The frictional engagement of each graft ligament is temporally spaced apart from {HEAD ~ the frictional engagement} of {TAIL ~ at least one other graft ligament} 
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The frictional engagement of each graft ligament is temporally spaced apart from { HEAD ~ the frictional engagement } of { TAIL ~ at least one other graft ligament }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL