.

--In the HT group, the LSI first decreased at 4 months and then increased from 6 to 24 months.

--The BPTB group showed a significantly decreased LSI only at 4 months postoperatively compared with the HT group.

Conclusively, Muscle strength and SLH test performance recovered progressively after ACLR overall, but they did not all fully recover, as the injured leg performed on average less than 100% compared with the uninjured leg even 24 months postoperatively. After ACLR, inferior quadriceps strength and a poorer SLH test performance were found at 4, 6, 8 and 12 months and at 4 months, respectively, for the BTPB group compared with the HT group. Persistent, inferior hamstring strength was found at all postoperative follow-ups in the HT group.

Source: https://link.springer.com/article/10.1007/s00167-020-06334-5
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