Does hip muscle strength and functional performance differ between football players with and without hip dysplasia?

Objective: To compare hip muscle strength and functional performance in football players with and without hip dysplasia and investigate if the relationships were modified by sex. Design: Cross-sectional study. Methods: This study compared football players with hip dysplasia (HD group) and without hip dysplasia (control group). Hip muscle strength (Nm/kg) and functional task performance were assessed in both groups. Linear regression with generalized estimating equations were used to assess differences between groups. Sex was assessed as a potential effect modifier. Results: 101 football players were included (HD group, n = 50, control group, n = 87). There was no difference in hip muscle strength or functional performance between the HD group and the control group. Results ranged from hip extension strength (Estimate −0.13.95%CI: 0.29 to 0.02, P = 0.087) to hip external rotation strength (Estimate 0.00.95%CI: 0.05 to 0.05, P = 0.918). No relationships were modified by sex or age. Conclusions: Similar levels of hip muscle strength and functional performance were found in active football players with and without hip dysplasia. These findings differ from other studies. This may be due to our cohort having less advanced hip dysplasia than the surgical populations that have been previously investigated, or due to a beneficial effect of football participation on muscle strength and functional performance in people with hip dysplasia.</p

Greater understanding of normal hip physical function may guide clinicians in providing targeted rehabilitation programmes

Objectives: This study investigated tests of hip muscle strength and functional performance. The specific objectives were to: (i) establish intra- and inter-rater reliability; (ii) compare differences between dominant and non-dominant limbs; (iii) compare agonist and antagonist muscle strength ratios; (iv) compare differences between genders; and (v) examine relationships between hip muscle strength, baseline measures and functional performance. Design: Reliability study and cross-sectional analysis of hip strength and functional performance. Methods: In healthy adults aged 18-50. years, normalised hip muscle peak torque and functional performance were evaluated to: (i) establish intra-rater and inter-rater reliability; (ii) analyse differences between limbs, between antagonistic muscle groups and genders; and (iii) associations between strength and functional performance. Results: Excellent reliability (intra-rater ICC = 0.77-0.96; inter-rater ICC = 0.82-0.95) was observed. No difference existed between dominant and non-dominant limbs. Differences in strength existed between antagonistic pairs of muscles: hip abduction was greater than adduction (p < 0.001) and hip ER was greater than IR (p < 0.001). Men had greater ER strength (p = 0.006) and hop for distance (p < 0.001) than women. Strong associations were observed between measures of hip muscle strength (except hip flexion) and age, height, and functional performance. Conclusions: Deficits in hip muscle strength or functional performance may influence hip pain. In order to provide targeted rehabilitation programmes to address patient-specific impairments, and determine when individuals are ready to return to physical activity, clinicians are increasingly utilising tests of hip strength and functional performance. This study provides a battery of reliable, clinically applicable tests which can be used for these purposes

Changes in hip muscle strength after proximal femoral fracture in elderly women

Hip muscle weakness is an often-occurring condition after displaced fractures of the proximal femur in older patients. The aim of this study was to compare hip muscle strength and pain in elderly female patients after proximal femoral fracture. Nine female patients (mean±SD of 71.4±3.9 yrs) participated in this study. Knee extensor, hip abductor and adductor muscle strength was evaluated with handheld dynamometer Lafayette (USA) during the first week of postoperative stay in hospital, and 6 months postfracture with fractured and nonfractured leg. Pain was assessed using a visual analogue scale. A week after the operation knee extensor, hip abductor and adductor muscle isometric muscle strength for the fractured leg was decreased (p&lt;0.05) by 50.7%, 55.6% and 38.8%, respectively, compared to the nonfractured limb. At 6-month follow-up, hip muscle strength increased significantly (p &lt; 0.05) in both the fractured and nonfractured leg. Hip muscle strength for the fractured leg was significantly lower (p&lt;0.05) compared with the nonfractured leg 6 months after surgery. Pain score was significantly (p&lt;0.05) higher during the first postoperative week as compared to 6 months follow-up.It was concluded that voluntary maximal isometric force-generating capacity of knee and hip muscles for the fractured leg was markedly increased 1 week and 6 months postoperatively. Isometric force-generating capacity for the fractured leg was significantly improved by 6 months follow-up

Isometric hip muscle strength in posttraumatic below-knee amputees

Background/Aim. Traumas and war injuries, next to chronic occlusive artery disease and diabetes mellitus-derived complications, are the most frequent cause of the lower limbs amputation. They affect mostly younger population that need a higher level of activities as compared with the elderly. Medical rehabilitation is very significant for the muscle performance improvement in this population providing their social reintegration. The aim of this study was to investigate the effect of below-knee amputation on the hip isometric muscle strength and effect of rehabilitation on improvement of hip muscle strength in below-knee amputees, secondary to war wounding. Methods. Forty below-knee amputees (after war wounding), average age 35.6±10.6 years, that were included in primary rehabilitation program with prosthetics, were examined. Objective parameters were used to evaluate therapeutical effects. Isometric muscle strength of hip flexors, extensors, abductors and adductors was measured by dynamometer and expressed in Newton (N) at admission, control and discharge for each patient. Average length of the treatment was 51 ± 34.1 days. Results. For isometric hip flexors (t = - 1.99346, p &lt; 0.05), extensors (t = -4.629073, p &lt; 0.001), abductors (t = -4.9408, p &lt; 0.001) and adductors (t = -2.00228, p &lt; 0.05), muscle strength was significantly less on the amputated than on nonamputated side. The highest differences in muscle strength between amputated and nonamputated limbs were noted for hip abductors (26.6%) and extensors (23.3%). There was significant improvement of mean values of strength for all examined hip muscles after rehabilitation and prosthetics for both legs in comparison to beginning of the therapy. The hip abductor on the amputated side was for 19.4% weaker after rehabilitation in comparison to the nonamputated limb. Conclusion. Decreases of isometric muscle strength in all examined hip muscles were observed, more in the amputated limb. Rehabilitation with prosthetics is a successful method for improving isometric hip muscle strength on the both, amputated and non-amputated limbs in war wounded below-knee amputees

The Gait Deviation Index Is Associated with Hip Muscle Strength and Patient-Reported Outcome in Patients with Severe Hip Osteoarthritis:A Cross-Sectional Study

<p>A-B. Representative examples of the association between mGDI and clinical outcomes.</p

Single-Leg Squat Performance is Impaired 1 to 2 Years After Hip Arthroscopy

Objective: To evaluate single-leg squat performance 1-2 years after arthroscopy for intra-articular hip pathology compared with control subjects and the nonsurgical limb, and to investigate whether single-leg squat performance on the operated limb was associated with hip muscle strength

Standardising muscle strength measurement protocols in femoroacetabular impingement: RE: Kierkegaard, S., Mechlenburg, I., Lund, B., Søballe, K., & Dalgas, U. (2017). Impaired hip muscle strength in patients with femoroacetabular impingement syndrome. Journal of Science and Medicine in Sport.

We read with interest the article entitled “Impaired hip muscle strength in patients with femoroacetabular impingement syndrome” Kierkegaard et al. It is certainly an interesting article and shows reduced muscle strength in the affected as well as the unaffected hips in those suffering with femoroacetabular impingement (FAI)

Does medial knee pain decrease when the hip muscle strength increases? A literature review

Background: The knee joint is a common source of pain and the most common localization of this pain is the medial part of the humero-tibial joint. Pain can induce a change in the recruitment of muscles, there may be a change in the power and the distribution of muscle activity within the muscles in order to protect the painful structure. In addition to reduced strength in the quadriceps muscle in persons with knee joint pain, it has also been seen a decreased strength in the hip joint muscles, compared to healthy people. Purpose: The purpose of this study was to determine whether resistance training of the hip joint muscles may reduce medial knee joint pain. Method: A literature review was conducted searching the following databases, PubMed, SveMed, Pedro, Amed, Embase, SportDiscuss and Cinahl. Personal contacts with authors of articles were also taken. Four articles were included in the study. The articles were reviewed for methodological quality by a modified review template. Result: Two of the studies included resistance training of both knee joint- and hip joint muscles. All the included studies showed a significant decrease of the knee pain all though there was no significant increase of the hip muscle strength in one of the studies and no significant difference in the increase of the hip muscle strength between control- and intervention group in another study. The studies were found to be of moderate quality (2 pre-post intervention design) and of high quality (2 RCT-design). Conclusion: The result of the literature review implies that persons with medial knee pain could benefit from including resistance training of the hip muscles in the rehabilitation when the purpose is reducing pain. However, more studies are required to confirm this.Bakgrund: Knäsmärta är vanligt förekommande och den vanligaste lokalisationen för knäsmärta är medialt i femurotibialleden. Smärta kan leda till att muskelrekrytering sker på annat sätt än i smärtfritt tillstånd vad gäller till exempel kraft och distribution av aktivitet inom muskeln. Syftet med detta är att skydda den smärtande strukturen. Förutom minskad styrka i quadricepsmuskeln vid knäsmärta har även nedsatt styrka i höftmuskulaturen setts, vid jämförelse med friska individer. Syfte: Syftet var att undersöka om styrketräning av höftmuskulatur kan minska smärta medialt i knäleden. Metod: En litteraturstudie genomfördes med sökningar i PubMed, SveMed, Pedro, Amed, Embase, SportDiscuss och Cinahl, även kontakter med artikelförfattare togs. Studierna granskades enligt en modifierad kvalitetsgranskningsmall. Resultat: Två av studierna inkluderade styrketräning av både höft- och knämuskler. Alla studierna visade en signifikant minskning av medial knäsmärta, en studie visade ingen styrkeökning och en annan studie visade ingen signifikant skillnad mellan försöks- och kontrollgrupp vad gäller styrkeökning. Studiernas metodologiska kvalitet var måttlig (2 pre-post interventionsdesign) respektive hög (2 RCT-studier). Konklusion: Resultatet tyder på att det finns viss grund för personer med medial knäsmärta att inkludera styrketräning av höftmuskulaturen i sin rehabilitering när syftet är att minska smärtan, men fler studier behövs för att ytterligare bekräfta detta

Hip muscle weakness in patients with symptomatic femoroacetabular impingement

SummaryObjectiveFemoroacetabular impingement (FAI) is a pathomechanical process, which may cause hip pain, disability and early development of hip osteoarthritis (OA) in young and active adults. Patients with FAI experience functional disability during dynamic weight-bearing activities, which could originate from weakness of the hip muscles. The objective of this study was to compare hip muscle strength between patients with symptomatic FAI and healthy controls. It was hypothesized that patients would present overall hip muscle weakness compared to controls.MethodsA total of 22 FAI patients and 22 controls matched for gender, age, and body mass participated in the study. We evaluated isometric maximal voluntary contraction (MVC) strength of all hip muscle groups using hand-held and isokinetic dynamometry, and electromyographic (EMG) activity of the rectus femoris (RF) and tensor fasciae latae (TFL) muscles during active flexion of the hip.ResultsFAI patients had significantly lower MVC strength than controls for hip adduction (28%), flexion (26%), external rotation (18%) and abduction (11%). TFL EMG activity was significantly lower in FAI patients compared with controls (P=0.048), while RF EMG activity did not differ significantly between the two groups (P=0.056).ConclusionsPatients with symptomatic FAI presented muscle weakness for all hip muscle groups, except for internal rotators and extensors. Based on EMG recordings, it was demonstrated that patients with symptomatic FAI have a reduced ability to activate TFL muscle during hip flexion. These findings provide orthopedic surgeons with objective information about the amount and specificity of hip muscle weakness in patients with FAI. Future research should investigate the relationship between hip muscle weakness, functional disability and overuse injury risks, as well as the effects of hip muscle strengthening on clinical outcomes in individuals with symptomatic FAI