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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Treatment of Bilateral Hip Femoroacetabular Impingement: Simultaneous or Staged? Abstract Presentation 5 minutes Gen Lin Foo, MD, SINGAPORE Catherine J. Bacon, PhD, MSc, BSc, BPhed(Hons), NEW ZEALAND Matthew J. Brick, MBChB, FRACS, NEW ZEALAND
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 春宝李, 医学博士，博士, CHINA Shanxing Zhang, MD, CHINA
Arthroscopic Tendon Release for Iliopsoas Impingement after Total Hip Arthroplasty ePoster Presentation Michael Andreas Finsterwald, MD, AUSTRALIA Georgina Waters, MD, AUSTRALIA Jay R. Ebert, PhD, AUSTRALIA Christopher W. Jones, FAOrthA FRACS PhD MBBS(Hons) BEng(Hons) BCom, AUSTRALIA Piers Yates, MBBS(Hons) BSc(Hons) MRCS(Eng) FRCS(Tr & Orth) FRA, AUSTRALIA Peter Alberto D'Alessandro, MBBS Hons. (UWA) FRACS FAOrthA, AUSTRALIA
Efficacy Of Tranexamic Acid In Hip Fracture Surgeries ePoster Presentation Aabid Sanaullah, MBBS,MRCS,MRCPS,PGDipTrauma Surg.FEBOT,FRCSTr&Orth, UNITED KINGDOM Adeel Nawab Ditta, MBBS, MRCS, UNITED KINGDOM Olufunso Damilare Onayemi, MRCS MCH (Ortho), UNITED KINGDOM Ahsan Sheeraz, BSc MBBS MRCS, UNITED KINGDOM Atif A. Malik, MB ChB, MRCS Ed, MSc. (Orto. Eng), FRCS Tr & Orth, UNITED KINGDOM
The Surgeon Mentor Program: Outcomes of Total Hip Arthroplasty via the Direct Anterior Approach ePoster Presentation Christopher J. Wilson, A/Prof, MBChB, MRCS, FRACS, PhD, AUSTRALIA Melinda Jiang, MD, AUSTRALIA Mark Inglis, FRACS BMBS B Med Sci FOrthoA, AUSTRALIA David Morris, MD, AUSTRALIA Nathan Eardley-Harris , MBBS, MClinSc, AUSTRALIA
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
Psychologically Distressed Patients Can Obtain Meaningful Clinical Benefit from Arthroscopic Hip Surgery ePoster Presentation Benjamin Saks, MD, UNITED STATES Rachel Glein, BS, UNITED STATES Hari Krishna Ankem, MD, UNITED STATES Andrew Jimenez, MD, UNITED STATES Payam William Sabetian, MD, GUATEMALA Ajay C. Lall, MD, MS, FAAOS, UNITED STATES Benjamin G. Domb, MD, UNITED STATES
Are Femoral And Tibial Derotation Osteotomies Effective In Improving Hip And Knee Pain And Function? 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
Results After Arthroscopic Treatment Of Iliopsoas Impingement After Total Hip Arthroplasty ePoster Presentation Wolfgang Miehlke, MD, GERMANY Christian Sobau, MD, GERMANY Alexander Zimmerer, MD, GERMANY
Alpha Angle More Useful Than Femoral Head-Neck Offset to Predict Intra-Articular Damage in Patients with FAI Undergoing Hip Arthroscopy Abstract Presentation 5 minutes Jacob Shapira, MD, UNITED STATES Jade S Owens, BS, UNITED STATES David R. Maldonado, MD, UNITED STATES Philip Joseph Rosinsky, MD, UNITED STATES Hari Krishna Ankem, MD, UNITED STATES Bezalel Peskin, MD, ISRAEL Ajay C. Lall, MD, MS, FAAOS, UNITED STATES Benjamin G. Domb, MD, UNITED STATES
Mid-Term Outcome and Strength Assessment after Proximal Rectus-Femoris-Refixation in Athletes ePoster Presentation Maximilian Hinz, MD, GERMANY Stephanie Geyer, MD, GERMANY Felix Winden, Cand Med, GERMANY Alexander Braunsperger, B.Sc., GERMANY Florian Kreuzpointner, PhD, GERMANY Benjamin Daniel Kleim, MBBS, MD, MRes, GERMANY Andreas B. Imhoff, MD, Prof. Emeritus, GERMANY Julian Mehl, MD, GERMANY
Hip Labrum Reconstruction With A Polyurethane Scaffold: A Preliminary Report Of 3 Cases ePoster Presentation Bruno Capurro, MD, PhD., SPAIN Marc Tey, MD, PhD., SPAIN Raul Torres, MD, SPAIN Fernando Marques, MD, PhD., SPAIN Alfonso León, MD, PhD., SPAIN Oliver Marín-Peña, MD, SPAIN Joan Carles Monllau, MD, PhD, Prof., SPAIN
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

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Not Every Hip Impingement Requires Hip Arthroscopy.

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