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Femoroacetabular Impingement and Hip Arthroscopy Ian Rice, M.D.
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Overview Newer (last 15-20 years) concept to explain hip pain and development of osteoarthritis in patients without history and radiographic evidence of hip dysplasia Stulberg in 1975 developed the term “pistol grip” deformity Ganz first described FAI in 1995 Conditions leading to FAI Posttraumatic deformities, coxa profunda (deep socket), protrusio acetabuli, acetabular retroversion Three Types of FAI CAM Pincer Combined CAM/Pincer Unclear role of genetics Siblings with a cam-type deformity have a relative risk of 2.8 Pincer-type has a relative risk of 2.0 Prevalence is low in the Eastern world Parvizi et al JAAOS 2007
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Pathophysiology of FAI 90% of patients with labral pathology have underlying structural abnormalities Insufficient congruency between femoral head and socket leads to asymmetric wear of the chondral surfaces with or without instability of the hip Reactive hip pain with movement of hip in flexed position results in abnormal engagement between the femoral head and acetabulum Affects musculature as well: adductor longus, proximal hamstrings, hip abductors, iliopsoas, hip flexor muscles Retroversion of femur itself can increase external rotation and decrease internal rotation, without elements of FAI
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Hip Anatomy Arteries of the hip joint Branches of medial and lateral circumflex arteries Deep branch of superior gluteal artery Inferior gluteal artery Nerves to the acetabular labrum Branch of the nerve to the quadratus femoris Obturator nerve
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CAM Lesion Abnormally shaped (nonspherical) femoral head Results in repeated abutment of the femoral neck into the acetabular rim causing tearing of the labrum and or avulsion from the rim Shear injury to the transition zone and adjacent articular cartilage —> good healing rates Labral and chondral lesion is often observed in the anterosuperior area of the acetabulum Typcially young, active male patients Chondrolabral delamination Sequelae of SCFE
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Pincer Lesion Overcoverage of the acetabular rim Associated with conditions like coxa profunda, acetabular retroversion Abutment between acetabulum and femoral head causes the labrum to fail usually via degenerative changes Primary intrasubstance labral injury - often less reparable Labral damage anterosuperior Posteroinferior contrecoup pattern of cartilage loss of the femoral head and acetabulum Typically middle-aged women who engage in athletic activities
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Mixed (Impingement) Patterns Both femoral and acetabular deformity (most common) Allen et al JBJS 2009 showed bilateral cam-type deformity was present in 78% of hips with only 26% symptomatic Cam Types present with pistol grip deformities, focal femoral neck prominence, flattening of lateral femoral head Pincer Types present with posterior wall sign, excessive acetabular coverage, crossover sign
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History and Physical Slow onset of groin pain with or without minor trauma (C-sign) Exacerbated by activity Athletics, prolonged walking or sitting Exam shows hip limitation of motion Impingement Test Knee & hip flexed to 90, then internally rotate the leg Positive test recreates the pain Posteroinferior impingement - external rotation with hip in extension
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75 patients Hip is flexed to 70 deg and 30 deg short of full abduction Hip is then internally and externally rotated to it’s limits of motion Pain is considered a positive test Patients were then hip scoped Sensitivity 90% and Specificity 85%
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Ligamentum Teres Tears Treatment: Debridement Internal and External Rotation of the Hip at 30 and 60 deg of abduction places the bundles of the ligaments in tension LT is max tight at 90 deg of hip flexion and 90 deg of external rotation Capsular ligaments are lax in this position Want to avoid soft tissue or bony impingement However, labral tears and pincer lesions are a confounding variable
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Imaging X-rays Standing true AP and lateral radiographs True AP: coccyx points towards the symphysis pubis with a distance of 1-2 cm between Critical to assess version MRI Arthrograms Sensitive (>90%) and specific (50-90%) for detecting labral and chondral lesions Limited in detecting undetached chondral separations
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X-ray buzzwords Increased Alpha Angle Head Neck offset Cross over or posterior wall sign Increased lateral center-edge angle Ischial spine sign Retroversion Acetabular overcoverage
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Alpha Angle Longitudinal axis of femoral neck is defined through the narrowest point and through the head center Alpha point: radius of curvature of the femoral head first exits the circle of best fit corresponding to the circular head Laborie et al BJJ 2014 found avg alpha angle in frog leg view was for men was 47 deg and 42 for women (AP view was 62 and 52 deg) Showed original thresholds of 50 deg to be too low, need to increase to 55 or even 60 deg to reduce false positive results
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Head Neck Offset Ratio Line at center of neck to head, two parallel lines at top of neck and top of femoral head gives the neck-head length. Ratio is neck to head length to diameter of head Eijer used MRI and found 7.2mm and ratio of 0.13 in symptomatic vs 11.6mm and 0.21 in asymptomatic controls Proposed 8mm and 0.17 ratio for abnormal measurements
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Ischial Spine Sign If ischial spine is present inside the pelvis, indicating of retroversion of acetabulum
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Crossover Sign Anterior wall projects lateral to medial wall before coverage at lateral acetabular sourcil
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Global Overcoverage
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Center Edge Angle Center Edge Angle (Normal 25-39, <15 is dysplasia)
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Global Overcoverage
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MRI - Normal Hip Labrum Kelly et al Arthroscopy 2005
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MRI - Labral Tear
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MRI - Degenerative Hip Labral Tear
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6 cadavers (12 hips) underwent an MRI, then injected with India Ink, then frozen and labrum was sliced into 3mm sections Zone 1 (capsular) had more vascularity than Zone II (articular) Zone 1a had most consistent source of vessels, Zone 1b had greatest overall mean vascularity score Overall, no intrinsic blood supply
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612 x-rays of the Left hip Showed a posterior rim sign (secondary ossification center of the posterior rim) which occurred around time of triradiate closure and is present for 10 months Need to be aware of this finding to ensure proper diagnosis of adolescents with acetabular undercoverage
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Non-operative Treatment Activity Modification Restriction of athletics NSAIDs PT - ROM or stretching is counterproductive Strengthening is helpful
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15 patients randomized to home exercise versus formal PT for symptomatic FAI VAS and Hip Outcome Scores measured Both groups had statistically significant improvement in their scores Conclusion: Home exercises can help as much as formal PT
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Surgical Treatment Open Femoroacetabuloplasty Surgical Dislocation Acetabular Osteotomy Hip Arthroscopy
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Surgical Dislocation Preservation of blood supply is critical Deep branch of the medial femoral circumflex artery crosses the obturator externus posteriorly, then runs anteriorly toward the short rotators and crosses the femoral neck anteriorly to become the retinacular vessels Preserve the short external rotators of the hip
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Retrospective look at 19 patients Found the MFCA is intact when the obturator externis tendon is not damaged Deep branch of MFCA runs anterior to the tendon of the obturator interns and gemelli Travels posterior and extracapsularly toward the intertrochanteric crest between the iliopsoas laterally and the pectinous medially along the base of the femoral neck
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Trochanteric Flip Osteotomy Initially described by Ganz et al BJJ 2001 Perfomed at the site of the lateral border of the piriformis fossa proximally and at the vastus ridge distally Trochanter segment will have a small attachment of the abductor muscles which can be retracted anteriorly MFCA is protected by obturator externus S shaped capsulotomy to expose hip joint and hip can then be dislocated Osteotomy is fixed with two 4.5mm cortical screws Risks: trochanteric osteotomy nonunion, femoral head osteonecrosis, heterotopic ossification, hip abductor weakness Ganz et al BJJ 2001
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Trochanteric Flip Osteotomy Ganz et al BJJ 2001
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Trochanteric Flip Osteotomy Ganz et al BJJ 2001
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Trochanteric Flip Osteotomy
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Anterior approach has less visibility of the acetabulum. Bleeding from drill holes in femoral head has a high correlation with preserved blood supply. Ligamentum teres has nerve endings like an ACL, so potential loss of proprioception with excision.
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Femoral Resection Osteoplasty
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Anteversion Periacetabular Osteotomy Performed for pincer type rim impingement due to global acetabular retroversion and posterior wall insufficiency Complications Inadequate correction of deformity, intra-articular osteotomy, nonunion of superior pubic ramus, loss of fixation and correction, symptomatic implants, neurovascular injury
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Acetabular Rim Trimming Resection Arthroplasty
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Hip Arthroscopy
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Common Indications Symptomatic labral tears FAI Chondral/OCD lesions Loose bodies Ligamentum teres injuries Snapping hip syndrome
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Hip Arthroscopy Minimally invasive technique for diagnostic and therapeutic management of FAI Downsides Depth of resection in the removal of CAM lesions, especially on posterior neck region, is difficult to assess Difficult to master
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Hip Scope Technique Portals - Critical to the success of the case Anterolateral, anterior, posterolateral Positioning Operative hip is placed in extension, with 25 deg of abduction and neutral rotation Traction should be placed to distract the femoral head outwards instead of downwards Image from Smith and Nephew
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Open or Scope? Bedi et al AJSM 2011 compared 30 patients open dislocation vs 30 patients hip scope for cam impingement Found no significant differences in deformity corrections Open technique may allow greater correction of posterosuperior regions Botser et al Arthroscopy 2011 found higher rate of return to sport for arthroscopy in professional athletes than for open surgical dislocations Wilkin et al JBJS 2014 found little benefit for arthroscopic labral debridement in patients older than 45
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36 female patients prospectively randomized to labral repair versus debridement Hip Outcome Score to determine function Found HOS was significantly improved (91.2 vs 80.9) in repair compared to debridement
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https://www.vumedi.com/video/arthroscopic-repair-of-hip-labral-tears-utilizing-the-iberian-suture-technique/
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243 patients who underwent hip arthroscopy for FAI Mean age 29.2 years with postop f/u of 21 months Outcome measures: modified Harris hip score, Hip Outcome Score, Activities of Daily Living, and Sports subclass, and International Hip Outcome Tool Results: Patients with relative retroversion (<5 deg of anteversion) had significantly less clinical improvement when compared with normal or increased version
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Focus of paper is on surgical technique Key Points CAM resection should be less than 1cm deep, 8mm from proximal to distal, and 15mm medial to lateral beginning 1 cm from the labral margin Over 30% resection of femoral neck width increases risk of fracture CAM lesions are almost exclusively anterior, anterolateral or lateral Post Op Care Touch Down Weight Bearing to 20lbs of force for 2 weeks after Early ROM with CPM and passive circumduction exercises
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Case Example 39 yo F with groin pain, worse with flexion, adduction, internal rotation.
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Case Example #2 29 yo F with history of congenital hip dysplasia as an infant treated with a Palvik harness. She complains of pain with daily activities, and has been gradually worsening over the last year.
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MRI
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OITE
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OITE A 35 year old man reports a 2 year history of right groin pain. The pain is made worse with hip flexion, prolonged sitting, and cycling. A radiograph and MRI scan are shown in Figures 16a and 16b. Nonsurgical management has failed to provide relief. What is the best surgical option? 1) Arthroscopic labral debridement 2) Reverse periacetabular osteotomy 3) Resurfacing hip arthroplasty 4) Femoral neck osteochondroplasty and resection of the detached labrum 5) Femoral neck osteochondroplasty and reattachment of the labrum
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5 - Femoral neck osteochondroplasty and reattachment of the labrum