An in vivo study of locking and grasping techniques using a passive mobilization protocol in experimental animals

An in vivo experimental study was performed on the flexor profundus tendons of adult canines to determine tensile strength differences between locking and grasping technique repairs and to document the tensile strength using a passive mobilization protocol through the first 21 days following surgery. Forty experimental third and fourth flexor tendons of the right forepaws were lacerated and repaired with either of the 2 techniques. The experimental tendons were harvested at days 3, 7, 14, and 21 and were biomechanically tested. The third and fourth profundus tendons of the left forepaws were used as control (day 0) tendons; they were lacerated and repaired with the locking or grasping techniques at the time of harvest and also were biomechanically tested. The locking technique statistically improved tensile strength values at days 0, 3, and 21. The tensile strength decrease was minimal when using a passive mobilization protocol after surgery.