Squatting biomechanics following physiotherapist-led care or hip arthroscopy for femoroacetabular impingement syndrome: a secondary analysis from a randomised controlled trial.

Background: Femoroacetabular impingement syndrome (FAIS) can cause hip pain and chondrolabral damage that may be managed non-operatively or surgically. Squatting motions require large degrees of hip flexion and underpin many daily and sporting tasks but may cause hip impingement and provoke pain. Differential effects of physiotherapist-led care and arthroscopy on biomechanics during squatting have not been examined previously. This study explored differences in 12-month changes in kinematics and moments during squatting between patients with FAIS treated with a physiotherapist-led intervention (Personalised Hip Therapy, PHT) and arthroscopy. Methods: A subsample (n = 36) of participants with FAIS enrolled in a multi-centre, pragmatic, two-arm superiority randomised controlled trial underwent three-dimensional motion analysis during squatting at baseline and 12-months following random allocation to PHT (n = 17) or arthroscopy (n = 19). Changes in time-series and peak trunk, pelvis, and hip biomechanics, and squat velocity and maximum depth were explored between treatment groups. Results: No significant differences in 12-month changes were detected between PHT and arthroscopy groups. Compared to baseline, the arthroscopy group squatted slower at follow-up (descent: mean difference -0.04 m∙s-1 (95%CI [-0.09 to 0.01]); ascent: -0.05 m∙s-1 [-0.11 to 0.01]%). No differences in squat depth were detected between or within groups. After adjusting for speed, trunk flexion was greater in both treatment groups at follow-up compared to baseline (descent: PHT 7.50° [-14.02 to -0.98]%; ascent: PHT 7.29° [-14.69 to 0.12]%, arthroscopy 16.32° [-32.95 to 0.30]%). Compared to baseline, both treatment groups exhibited reduced anterior pelvic tilt (descent: PHT 8.30° [0.21-16.39]%, arthroscopy -10.95° [-5.54 to 16.34]%; ascent: PHT -7.98° [-0.38 to 16.35]%, arthroscopy -10.82° [3.82-17.81]%), hip flexion (descent: PHT -11.86° [1.67-22.05]%, arthroscopy -16.78° [8.55-22.01]%; ascent: PHT -12.86° [1.30-24.42]%, arthroscopy -16.53° [6.72-26.35]%), and knee flexion (descent: PHT -6.62° [0.56- 12.67]%; ascent: PHT -8.24° [2.38-14.10]%, arthroscopy -8.00° [-0.02 to 16.03]%). Compared to baseline, the PHT group exhibited more plantarflexion during squat ascent at follow-up (-3.58° [-0.12 to 7.29]%). Compared to baseline, both groups exhibited lower external hip flexion moments at follow-up (descent: PHT -0.55 N∙m/BW∙HT[%] [0.05-1.05]%, arthroscopy -0.84 N∙m/BW∙HT[%] [0.06-1.61]%; ascent: PHT -0.464 N∙m/BW∙HT[%] [-0.002 to 0.93]%, arthroscopy -0.90 N∙m/BW∙HT[%] [0.13-1.67]%). Conclusion: Exploratory data suggest at 12-months follow-up, neither PHT or hip arthroscopy are superior at eliciting changes in trunk, pelvis, or lower-limb biomechanics. Both treatments may induce changes in kinematics and moments, however the implications of these changes are unknown. Trial registration details: Australia New Zealand Clinical Trials Registry reference: ACTRN12615001177549. Trial registered 2/11/2015.

Effect of Spinopelvic Parameters on Outcomes After Hip Arthroscopy for Femoroacetabular Impingement Syndrome.

BACKGROUND: Spinopelvic parameters, including pelvic tilt (PT), sacral slope (SS), and pelvic incidence, have been developed to characterize the relationship between lumbar spine and hip motion, but a paucity of literature is available characterizing differences in spinopelvic parameters among patients with femoroacetabular impingement syndrome (FAIS) versus patients without FAIS, as well as the effect of these parameters on outcomes of arthroscopic treatment of FAIS. PURPOSE: To (1) identify differences in spinopelvic parameters between patients with FAIS versus controls without FAIS; (2) identify associations between spinopelvic parameters and preoperative patient-reported outcomes (PROs); and (3) identify differences in PROs between patients with stiff spines (standing-sitting ΔSS ≤10°) versus those without. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: The study enrolled patients ≥18 years of age who underwent primary hip arthroscopy for treatment of FAIS with cam, pincer, or mixed (cam and pincer) morphology. Participants underwent preoperative standing-sitting imaging with a low-dose 3-dimensional radiography system and were matched on age and body mass index (BMI) to controls without FAIS who also underwent EOS imaging. Spinopelvic parameters measured on EOS films were compared between the FAIS and control groups. Patients with FAIS completed the modified Harris Hip Score (mHHS) and Non-Arthritic Hip Score (NAHS) before surgery and at 1-year follow-up. Outcome scores were compared between patients with stiff spines versus those without. Associations between spinopelvic parameters and baseline outcome scores were assessed with Pearson correlations. Continuous variables were compared with Student t test and/or Mann-Whitney U test, and categorical variables were compared with Fisher exact test. RESULTS: A total of 50 patients with FAIS (26 men; 24 women; mean age, 36.1 ± 10.7 years; mean BMI, 25.6 ± 4.2) were matched to 30 controls without FAIS (13 men; 17 women; mean age, 36.6 ± 9.5 years; mean BMI, 26.7 ± 3.6). Age, sex, and BMI were not significantly different between the FAIS and control groups (P > .05). Standing PT was not significantly different between stiff and non-stiff cohorts (P = .73), but sitting PT in the FAIS group was more than double that of the control group (36.5° vs 15.0°; P < .001). Incidence of stiff spine was significantly higher in the FAIS group (62.0% vs 3.3%; P < .001). Among FAIS patients, those with stiff spines had a significantly higher prevalence of cam impingement, whereas those with non-stiff spines had a higher prevalence of mixed impingement (P = .04). No significant differences were seen in preoperative mHHS or NAHS scores or pre- to postoperative improvement in scores between FAIS patients with stiff spines versus those without (P > .05), but a greater sitting SS was found to be positively correlated with a higher baseline mHHS (r = 0.36; P = .02). CONCLUSION: Patients with FAIS were more likely to have a stiff spine (standing-sitting ΔSS ≤10°) compared with control participants without FAIS. FAIS patients with stiff spines were more likely to have isolated cam morphology than patient without stiff spines. Although sitting SS was positively correlated with baseline mHHS, no significant differences were seen in 1-year postoperative outcomes between FAIS patients with versus without stiff spine.

Can a clinical assessment predict the functional status progression in patients with femoroacetabular impingement syndrome?

BACKGROUND: Femoroacetabular impingement syndrome (FAIS) is a hip joint motion-related clinical disorder with a triad of symptoms, clinical signs, and imaging findings. However, scientific evidence is still unclear regarding the best treatment for FAIS. OBJECTIVES: To assess the value of a physical therapy evaluation in predicting the progression of functional status over the subsequent years in patients with FAIS who are candidates for hip arthroscopy surgery. METHODS: In this case-series study, patients with FAIS, candidates for hip arthroscopy surgery, underwent a standard physical therapy evaluation. Baseline data were collected between 2013 and 2019. In 2020/2021, the patients' functional status was assessed through the International Hip Outcome Tool (iHOT-33). Functional status progression was calculated as the difference between the follow-up and baseline iHOT-33 scores. A multivariate forward stepwise regression analysis was conducted to explore the relationship between baseline characteristics and the functional status progression. RESULTS: From 353 patients who completed the baseline assessment, 145 completed the iHOT-33 follow-up. The mean (±SD) follow-up time was 58.7 (27.2) months (minimum 12 and maximum 103 months). The iHOT-33 scores increased 20.7 (21.8) points on average, ranging from -39.8 to 76.9 points. Among the 15 potential predictive factors assessed in this study, only baseline iHOT-33 score (ß -0.44; -0.061, -0.27), femoral version (ß 9.03; 1.36, 16.71), and body mass index (ß -0.99; -1.98, -0.01) had the ability to predict the functional status progression. CONCLUSION: Patients with a lower baseline iHOT-33 score, lower body mass index, and normal femoral version were more likely to increase their functional status after a minimum of one year of follow-up.

Lost in research translation: Female athletes are not male athletes, especially at the hip.

Altered shape of the proximal femur (cam morphology) or acetabulum (pincer morphology) is indicative of femoroacetabular impingement, which can result in hip pain and osteoarthritis of the hip. As mechanical load during growth affects the resulting bone shape, there is strong evidence in males that cam morphology develops during skeletal growth while physes are open, rather than as an adaptation after growth plates are closed (skeletal maturity). This adaptation is particularly evident in athletes who participate at elite levels prior to skeletal maturity. The research providing this evidence, however, has primarily focused on male athletes. Despite the lack of inclusion in the research, females consistently comprise two thirds of the clinical and surgical populations with structural hip pain or pathology. Knowledge gained from male-dominated cohorts may not appropriately transfer to female athletes, especially at the hip. This perspectives article briefly reviews differences between females and males in femoral and acetabular structure, hormones, timing of puberty/maturation, hypermobility, activity level and movement control-factors which affect hip structure development and loading. Without female-focused research, the application of research findings from male athletes to female athletes may lead to ineffective or even inappropriate recommendations and treatments. Thus, there is a critical need for investment in research to promote life-long hip health for females.

Investigating pelvic drop gait abnormality in adolescent hip pathology patients.

BACKGROUND: Trendelenburg gait describes contralateral pelvic drop during single leg stance (SLS) with occasional lateral trunk lean compensation over the stance limb. However, quantitative research on 'uncompensated Trendelenburg' gait (pelvic drop independent of lateral trunk lean) remains sparse among populations that commonly utilize this gait pattern, such as adolescent hip pathology patients. RESEARCH QUESTION: How prevalent is uncompensated Trendelenburg among various adolescent hip pathologies and how is it related to hip load, hip abduction strength, and self-reported hip pain? METHODS: Gait, strength, and pain data were collected among 152 pre-operative patients clinically diagnosed with acetabular hip dysplasia, femoroacetabular impingement, Legg-Calvé-Perthes, or slipped capital femoral epiphysis (SCFE). Patients with ≥ 5.4° of dynamic pelvic drop in SLS were divided into a 'pelvic drop' group and screened to exclude those with excessive ipsilateral trunk lean. They were then compared to the 'stable pelvis' patients using a Mann-Whitney test. RESULTS: Dysplasia patients represented the highest proportion of the pelvic drop group (46%). The pelvic drop group showed a significant increase in self-reported hip pain (p = 0.011), maximum hip abductor moment (p = 0.002), and peak coronal power absorption at the affected hip during SLS loading response, (p < 0.001) while showing no difference in abduction strength (p = 0.381). SIGNIFICANCE: Uncompensated Trendelenburg gait may lead to increased loading of the affected hip in adolescent hip pathology patients. Disadvantageous hip biomechanics can create increased abductor muscle demand among these pathological populations, with dysplasia patients showing the highest prevalence. Maximal abduction strength did not correlate with pelvic drop. Future work should aim to identify and quantify causal factors. Increased coronal hip power absorption during weight acceptance warrants clinical attention, as there may be a detrimental, over-reliance on passive hip structures to support load among a population that that is already predisposed to hip osteoarthritis.

Hip Arthroscopy Improves Sexual Function in Receptive Partners with Femoroacetabular Impingement Syndrome.

BACKGROUND: Hip pain due to femoroacetabular impingement (FAI) is thought to adversely impact sexual satisfaction because of exacerbation of symptoms with hip ROM. However, the effect of FAI on sexual satisfaction and improvement after surgery to treat FAI is largely absent from published studies, despite patients' apparent interest in it as registered by the frequent appearance of these topics on online anonymous discussion platforms. In addition, details regarding its impact on the decision to pursue surgery and the success of hip arthroscopy in alleviating FAI-related sexual dysfunction based on the specific role assumed during intercourse (penetrative versus receptive) remains unknown. QUESTIONS/PURPOSES: Given that sexual intercourse involves different amounts of hip ROM depending on whether patients assume the penetrative or receptive role, this study evaluated the effect of FAI and hip arthroscopy on sexual activity based on role. Compared with patients who participate in the penetrative role during sexual intercourse, do patients who participate in the receptive role (1) experience greater difficulty with sexual function because of FAI symptoms, (2) take longer to return to sexual intercourse after hip arthroscopy, and (3) experience greater improvements in reported sexual function after hip arthroscopy for FAI? METHODS: This was a retrospective cohort study of patients undergoing hip arthroscopy for FAI. Between January 2017 and December 2021, 293 patients were treated with hip arthroscopy for FAI and enrolled in our longitudinally maintained database. Among all patients treated surgically, 184 patients were determined to be potentially eligible for study inclusion based on a minimum follow-up of 6 months postoperatively. The 6-month timepoint was chosen based on published data suggesting that at this timepoint, nearly 100% of patients resumed sexual intercourse with minimal pain after hip arthroscopy. Of the potentially eligible patients, 33% (61 patients) could not be contacted by telephone to obtain verbal consent for participation and 9% (17 patients) declined participation, leaving 106 eligible patients. Electronic questionnaires were sent to all eligible patients and were returned by 58% (61 patients). Forty-two percent of eligible patients (45) did not respond to the questionnaire and were therefore excluded from the analysis. Two percent (2) completed most survey questions but did not specify their role during intercourse and were therefore excluded. The mean age of included patients was 34 ± 9 years, and 56% were women The mean follow-up time was 2 ± 1 years. In total, 63% of included patients reported participating in the receptive role during sexual intercourse (49% receptive only and 14% both receptive and penetrative). Hip symptoms during sexual intercourse preoperatively and postoperatively were evaluated using a questionnaire created by our team to answer our study questions, drawing from one of the only published studies on the matter and combining the questionnaire with sexual position-specific questions garnered from arthroplasty research. Patients who reported participating in the receptive role during intercourse (either exclusively or in addition to the penetrative role) were compared with those who participated exclusively in the penetrative role. There were no specific postoperative recommendations in terms of the timing of return to sexual intercourse, other than to resume when comfortable. RESULTS: Overall, 61% of patients (36 of 59) reported that hip pain somewhat or greatly interfered with sexual intercourse preoperatively. Patients who participated in receptive intercourse were more likely to experience preoperative hip pain that interfered with intercourse than patients who participated exclusively in penetrative intercourse (odds ratio 5 [95% confidence interval 2 to 15]; p < 0.001). Postoperatively, there was no difference in time until return to sexual activity between those in the penetrative group (median 6 weeks [range 2 to 14 weeks]) and those in the receptive group (median 6 weeks [range 4 to 14 weeks]; p = 0.28). Postoperatively, a greater number of patients participating in the penetrative role reported no or very little pain, compared with patients participating in the receptive role (67% [14 of 21] versus 49% [17 of 35]). However, with regard to preoperative to postoperative improvement, patients who participated in the receptive role had greater pain with positions involving more hip flexion and abduction and experienced a greater improvement than their penetrative counterparts in these positions postoperatively. Despite this improvement, however, 33% of patients (7 of 21) participating in the penetrative role and 51% of patients (18 of 35) participating in the receptive role continued to report either some or a great amount of pain at final follow-up. CONCLUSION: Hip pain secondary to FAI interferes with sexual relations, particularly for partners who participate in the receptive role. Postoperatively, both patients participating in receptive and penetrative intercourse resumed sexual intercourse at a median of 6 weeks. After hip arthroscopy, the greatest improvement in pain was seen in receptive partners during sexual positions that involved more hip flexion and abduction. Despite this improvement, most patients, regardless of sexual role assumed, reported some degree of residual pain. Patients planning to undergo arthroscopic surgery for FAI, particularly those who participate in receptive intercourse, should be appropriately counseled about reasonable postoperative expectations based on our findings. LEVEL OF EVIDENCE: Level III, therapeutic study.

Sagittal Pelvic Tilt Directly Influences the Ischiofemoral Space: A Cadaveric Study.

BACKGROUND: Ischiofemoral impingement (IFI) is understood to be a pain generator in the deep gluteal space. Femoral position is known to influence the ischiofemoral space (IFS), but there has been no study examining the effect of sagittal pelvic tilt on the IFS. The purpose of this study was to determine whether changes in pelvic tilt in the sagittal plane lead to changes in the dimensions of the IFS. MATERIALS AND METHODS: Five fresh frozen cadavers (10 hips) were used for this anatomic study. The specimens were skeletonized and placed in the prone position with the pelvis fixed to a custom-built hinged table. A digital inclinometer was used to tilt the pelvis -10°, 0°, and 10° simulating posterior, neutral, and anterior pelvic tilt, respectively. Digital calipers were used to measure the dimensions of the IFS in all three positions of sagittal pelvic tilt. RESULTS: Changes in pelvic tilt resulted in significant changes in the dimensions of the IFS. Mean IFS dimensions measured 29.3±9.7 mm, 37.2±9.0 mm, and 24.3±9.2 mm in the neutral, anterior, and posterior pelvic tilt positions, respectively (P<.0001). CONCLUSION: Changes in sagittal pelvic tilt influence the dimensions of the IFS, with posterior pelvic tilt noted to significantly decrease the IFS when compared with neutral and anterior pelvic tilt. These findings suggest that further evaluation of sagittal spinopelvic balance in the etiology of symptomatic IFI may be warranted. [Orthopedics. 2024;47(3):167-171.].

Patient-reported hip pain and function are worse among elite Nordic ski athletes competing in ski jumping versus Nordic combined: a cross-sectional analysis.

OBJECTIVES: Nordic ski athletes are at increased risk of developing hip pain and dysfunction secondary to femoroacetabular impingement syndrome (FAIS), but it is unclear whether hip symptomatology differs between ski jumping (SJ) and Nordic combined (NC) athletes. The purpose of this study was to compare patient-reported hip pain and dysfunction between elite Nordic ski athletes participating in SJ versus NC. METHODS: A cross-sectional study was conducted involving SJ and NC athletes who competed at the international and U.S. national levels during the 2021-2022 season. Subjects were excluded if they had hip surgery within two years prior to enrollment. Subjects were asked to undergo diagnostic workups for FAIS, including physical examination and plain radiographic imaging. Subjects were asked to complete a survey that collected information on athletic and training history and to complete the hip disability and osteoarthritis outcome score (HOOS). Demographics, athletic/training history, and HOOS sub-scores were compared between the SJ and NC groups using the Student's t-test, Wilcoxon rank-sum test, or Fisher's exact test, as appropriate. p-values < 0.05 were considered significant. RESULTS: Twenty-four athletes (13 SJ, 11 NC) were included in the study. There were no statistically significant differences in age, sex, BMI, or age of menarche between the two groups (all p â€‹> â€‹0.05). There were also no statistically significant differences in the number of prior sports participated in, total hours of participation in prior sports, or total hours of training in Nordic specialization (all p â€‹> â€‹0.05). Among the 18 athletes who underwent physical examination (9 SJ, 9 NC), there were no statistically significant inter-group differences in hip range of motion or incidence of positive impingement tests (all p â€‹> â€‹0.05). Among the 19 athletes who underwent imaging (9 SJ, 10 NC), there were no statistically significant inter-group differences in the incidence of cam or pincer morphology in at least one hip (all p â€‹> â€‹0.05). SJ athletes had statistically significantly worse HOOS sub-scores for hip symptoms and stiffness, hip function in sports/recreational activities, and hip-related quality of life compared to NC athletes (all p â€‹< â€‹0.05). CONCLUSION: Elite SJ athletes have worse self-reported hip function compared to elite NC athletes, despite comparable demographics, athletic history, and duration of ski training. LEVEL OF EVIDENCE: IV.

Dolor atraumático de cadera en adulto joven / Atraumatic hip pain in young adults

El dolor de la cadera en el adulto joven es un proceso fisiopatológico incapacitante que puede estar en relación con múltiples etiologías. Es necesario conocer el proceso diagnóstico para conseguir un tratamiento y seguimiento adecuados. Presentamos el caso de una mujer de 29 años con anemia, dolor atraumático de cadera derecha y cojera de un mes de evolución. El diagnóstico diferencial se plantea con entidades infecciosas, reumatológicas, tumorales, necrosis avascular de cadera, choque femoroacetabular, displasia de cadera, coxartrosis y síndromes peritrocantéreos (AU)

Hip pain in the young adult is a disabling pathophysiological process may be related to multiple etiologies. The process must be determined in order to make a diagnosis and follow-up treatment. The case is presented of a 29 year old woman with anemia, atraumatic hip pain on the right side, and a limp of one month onset. The differential diagnosis includes infectious, rheumatological, tumor, avascular necrosis of hip, hip impingement, hip dysplasia, osteoarthritis and other syndromes (AU)

Prevalence of radiographic markers of femoroacetabular impingement in asymptomatic adults / Prevalência dos achados radiográficos de impacto femoroacetabular em adultos assintomáticos

OBJECTIVE: to determine the prevalence of radiographic signs of femoroacetabular impingement (FAI) in asymptomatic adults and correlate them with data from physical examinations. METHODS: We conducted a cross-sectional study with 82 asymptomatic volunteers, 164 hips, between 40 and 60 years of age, selected by convenience. They were submitted to anamnesis and clinical examination of the hip, anteroposterior (AP) pelvis radiographs with three incidences, Dunn 45° and Lequesne false profile of each hip, to measure the variables. We measured the alpha angle, anterior offset of the femoral neck, cervical diaphyseal angle, CE angle of Wiberg, acetabular index, Sharp angle, and the crossing, ischial spine and posterior wall signs. RESULTS: our sample consisted of 66% women, mean age of 50.4 years. The average alpha angle was 45.10°, SD=8.6. One quarter of the hips showed alpha angle greater than or equal to 50°; among men the prevalence was 34%, and among women, 11%. We found indicative radiographic signs of femoroacetabular impingement in 42.6% of hips, whether femoral or acetabular, and the increased alpha angle was related to the decrease in hip internal rotation (p<0.001). CONCLUSION: the radiographic findings of femoroacetabular impingement in asymptomatic patients were frequent in the studied sample. The increase in alpha angle was associated with decreased internal rotation. .

OBJETIVO: determinar a prevalência dos sinais radiográficos de impacto femoroacetabular (IFA) em adultos assintomáticos e correlacionar com dados do exame físico. MÉTODOS: estudo transversal, com 82 voluntários, 164 quadris, selecionados por conveniência, assintomáticos, entre 40 e 60 anos de idade. Esses foram submetidos à anamnese e exame clínico do quadril, exame radiográfico com três incidências, antero-posterior (AP) de bacia, Dunn a 45° e falso perfil de Lequesne de cada quadril, para mensuração das variáveis. Aferimos o ângulo alfa, offset anterior do colo femoral, ângulo cérvico diafisário, ângulo CE de Wiberg, índice acetabular, ângulo de Sharp, além dos sinais do cruzamento, da espinha isquiática e da parede posterior. RESULTADOS: nossa amostra foi formada por 66% de mulheres, com média de idade de 50,4 anos. O ângulo alfa médio foi de 45.10º, DP = 8.6. 25% dos quadris apresentaram ângulo alfa maior ou igual a 50°; entre os homens a prevalência foi 34% e entre as mulheres 11%. Encontramos sinais radiográficos indicativos de impacto femoroacetabular em 42,6% dos quadris, sejam eles femorais ou acetabulares, e o aumento do ângulo alfa esteve relacionado com o decréscimo na rotação interna do quadril (p < 0,001). CONCLUSÃO: Os achados radiográficos de impacto femoroacetabular em pacientes assintomáticos foram frequentes na amostra estudada. O aumento do ângulo alfa esteve relacionado com o decréscimo da rotação interna. .

Pinzamiento femoroacetabular: asociación entre el área de sobrecobertura y la zona de delaminación condral acetabular / Femoroacetabular impingement: association between the over-coverage and acetabular cartilage delamination areas

Introducción. El pinzamiento femoroacetabular es un síndrome reconocido como fuente de coxalgia y artrosis temprana de cadera. Están descritos 2 tipos de pinzamiento según la alteración ósea predominante, que se asocia a daños condrales característicos. El tipo cam (o leva) frecuentemente se asocia a delaminación condral; el tipo pincer (o pinza) se asocia a lesión por contragolpe en el aspecto posteroinferior del acetábulo. Nosotros hemos observado una estrecha asociación entre la zona de sobrecobertura o retroversión acetabular (alteración tipo pincer) y el área de delaminación condral (típicamente asociada con el pinzamiento tipo cam). Objetivo. Evaluar la correlación entre la zona de sobrecobertura o retroversión acetabular y el área de delaminación condral, y si al tratar la alteración tipo pincer, se elimina el área de delaminación. Métodos. Estudio prospectivo de 16 pacientes (17 caderas) con pinzamiento y delaminación condral, tratadas con fresado acetabular y reinserción labral, además de osteoplastia femoral en los casos necesarios. Resultados. Todos los casos presentaban la delaminación condral en el área acetabular anterosuperior, correspondiente a la zona de sobrecobertura o retroversión. En 16 caderas (94%) después de resecar la sobrecobertura acetabular se eliminó la zona delaminada dejando el cartílago remanente estable. Solo un caso (6%) requirió microfracturas para tratar el hueso subcondral expuesto después de resecar la sobrecobertura acetabular y el cartílago delaminado. Conclusión. La delaminación condral acetabular tiene una fuerte asociación con la zona de sobrecobertura o retroversión, lo que permitiría tratar la delaminación condral al eliminar el pincer (AU)

Background. Femoroacetabular impingement (FAI), it is a clinical syndrome relatively recently recognized as source of hip mechanic pain and early osteoarthritis. Two types of FAI have been described, based on the bone morphology and pattern of chondral and labral damage; the cam type is frequently associated with chondral delamination; and the pincer type is associated with a contre-coup injury of the posteroinferior acetabulum. A close relationship between the zone of acetabular overcoverage or retroversion and the area of acetabular chondral delamination has been observed. Objective. To evaluate the relationship between the acetabular overcoverage or retroversion zone, and the cartilage delamination area; and if by treating the overcoverage zone, the cartilage delamination area itself is also treated. Methods. A prospective evaluation was conducted on 16 patients (17 hips) with FAI and chondral delamination treated with acetabular trimming and labral reinsertion, and femoral bump resection. Results. All cases had chondral delamination in the anterosuperior acetabular area, corresponding to the overcoverage or retroversion zone. In the 16 patients (94% of the hips) after the acetabular overcoverage bone resection, the remaining cartilage was stable and without delamination. Only one case (6%) required microfractures to treat the exposed subchondral bone after delaminated cartilage debridement. Conclusion. The acetabular chondral delamination area has a very close relationship with the acetabular overcoverage zone, meaning that the delamination area can be treated by trimming the overcoverage zone (AU)