Summary: Proximal Femoral malrotation correction frequently successfully resolves hip impingement even in the presence of intra-articular CAM/pincer pathomorphology.

Introduction.
It is recognised that hip impingement can be caused by intra-articular pathology (CAM/pincer) and/or a combined femoral/acetabular version abnormality. The latter is treated based on the severity of predominant component. Proximal Femoral (PF) malrotation treatment includes Proximal Femoral Derotation Osteotomy (PFDO). We aimed to determine PFDO clinical effectiveness in patients with hip symptoms.

Materials.
A review of patients undergoing PFDO between 2018-2020. Sub-trochanteric PFDO was routinely stabilised with IM nail (Metatan,S&N). We reviewed our management of femoral torsion and associated MRI-defined intra-articular pathomorphology: CAM/pincer ? labral tear and non-CAM/pincer-related labral tears. Combined femoral/acetabular version was assessed using McKibbin Index (MI) (normal ranges: MI–20-50o, acetabular version–10-25o, PF–10-25o). If presenting symptoms resolved, patients were discharged at 18months.

Results.
22 patients underwent PFDO for hip pain. Average age–24years (17-38), average follow-up–20months (3-36).

Observed prevalence of version abnormalities in our cohort were:
• MI
o 8–Excessive retroversion (range -5–5o,median–3o),
o 14–Excessive anteversion (51–67o,median–55o);
• Acetabulum
o 11–Relative retroversion (-2–9o,median–4o),
o 11–Normal (11–23o,median–19o);
• PF
o 8–Relative retroversion (-8–5o,median–0o),
o 14–Excessive anteversion (26–54o,median–34o).

Overall, 12 patients settled post-PFDO and were discharged at 18months follow-up.

Of 10 patients with associated MRI-defined CAM/pincer pathomorphology
• 4 had hip arthroscopy prior to PFDO (discharged)
• 1 required hip arthroscopy post-PFDO
• 5 – no hip arthroscopy required (2–discharged, 3– <18months follow-up).

Conclusion.
Patients with hip impingement present with high prevalence of rotational malalignment. Hip arthroscopy for intra-articular pathology prior to malrotation correction is likely to fail. Primary correction of malrotation is crucial and leads to symptom resolution in significant proportion of patients.

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Can Hip Pain Be Treated With Tibial Malrotation Correction? Abstract Presentation 5 minutes Vitali Goriainov, FRCS (Orth), BM, PhD, MSc, UNITED KINGDOM Mohamed Zubair Farook, MBBS, D.Ortho, FRCS (Orth), UNITED KINGDOM Rajiv Kaila, MRCS, MSc, MFSEM(UK), FEBOT, UNITED KINGDOM Tom CB Pollard, MD, FRCS (Tr & Orth), UNITED KINGDOM Antonio J. M. D. Andrade, MB BS, M.Sc., FRCS(Tr&Orth), UNITED KINGDOM
Female Athletes Demonstrate Greater Improvement in Patient Reported Outcome Scores and Equal Return To Sport Rates Compared to Males After Hip Arthroscopy A Gender Based Matched Comparison of High-Level Athletes Abstract Presentation 4 minutes Andrew Jimenez, MD, UNITED STATES Rachel Glein, BS, UNITED STATES Kara Miecznikowski, BS, UNITED STATES Benjamin Saks, MD, UNITED STATES Hari Krishna Ankem, MD, UNITED STATES Payam William Sabetian, MD, GUATEMALA Benjamin G. Domb, MD, UNITED STATES
Outcome Measures After Proximal Hamstring Repair: A Systematic Review ePoster Presentation Tara Reza, MPH, UNITED STATES Andre Gordon Perez-Chaumont, BS, UNITED STATES Andrew J Hinkle, BS, UNITED STATES Symone M Brown, MPH, UNITED STATES Mary K. Mulcahey, MD, UNITED STATES
Total Hip Arthroplasty (THA) after Previous Hip Arthroscopy: A Mid-Term Functional and Clinical Comparison with Index THA Abstract Presentation 5 minutes Kelsi Greenwood, BScHons, SOUTH AFRICA Jurek R. T. Pietrzak, MBBCh, FCS(SA)Orth, UNITED KINGDOM Zia Maharaj, MBChB(Pret), SOUTH AFRICA Josip N. Cakic, MD, PhD, FCS(SA)Orth, MMed(Orth)WITS, SOUTH AFRICA
Segmental Labral Reconstruction With A Polyurethane Scaffold: Assessment Of Femoro-Acetabular Contact Mechanics Abstract Presentation 5 minutes Bruno Capurro, MD, PhD., SPAIN Marc Tey, MD, PhD., SPAIN Francisco Reina, MD, PhD, SPAIN Anna Carrera, MD, PhD., SPAIN Mauricio Gidi, MD, SPAIN Joan Carles Monllau, MD, PhD, Prof., SPAIN
Hip Arthroscopic Portals:A New Approach Through Accessory Portals Established Within 3Cm Around Anterolateral Portal ePoster Presentation Kiran Kumar Shah, MD, NEPAL
Endoscopic Iliotibial Band Release During Hip Arthroscopy For Femoroacetabular Impingement Syndrome And External Snapping Hip Had Better Patient-Reported Outcomes: A Retrospective Comparative Study Abstract Presentation 5 minutes Chunbao Li, MD, PhD, CHINA Shanxing Zhang, MD, CHINA
Health Literacy in Hip Arthroscopy: A Quantitative Assessment of the Understandability and Readability of Online Patient Education ePoster Presentation Alan Shamrock, MD, UNITED STATES Burke Gao, MD, UNITED STATES Olivia O'Reilly, MD, UNITED STATES Mary Kate Skalitzky, BA, UNITED STATES Trevor Gulbrandsen, MD, UNITED STATES Michael C. Willey, MD, UNITED STATES Robert W. Westermann, MD, UNITED STATES
Outcomes Of Revision Hip Arthroscopy Are Unaffected By Intraoperative Findings: A Matched Cohort Study ePoster Presentation Hari Krishna Ankem, MD, UNITED STATES Samantha Diulus, BS, UNITED STATES Cynthia Kyin, BA, UNITED STATES Jacob Shapira, MD, UNITED STATES Philip Joseph Rosinsky, MD, UNITED STATES Mitchell Meghpara, MD, UNITED STATES Ajay C. Lall, MD, MS, FAAOS, UNITED STATES Benjamin G. Domb, MD, UNITED STATES
Assessing Risk Of Osteonecrosis Of The Hip Following Intraarticular Injections: Hyaluronic Acid Versus Corticosteroid Abstract Presentation 5 minutes Nathan Varady, MD, MBA, UNITED STATES Ahab Chopra, BA, UNITED STATES Paul F Abraham, BS, UNITED STATES Michael Peter Kucharik, BS, UNITED STATES Christopher T Eberlin, BS, UNITED STATES David Freccero, MD, UNITED STATES Eric L. Smith, MD, UNITED STATES Scott D Martin, MD, UNITED STATES
A Prospective Comparison Of Groin-Related Complications Following Hip Arthroscopy With Versus Without A Perineal Post ePoster Presentation Iciar M Davila Castrodad, MD, UNITED STATES Matthew J. Kraeutler, MD, UNITED STATES Omer Mei-Dan, MD, UNITED STATES Anthony Scillia, UNITED STATES
Hip Osteochondroplasty May Benefit The Non-Ideal Patient With Femoroacetabular Impingement: Analysis From The Embedded Prospective Cohort Of The First Trial Abstract Presentation 6 minutes Mahmoud Almasri, MD, FRCSC, UNITED STATES Nicole Simunovic, MSc, CANADA Diane Heels-Ansdell, MSc, CANADA Olufemi R. Ayeni, MD, PhD, MSc, FRCSC, CANADA FIRST Investigators, MD, CANADA
Amniotic Suspension Allograft Injection For Hip Osteoarthritis: Prospective Pilot Study With 1 Year Follow Up Abstract Presentation 5 minutes Marc R. Safran, MD, Prof., UNITED STATES Molly Claire Meadows, MD, UNITED STATES Katia Elisman, BS, UNITED STATES Shane J Nho, MD, MS, UNITED STATES
Stem Cells Injection And Percutaneous Femoral Head Decompression - An Extremely Rare Procedure With Good Results ePoster Presentation Sofia Moura De Carvalho, MD, PORTUGAL Inês Domingues, MD, PORTUGAL Liliana Domingues, MD, PORTUGAL Eduardo Ramalho Silva, MD, PORTUGAL Gonçalo Lavareda, MD, PORTUGAL Filipe Machado, MD, PORTUGAL Rita Ricardo, MD, PORTUGAL
Risk Factors For Early Conversion To Hip Arthroplasty Following Hip Arthroscopy: A Matched Cohort Analysis Abstract Presentation 4 minutes Joseph J. Ruzbarsky, MD, UNITED STATES Max Seiter, MD, UNITED STATES Rui Soares, BS, UNITED STATES Lauren Pierpoint, PhD, UNITED STATES Karen K. Briggs, MPH, MBS, UNITED STATES Marc J. Philippon, MD, UNITED STATES
Can Hip Microinstability Be Predicted By Hip Range Of Motion Abstract Presentation 5 minutes Marc R. Safran, MD, Prof., UNITED STATES Justin Hopkins, MD, UNITED STATES Katia Elisman, BS, UNITED STATES Andrea Finlay, PhD, UNITED STATES Nicole Alexandria Segovia, BA, UNITED STATES

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Not Every Hip Impingement Requires Hip Arthroscopy.

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