Experimental Repair of Rotator Cuff Rupture in the Dog:Biomechanical Study of Cuff Insertion

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The healing process of repaired tendon insertion of rotator cuff was studied biomechanically up to 24 weeks after operation. The right supraspinatus tendons of twenty-one adult mongrel dogs were repaired by tendon suturing to bone. The left shoulder of each animal was designated as sham operated control. Other 5 dogs without having surgical procedures were designated as normal controls.Tensile testing to failure was performed with supraspinatus tendon-bone units under low strainrate conditions. The major mode of failure changed from avulsion failure at 6-12 weeks to tendon disruption at 24 weeks. With the lapse of time, tendon-bone units showed higher maximum load to failure, higher stiffness, higher load failure energy, though mean values of these three parameters reached only 70%-85% of those of controls at 24 weeks.