Outcomes of Hip Arthroscopy in Patients With Previous Lumbar Spine Surgery: A Matched-Pair Controlled Comparative Study With Minimum Two-Year Follow-Up.

PURPOSE: The purpose of this study was to conduct a matched-pair analysis to determine the effect of prior lumbar spine surgery (LSS) on clinical outcomes of hip arthroscopy. METHODS: Data were prospectively collected on all patients undergoing hip arthroscopy during the study period from April 2008 to December 2012. Patients were excluded if they had previous hip conditions or had undergone prior hip surgery. Patients in the LSS group (history of LSS) were matched in a 1:1 ratio to a control group (no history of LSS) according to age ±5 years, gender, body mass index categories, Tönnis grade, and labral treatment. The following outcomes were recorded in each group: modified Harris Hip Score, Non-Arthritic Hip Score (NAHS), Hip Outcome Score-Sports Specific Subscale, Hip Outcome Score-Activities of Daily Living, and visual analogue scale (VAS) score for pain, patient satisfaction, and rates for revision hip arthroscopies and conversion to total hip arthroplasty (THA). RESULTS: During the study period, 1,405 hip arthroscopies were performed with 1,017 eligible for matching. A total of 873 (85.8%) patients had a minimum 2-year follow-up. Fifty-seven patients were matched in each group. Both groups demonstrated significant improvement in patient-reported outcome (PRO) and VAS scores. The LSS group had a lower mean for all preoperative PRO scores. There was no significant difference for the postoperative mean PRO score and change in the PRO score compared with the control group except for NAHS. The mean change in the NAHS demonstrated a greater magnitude of improvement in the LSS group. There was no significant difference between mean VAS scores, patient satisfaction, and rates for revision arthroscopy and conversion to THA between the groups. CONCLUSIONS: Prior LSS does not adversely affect outcomes of hip arthroscopy at a minimum 2-year follow-up. These patients have lower preoperative scores but similar magnitude of improvement and revision/THA rates compared with a matched comparative group of patients without prior LSS. LEVEL OF EVIDENCE: Level II, retrospective analysis of prospectively collected data.

Arthroscopic Reconstruction of the Irreparable Acetabular Labrum: A Match-controlled Study.

PURPOSE: To report clinical outcomes of arthroscopic labral reconstruction in the hip at minimum 2-year follow-up in comparison to a pair-matched labral repair group. METHODS: Patients were included in this study if they underwent labral reconstruction during hip arthroscopy and had minimum 2-year follow-up data available. Exclusion criteria were active workers' compensation claims or previous ipsilateral hip surgery or conditions. Reconstruction patients were matched 1:2 to patients that underwent arthroscopic labral repair but otherwise met all inclusion and exclusion criteria. Matching criteria were age within 5 years, sex, body mass index within 5, same capsular treatment, and whether there was chondral damage of Outerbridge grade II or greater. Three patient-reported outcome (PRO) measures and visual analog scale (VAS) for pain were recorded preoperatively and at a minimum of 2 years postoperatively. International Hip Outcome Tool and patient satisfaction were also collected at latest follow-up. RESULTS: Thirty-four reconstruction patients were matched to 68 repair patients. There were no significant differences in age (P = .941), sex (P > .999), body mass index (P = .935), or any other demographics between groups. A statistically significant increase was seen in PROs for both the reconstruction group (Modified Harris Hip Score, P = .002; Hip Outcome Score - Sports Subscale, P<.001; Non-arthritic Hip Score, P<.001) and the repair group (Modified Harris Hip Score, P<.001; Hip Outcome Score - Sports Subscale, P < .001; Non-arthritic Hip Score, P<.001) at minimum 2-year follow-up. Significant decrease was shown for VAS for both groups (reconstruction VAS, P<.001; repair, P<.001) at minimum 2-year follow-up. There were no significant differences in rates of postoperative complications (P>.999), secondary arthroscopy (P>.999), or conversion to total hip arthroplasty (P = .728) between groups. CONCLUSIONS: Arthroscopic labral reconstruction is associated with significant improvement in PROs and a low incidence of secondary surgery within 2-year follow-up. Improvements in PROs, VAS, patient satisfaction, and incidence of secondary procedures were comparable to a match control treated with labral repair. Although there were no differences shown in the 2 groups with respect to complication rate, secondary arthroscopy, or conversion to total hip arthroplasty, the study was not powered to compare these outcome parameters. Based on this evidence, either labral repair or reconstruction may be selected depending upon the clinical scenario. LEVEL OF EVIDENCE: Level III; retrospective comparative study.

Clinical outcomes of patients with symptomatic acetabular rim fractures after arthroscopic FAI treatment.

This study aims to investigate the influence of the acetabular rim fractures on outcomes of hip arthroscopy at minimum 2-year follow-up. Between January 2009 and August 2012, data were prospectively collected on all patients undergoing hip arthroscopy. Anatomic findings, including presence of rim fractures, were recorded intraoperatively. Patients were assessed preoperatively and at 3 months, 1 year and minimum 2 years postoperatively with four patient-reported outcome measures: modified Harris Hip Score, Non-Arthritic Hip Score, Hip Outcome Score-Activities of Daily Living and Hip Outcome Score-Sport Specific Subscales. Pain was estimated using a visual analog scale. Satisfaction was measured on a scale from 0 to 10. Patients with rim fractures were identified and retrospectively matched to a control group based on gender, BMI category, and age at surgery within 3 years and compared in terms of demographic factors, intraoperative findings, procedures and outcomes. Twenty-one patients with rim fractures were matched to a control group of 21 patients with symptomatic femoroacetabular impingement without rim fractures. No significant differences were detected with respect to demographic characteristics, surgical procedures (besides the removal of rim fractures), or in terms of preoperative, postoperative, or improvement in patient-reported outcome scores and satisfaction. The presence or absence of an acetabular rim fracture does not significantly influence clinical outcomes at minimum 2-year follow-up after hip arthroscopy. Case-control study design is used in this study.

Outcomes of gluteus maximus and tensor fascia lata transfer for primary deficiency of the abductors of the hip.

PURPOSE: This study aims to present 3 patients' results after undergoing gluteus maximus and tensor fascia lata (TFL) transfer for chronic abductor tears unable to be repaired primarily. METHODS: 3 patients were identified intraoperatively as having an abductor tear unable to be repaired primarily. The anterior 1/3 of the gluteus maximus and the posterior 1/3 of the TFL were mobilised and transferred to the greater trochanter in order to reproduce the normal force vector of the gluteus medius and minimus. Data was prospectively collected for changes in gait, abductor strength, and the following patient reported outcomes (PROs): modified Harris Hip Score (mHHS), Nonarthritic Hip Score (NAHS), Hip Outcome Score-Sports Specific Subscale (HOS-SSS), Hip Outcome Score-Activities of Daily Living (HOS-ADL), visual analogue scale (VAS), and satisfaction. RESULTS: The patients were female, 63-75 years old, with BMIs of 23-28. All patients had follow-up at mean 2.1 years (1.25-2.5) with positive Trendelenburg signs preoperatively; 2 patients normalised postoperatively. For 2 patients, abductor strength improved by 2 grades postoperatively; the other patient maintained grade four. 2 patients' PROs all improved; the other patient's PROs all improved except mHHS. Postoperative VAS scores were 0, 0, 1. 2 patients reported maximum satisfaction. CONCLUSIONS: This case series suggests that gluteus maximus and TFL transfer for irreparable abductor deficiency may be effective for pain relief, improving abductor strength, and reconstructing abductor function. Although this is a small series, it is to our knowledge the first report of clinical outcomes of this procedure.

Minimum 2-Year Outcomes of Hip Arthroscopic Surgery in Patients With Acetabular Overcoverage and Profunda Acetabulae Compared With Matched Controls With Normal Acetabular Coverage.

BACKGROUND: Advancements in instrumentation and techniques have extended the scope of hip arthroscopic surgery to treat complex osseous deformities that were previously best addressed with an open approach. Global pincer-type femoroacetabular impingement is an example of an abnormality requiring osseous correction with a technically challenging access point. PURPOSE: To report on the patterns of clinical presentation and intra-articular derangements, radiological associations, and minimum 2-year outcomes after hip arthroscopic surgery in patients with a lateral center edge angle (LCEA) >40° and profunda acetabulae in comparison with matched controls with normal acetabular coverage. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Data were collected on all patients undergoing hip arthroscopic surgery during the study period from April 2008 to April 2013. All patients who had undergone hip arthroscopic surgery for symptomatic labral tears not responsive to a minimum of 3 months of physical therapy with both an LCEA >40° and profunda acetabulae, as defined by the ilioischial line lateral to the medial border of the teardrop, and without a history of hip surgery or hip conditions were included. This group was matched in a 1-to-1 ratio with a control group that had also undergone the arthroscopic management of symptomatic labral tears refractory to a minimum of 3 months of physical therapy with an LCEA between 25° and 40° according to age within 3 years, sex, body mass index category, Tönnis grade, labral treatment, and capsular treatment. Range of motion, impingement signs, and radiographic indices of coverage and version were recorded for each group. Four patient-reported outcome (PRO) scores, the visual analog scale (VAS) for pain, patient satisfaction, revision hip arthroscopic surgery, and conversion to total hip arthroplasty (THA) were also recorded. RESULTS: Thirty-nine patients met the inclusion criteria for the study (overcoverage) group, of which 36 (92.3%) patients had a minimum 2-year follow-up; 215 patients satisfied the inclusion criteria for the control (normal coverage) group, of which 183 (85.1%) had a minimum 2-year follow-up. Thirty-six patients were matched in each group using the above criteria. There was no difference with respect to range of motion and impingement signs between the groups. The study group had significantly higher radiological markers of overcoverage but not retroversion compared with the control group. The study group had a significantly higher incidence of Seldes type 2 tears compared with the control group: 50.0% versus 19.4%, respectively ( P = .013). Both groups demonstrated significant improvements in the mean scores of all PROs, but the study group had a lower magnitude of improvement for all the PROs compared with the control group, with the modified Harris Hip Score (mHHS) achieving statistical significance: 13.5 versus 21.7 points, respectively ( P = .032). The study group had a significantly lower mean patient satisfaction score compared with the control group: 6.61 versus 7.91, respectively ( P = .019). The study group also had a significantly higher incidence of conversion to THA compared with the control group: 4 versus 0, respectively ( P = .040). CONCLUSION: Hip arthroscopic surgery for the management of symptomatic labral tears in patients with combined overcoverage and coxa profunda is associated with improvements in patient outcomes and pain at a minimum 2-year follow-up. However, the degree of improvement is of lower magnitude compared with a matched cohort with normal coverage undergoing the arthroscopic management of symptomatic labral tears. While hips with lateral overcoverage combined with coxa profunda may have a smaller potential for improvement compared with hips with normal coverage, this type of osseous morphology is still repairable with arthroscopic treatment.

Arthroscopic Reconstruction of Segmental Defects of the Hip Labrum: Results in 22 Patients With Mean 2-Year Follow-Up.

PURPOSE: To report mean 2-year patient-reported outcomes (PROs) and the incidence of revision hip arthroscopy or conversion to total hip arthroplasty (THA) in patients who had undergone arthroscopic reconstruction of the hip labrum for segmental defects. METHODS: Data were prospectively collected and retrospectively reviewed on all patients who had undergone hip arthroscopy from April 2008 to April 2013. All patients who underwent arthroscopic labral reconstruction with either a semitendinosus allograft or a gracilis autograft with mean 2-year follow-up were part of the inclusion criteria. The following outcomes were recorded: modified Harris hip score, nonarthritic athletic hip score, hip outcome score-sports-specific subscale, hip outcome score-activities of daily living subscale, visual analog scale, for pain, patient satisfaction, revision hip arthroscopies, and conversion to THA. A 2-tailed Student's t-test was used to assess for statistically significant differences between the mean of preoperative and postoperative PROs. P values less than .05 were considered statistically significant. RESULTS: A total of 22 patients (14 females, 8 males) met the inclusion criteria. There was 100% follow-up. The mean age of the study population was 32.2 years. Twelve patients had reconstruction as part of a revision procedure and 10 patients had a reconstruction at the time of primary arthroscopy. Concomitant arthroscopic procedures included acetabuloplasty and femoroplasty. There was statistically significant improvement in all PROs (P = .013 to < .001). The mean changes for the modified Harris hip score, nonarthritic athletic hip score, hip outcome score-sports-specific subscale, and hip outcome score-activities of daily living subscale were 11.0 ± 19.5, 22.2 ± 15.0, 23.1 ± 30.9, and 19.1 ± 17.5 points, respectively. The mean improvement in the visual analog scale was 3.33 ± 2.92 points (P < .001), and the mean patient satisfaction was 6.73 out of 10 points. One patient required conversion to THA for presumed progression of osteoarthritis and 2 patients required a revision procedure for adhesions. CONCLUSIONS: This arthroscopic technique for labral reconstruction was associated with a significant improvement in PROs and function. Conversion to THA with the procedure was 4.5%. LEVEL OF EVIDENCE: Level IV, therapeutic case series.

Arthroscopic Capsular Plication and Labral Seal Restoration in Borderline Hip Dysplasia: 2-Year Clinical Outcomes in 55 Cases.

PURPOSE: To report clinical outcomes in patients with borderline dysplasia undergoing an arthroscopic technique of labral seal restoration with minimal acetabular rim resection and capsular plication. METHODS: Patients younger than 40 years with a lateral center-edge angle of 18° greater and 25° or less and 2-year follow-up after undergoing an arthroscopic technique of labral seal restoration with minimal rim resection (≤2 mm) and capsular plication (3-5 sutures placed in an oblique orientation to create an imbrication and inferior shift) were included. Patients underwent arthroscopy for symptoms that had marginal improvement with a minimum 6-week structured physical therapy program. Patients with a Tönnis grade of 1 or greater, a center-edge angle of 17° or less, and Legg-Calvé-Perthes disease were excluded. The following patient-reported outcomes (PROs) were recorded prospectively but retrospectively reviewed: modified Harris Hip Score, Non-Arthritic Hip Score, Hip Outcome Score-Sports-Specific Subscale, and Hip Outcome Score-Activities of Daily Living. The visual analog scale score, patient satisfaction score, complications, and revision procedures were also recorded. A 2-tailed paired t test was used to analyze change in preoperative to postoperative PRO scores. Significance was defined as P < .05. RESULTS: During the study period, 232 hip arthroscopies were performed in patients with a lateral center-edge angle between 18° and 25°. The inclusion criteria were met by 59 procedures. Of these procedures, 55 (93.2%) were available for follow-up. The labrum was repaired, debrided, and reconstructed in 37 procedures, 17 procedures, and 1 procedure, respectively. The iliopsoas was released in 34 procedures, the ligamentum teres was debrided in 29, and femoral osteoplasty was performed in 32. At 2-year follow-up, there was significant improvement in the mean scores of all PROs compared with baseline. Mean improvements for the modified Harris Hip Score, Hip Outcome Score-Activities of Daily Living, Hip Outcome Score-Sports-Specific Subscale, and Non-Arthritic Hip Score were 20.7, 17.5, 27.6, and 20.0, respectively. There was significant improvement in the visual analog scale score at 2 years, decreasing by 3.16 compared with baseline, and the mean patient satisfaction score was 8.09, with 83.6% of patients achieving a good to excellent result (patient satisfaction score ≥7). No complications were related to the procedure, and 6 patients (11%) required revision procedures (4 for labral retear, 1 for painful iliopsoas internal snapping, and 1 for removal of a symptomatic loose body). CONCLUSIONS: Arthroscopic intervention that encompasses minimal rim resection, restoration of labral function, and capsular plication significantly improves outcomes in patients with borderline dysplasia who do not warrant a periacetabular osteotomy. LEVEL OF EVIDENCE: Level IV, therapeutic case series.

Minimum 2-Year Outcomes of Arthroscopic Management of Symptomatic Hip Labrum Tears in Patients With Global Acetabular Overcoverage.

PURPOSE: To report minimum 2-year patient-reported outcomes (PROs) after hip arthroscopy (HA) for symptomatic labral tears in patients with global acetabular overcoverage. METHODS: This study was a retrospective case series of patients who underwent HA from April 2008 to April 2013. The inclusion criteria were patients with global acetabular overcoverage, defined as a lateral center-edge angle greater than 40°, and with coxa profunda, defined radiologically by the ilioischial line lateral to the acetabular floor. Only patients with minimum 2-year follow-up and no history of hip conditions or surgery were included. We recorded demographic, examination, radiologic, and intraoperative findings; intraoperative procedures performed; and the following PROs: modified Harris Hip Score (mHHS), Non-Arthritic Hip Score, Hip Outcome Score-Activities of Daily Living (HOS-ADL), Hip Outcome Score-Sports-Specific Subscale (HOS-SSS), visual analog scale, and patient satisfaction. RESULTS: The inclusion criteria were met by 39 patients, of whom 35 (89.7%) had 2-year follow-up. There was no distinct pattern of examination findings. The study population had a mean acetabular inclination of -1.19° and an anterior center-edge angle of 35°. There was no association with measures of acetabular retroversion. Intrasubstance tearing of the labrum occurred in 75% of patients (mean tear size, 2.68 hours on acetabular clock face; mean location, 11.5 to 3 on acetabular clock face). There were significant improvements in the mean scores for all PROs: mHHS, 13.5 ± 17.7 points (P < .01); Non-Arthritic Hip Score, 14.3 ± 21.3 (P < .001); HOS-ADL, 11.6 ± 19.7 (P < .001); HOS-SSS, 17.1 ± 35.1 (P < .001); and visual analog scale, -2.77 ± 2.58 (P < .001). The mean patient satisfaction rating was 6.61. The improvements in mHHS, HOS-ADL, and HOS-SSS did not reach the minimal clinically important difference. The incidence of secondary procedures was 17% (4 patients underwent conversion to total hip arthroplasty and 2 required revision HA). CONCLUSIONS: HA in patients with global acetabular overcoverage was associated with improvements in PROs and pain at minimum 2-year follow-up. However, these improvements did not reach the minimal clinically important difference for the mHHS, HOS-ADL, and HOS-SSS. The incidence of secondary procedures was 17%. The pattern of labral injury is predominantly intrasubstance labral damage with a narrow rim of adjacent chondral injury. LEVEL OF EVIDENCE: Level IV, therapeutic case series.

Arthroscopic Treatment of Labral Tears of the Hip in Adolescents: Patterns of Clinical Presentation, Intra-articular Derangements, Radiological Associations and Minimum 2-Year Outcomes.

PURPOSE: To report on patterns of clinical presentation, intra-articular derangements, radiological associations, and minimum 2-year outcomes after hip arthroscopy (HA) in patients 18 years or younger. METHODS: This study was a retrospective case series on patients 18 years or younger who had undergone HA for labral tears that had failed nonoperative management from April 2008 to April 2013 with a minimum 2-year follow-up. Exclusion criteria were previous hip conditions or surgery. The following were recorded: demographic, examination, radiological and intraoperative findings, intraoperative procedures performed, patient-reported outcomes (PROs), and patient satisfaction. The PROs reported included the modified Harris Hip Score, Non-Arthritic Hip Score, Hip Outcome Score-Sport-Specific Subscale, Hip Outcome Score-Activities of Daily Living, and Visual Analogue Score for pain. RESULTS: One hundred and two patients satisfied the inclusion criteria, of whom 90 (88.2%, 77 females and 13 males) had minimum 2-year follow-up. Females had increased external rotation in flexion (58.9° vs 50.0°, P = .041). Sixty-eight females had a Beighton's score of >4 compared to 6 males (P < .001). There was no distinct pattern within the group or between genders for radiological markers of acetabular coverage, depth, or version and femoral cam size. Mean femoral anteversion for females was 15.7° and for males 11.3°. Females had significantly smaller labral tears (1.73 hours vs 2.34 hours on the acetabular clock face, P = .028). Females were more likely to require a capsular plication and iliopsoas fractional lengthening (88.3% vs 46.2%, and 77.9% vs 38.5%, respectively). There was a significant improvement in all PRO measures in both males and females (P < .01), but females had lower preoperative and postoperative scores. Mean preoperative and postoperative PROs for males and females were as follows: modified Harris Hip Score 71.0/94.3 and 63.4/88.8, Hip Outcome Score-Activities of Daily Living 78.1/93.4 and 64.0/91.8, Hip Outcome Score-Sport-Specific Subscale 51.7/91.0 and 45.7/78.6, Non-Arthritic Hip Score 78.1/94.5 and 63.1/89.2, and visual analog score 4.77/1.85 and 6.29/2.21. The mean patient satisfaction score was 8.29 out of 10. Five patients (5.56%) required a revision procedure. CONCLUSIONS: HA is associated with improved outcomes and pain and high satisfaction scores at minimum 2-year follow-up in adolescent population. The pattern of labral injury is different in males and females and dictates the arthroscopic approach. Females are likely to require a capsular plication and iliopsoas release to address soft-tissue laxity and impingement. LEVEL OF EVIDENCE: Level IV, therapeutic case series.

Outcomes of Hip Arthroscopy in Patients with Tönnis Grade-2 Osteoarthritis at a Mean 2-Year Follow-up: Evaluation Using a Matched-Pair Analysis with Tönnis Grade-0 and Grade-1 Cohorts.

BACKGROUND: Osteoarthritis adversely impacts hip arthroscopy outcomes. The purpose of this study was to conduct a matched-pair analysis with a mean follow-up of 2 years to evaluate the outcomes following hip arthroscopy in patients with Tönnis grade-2 osteoarthritis. METHODS: Data were prospectively collected on all patients undergoing hip arthroscopy during the study period from April 2008 to December 2012. Patients were excluded if they had previous hip conditions. Patients were categorized into Tönnis grade-0, grade-1, or grade-2 osteoarthritis groups and were matched in a 1:1 ratio according to age within 5 years, sex, and body mass index. Four patient-reported outcome scores, a visual analog scale (VAS) score for pain, patient satisfaction level, and rates of revision hip arthroscopy and conversion to total hip arthroplasty were recorded. RESULTS: During the study period, 1,412 hip arthroscopies were performed. Of those, 1,079 satisfied the inclusion criteria, and 935 (86.7%) of them had a follow-up of 2 years. Seven hundred and thirty-eight, 154, and 43 patients had Tönnis grade-0, grade-1, and grade-2 osteoarthritis, respectively. Thirty-seven patients were matched in each group. All groups demonstrated a significant improvement in patient-reported outcomes and VAS scores. A good-to-excellent result was seen in 69.7%, 75.8%, and 65.4% of the patients in the Tönnis grade-0, grade-1, and grade-2 groups, respectively. No significant difference among the groups was found with respect to the mean change in patient-reported outcomes, VAS scores, and patient satisfaction level. There was no significant difference in the rate of revision arthroscopy. Tönnis grade-2 hips had an odds ratio for conversion to total hip arthroplasty of 7.73 (95% confidence interval [CI], 2.00 to 29.83) compared with Tönnis grade-0 hips and 4.36 (95% CI, 1.38 to 13.4) compared with Tönnis grade-1 hips. CONCLUSIONS: Hips with Tönnis grade-2 osteoarthritis had a significantly higher rate of conversion to total hip arthroplasty at the 2-year follow-up compared with matched cohorts of Tönnis grade-0 and grade-1 hips. Thus, hip arthroscopy has a limited role as a joint preservation procedure in select patients with Tönnis grade-2 osteoarthritis. LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Outcomes of Hip Arthroscopic Surgery in Patients With Tönnis Grade 1 Osteoarthritis With a Minimum 2-Year Follow-up: Evaluation Using a Matched-Pair Analysis With a Control Group With Tönnis Grade 0.

BACKGROUND: There are limited studies on the effect of mild osteoarthritis (OA) on outcomes of hip arthroscopic surgery. PURPOSE: To conduct a matched-pair analysis with a minimum 2-year follow-up to evaluate outcomes after hip arthroscopic surgery in patients with Tönnis grade 1 OA. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Data were prospectively collected on patients who underwent hip arthroscopic surgery between April 2008 and December 2012. Patients were excluded if they had previous hip conditions. The remaining patients were divided into either Tönnis 0 or 1 grade OA groups and were matched in a 1-to-1 ratio according to age within 5 years, sex, body mass index category, labral treatment, and capsular treatment. Four patient-reported outcome (PRO) scores, as well as the visual analog scale (VAS) score for pain, patient satisfaction, and rates of revision arthroscopic surgery and conversion to total hip arthroplasty (THA), were recorded. RESULTS: A total of 1412 hip arthroscopic procedures were performed during the study period, of which 1036 met the inclusion criteria and 892 (86.1%) had 2-year follow-up. There were 738 and 154 patients with Tönnis grade 0 and 1, respectively; 93 patients were matched in each group. The Tönnis grade 0 group had a mean follow up of 28.7 months (range, 23.5-67.9 months), and the Tönnis grade 1 group had a mean follow up of 31.5 months (range, 23.6-63.5 months). Both groups demonstrated a significant improvement in all PROs and the VAS at a minimum 2-year follow-up. For the Tönnis grade 0 group, the improvements (in points) in the PROs were as follows: modified Harris Hip Score (mHHS), 15.51; Nonarthritic Hip Score (NAHS), 20.65; Hip Outcome Score-Activities of Daily Living (HOS-ADL), 16.83; and Hip Outcome Score-Sport-Specific Subscale (HOS-SSS), 20.91. The VAS score for the Tönnis grade 0 group decreased by 2.82 points. For the Tönnis grade 1 group, the improvements (in points) in the PROs were as follows: mHHS, 19.52; NAHS, 20.96; HOS-ADL, 18.20; and HOS-SSS, 21.61. The VAS score for the Tönnis grade 1 group decreased by 2.84 points. No significant difference was found between the mean change in PROs, VAS, or patient satisfaction between the groups (P > .05). There was no significant difference in subsequent rates for revision arthroscopic surgery or conversion to THA between the groups (P = .3 and .6, respectively). The rates for revision arthroscopic surgery and conversion to THA were 9.68% and 9.68%, respectively, in the Tönnis grade 0 group and 5.38% and 11.83%, respectively, in the Tönnis grade 1 group. CONCLUSION: At 2-year follow-up, patients with Tönnis grade 1 OA had improved outcomes after hip arthroscopic surgery, with no significant difference compared with a matched control group of patients with Tönnis grade 0 OA. However, further studies are underway to determine if the results of the Tönnis grade 1 cohort will deteriorate over longer term follow-up.

Open and Arthroscopic Treatment of Adult Hip Dysplasia: A Systematic Review.

PURPOSE: To compare patient-reported outcome (PRO) and rates of conversion to total hip arthroplasty (THA) after hip arthroscopy, Bernese periacetabular osteotomy (PAO), and a combined approach for the management of patients with different grades of hip dysplasia. METHODS: We searched MEDLINE and PubMed databases for articles published since 2000 using the following terms: (((("hip dysplasia") or "dysplastic") and "arthroscopy")) or ((("hip dysplasia") or "dysplastic") and "osteotomy"). Two authors independently reviewed the literature. Inclusion criteria were English language, relevance to hip dysplasia, surgical outcomes, and sample size of 10 patients or more. We excluded articles that were reviews or techniques; articles that included overlapping populations, patients with a mean age less than 18 years, patients with other hip conditions, patients with genetic or neuromuscular causes of hip dysplasia, and patients with Tonnis grade 2 or greater arthritis; articles on femoral osteotomy, and articles on previous surgical intervention, except hip arthroscopy. Articles were analyzed for PRO scores and rates of conversion to THA. RESULTS: Ten of 759 articles reviewed met the inclusion and exclusion criteria. Of 834 hips treated for dysplasia with a mean age of 31 years, 114 were treated with arthroscopy alone, 703 were treated with PAO alone, and 17 were treated with both procedures. Mean follow-up was 3.2 years, 6.5 years, and 5.6 years, respectively. Conversion rates to THA were 4.8%, 12.0%, and 17.7%, respectively. In studies reporting pre- and postoperative PRO scores, all but one reported improvement. CONCLUSIONS: The management of hip dysplasia may entail hip arthroscopy, PAO, or a combined approach. Arthroscopy has resulted in improved outcomes in borderline dysplastic cases (lateral center edge angle between 18° and 25°). PAO has primarily been used in true dysplasia with continued success. There were too few combined procedures of arthroscopy with PAO to reach a reliable conclusion in this subgroup.