Background: Post-operative hip dislocation has been commonly associated with primary THA as a troublesome complication after posterior approach. Although several other risk factors have been implicated, techniques of capsular repair and closure have also been described. A new technique for repair of the capsule after posterior, minimally invasive, total hip arthroplasty is described. Methods: In Part A of this two-part study, 133 classic repairs of the capsule and external rotators to the greater trochanter (Group 1) were retrospectively compared to 144 capsular noose repairs (Group 2). After minimum 24-month follow up, dislocation was more common in Group 1 than in Group 2 (5.3% vs. 0.69%, p = 0.02). In Part B, 20 consecutive patients were tested intra-operatively for torque and internal rotation to dislocation using three capsular repair techniques. Results: The capsular noose repair provided greater resistance to dislocation than no repair (p < 0.01) and to simulated classic repair (p < 0.05). Conclusion: The capsular noose repair may reduce dislocation risk after posterior approach total hip arthroplasty. Highlights: