An Assessment of Two Accelerated Rehabilitation Programs for Use With the InSpaceTM Subacromial Tissue Spacer System in the Treatment of Full-thickness Massive, Irreparable Rotator Cuff Tears

Inclusion Criteria: Subjects MUST meet ALL the following criteria to be included in the study: * The subject has signed the IRB approved Informed Consent Form (ICF) specific to this study prior to enrollment * Is male or female ≥ sixty-five (65) years of age * Positive diagnostic imaging by MRI within 9 months of enrollment of the index shoulder indicating a full thickness MRCT: * Measuring ≥ 5 cm in diameter * Involving ≥ two tendons * Functional deltoid muscle and preserved passive range of motion on physical examination * Documented VAS score \> 30 mm pain * Failed non-operative trea…