Is the femoral component flexion affected by the sagittal femoral shaft bowing in conventional intramedullary guided TKA?

Abstract Background The aim of the present study was to investigate the influence of sagittal femoral bowing on sagittal femoral component alignment, and whether there was correlation between sagittal femoral component alignment and coronal femoral component alignment. Methods We retrospectively reviewed 77 knees in 71 patients who had undergone primary TKA for advanced osteoarthritis. All surgeries were performed by using a standard medial parapatellar approach. The osteotomy was performed with a conventional technique using an intramedullary rod for the femur and a mechanical extramedullary guiding system for the tibia. All patients enrolled in the study were evaluated with full-length lower extremity load-bearing standing scanograms, and the patients had preoperative and postoperative radiographs of the knees. Coronal femoral bowing angle (cFBA), sagittal femoral bowing angle (sFBA), and postoperatively, mechanical tibiofemoral angle of the knee (mTFA), β angle (femoral component flexion angle) were measured. The radiographic results of both groups were compared using Student's t test. A two-sided Pearson correlation coefficient was obtained to identify the correlations between FBA in the coronal and sagittal planes, as well as FBA and age or BMI, sFBA and β angle, cFBA and mTFA. Comparison of FSB incidence between different genders was made using Chi-square test. The p value < 0.05 indicates a statistically significant difference. Results The mean sFBA, cFBA, β angle, mTFA were 9.34° ± 3.56°(range 1°–16°), 3.25° ± 3.79°(range − 7° to −17°), 3.91° ± 3.15°(range − 1° to −13°), 0.60° ± 1.95°(range − 3° to −6°), respectively. There was no correlation between age and sFBA (CC = 0.192, p = 0.194) or cFBA (CC = 0.192, p = 0.194); similarly, there was no correlation between age and sFBA (CC = 0.067, p = 0.565) or cFBA (CC = 0.069, p = 0.549). The sFBA was correlated with cFBA and β angle (CC = 0.540, p < 0.01; CC = 0.543, p < 0.01, respectively), and the cFBA was correlated with mTFA (CC = 0.430, p < 0.01). There was no significant difference (p = 0.247) of cFBA between the patients with sFSB and the patients without sFSB. Conclusions The current study showed that the sFBA was correlated with cFBA in the patients undergoing TKA and the patients with sFSB usually presented non-cFSB. We also found that sFSB could affect the femoral component alignment in the sagittal plane and cFSB could affect the femoral component alignment in the coronal plane. The sFBA or cFBA was not correlated with age, BMI, or gender.

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Is the Femoral Component Flexion Affected by the Sagittal Femoral Shaft Bowing in Conventional Intramedually Guided TKA?

10.21203/rs.3.rs-853204/v1 ◽

2021 ◽

Author(s):

Xiaofeng Zhang ◽

Qianjin Wang ◽

Xingquan Xu ◽

Dongyang Chen ◽

Zhengyuan Bao ◽

...

Keyword(s):

Femoral Component ◽

Sagittal Plane ◽

Pearson Correlation ◽

Femoral Shaft ◽

Conventional Technique ◽

Component Alignment ◽

Chi Square ◽

Significant Difference ◽

Femoral Component Flexion ◽

Femoral Bowing

Abstract Background: The aim of the present study was to investigate the influence of sagittal femoral bowing on sagittal femoral component alignment, and whether there was correlation between sagittal femoral component alignment and coronal femoral component alignment.Methods: We retrospectively reviewed 77 knees in 71 patients who had undergone primary TKA for advanced osteoarthritis.All surgeries were performed by using a standard medial parapatellar approach. The osteotomy was performed with a conventional technique using an intramedullar rod for the femur and a mechanical extramedullar guiding system for the tibia. All patients enrolled in the study were evaluated with full-length lower extremity load-bearing standing scanograms and the patients had preoperative and postoperative radiographs of the knees. cFBA(coronal femoral bowing angle), sFBA(sagittal femoral bowing angle),and postoperatively, mTFA(mechanical tibiofemoral angle of the knee), β angle(femoral component flexion angle) were measured. The radiographic results of both groups were compared using Student's t test. A two-sided Pearson correlation coefficient was obtained to identify the correlations between FBA in the coronal and sagittal planes, as well as FBA and age or BMI, sFBA and β angle, cFBA and mTFA. Comparison of FSB incidence between different genders was using chi-square test. The p value <0.05 indicates a statistically significant difference.Results: The mean sFBA, cFBA, β angle, mTFA were 9.34°±3.56°(range 1°-16°), 3.25°±3.79°(range -7°-17°), 3.91°±3.15°(range -1°-13°), 0.60°±1.95°(range -3°-6°), respectively. There was no correlation between age and sFBA(CC=0.192, p=0.194) or cFBA(CC=0.192, p=0.194), similarly, there was no correlation between age and sFBA(CC=0.067, p=0.565) or cFBA(CC=0.069, p=0.549). The sFBA was correlated with cFBA and β angle(CC=0.540, p<0.01; CC=0.543, p<0.01; respectively) and the cFBA was correlated with mTFA(CC=0.430, p<0.01). There was no significant difference(p=0.247) of cFBA between the patients with sFSB and the patients without sFSB. Conclusions: The current study showed that the sFBA was correlated with cFBA in the patients undergoing TKA and the patients with sFSB usually presented non-cFSB. We also found that sFSB could affect the femoral component alignment in the sagittal plane and cFSB could affect the femoral component alignment in the coronal plane. The sFBA or cFBA was not correlated with age, BMI or gender.

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Comparison with Navigation of a Novel Three-Step Technique for Improving Accuracy of the Distal Femoral Resection during Conventional TKA: A Case–Control Study

The Journal of Knee Surgery ◽

10.1055/s-0041-1731458 ◽

2021 ◽

Author(s):

Arun B. Mullaji ◽

Ahmed A. Khalifa ◽

Gautam Shetty ◽

Harshad Thakur

Keyword(s):

Femoral Component ◽

Computer Navigation ◽

Varus Deformity ◽

Conventional Technique ◽

The Novel ◽

Coronal Alignment ◽

Component Alignment ◽

Term Survival ◽

Significant Difference ◽

The Mean

AbstractCorrect placement of the femoral component in the coronal plane during primary total knee arthroplasty (TKA) is related to long-term survival. The aim of this radiographic study was to determine the accuracy of a novel three-step technique for improving the accuracy of the distal femoral cut during conventional technique and compare it with computer navigation during TKA. A total of 458 TKAs were retrospectively analyzed (178 conventional TKAs with the novel technique and 280 navigated TKAs) for postoperative femoral component coronal alignment and compared between the two groups. Mean femoral component coronal alignment was not significantly different (p = 0.314) between the two groups. There was no significant difference in the mean femoral component coronal alignment between varus and valgus knees. The number of outliers (90 ± 3 degrees) for femoral component coronal alignment was not significantly different between the two groups when assessed separately for varus and valgus deformities. The mean value of femoral component alignment using the conventional technique in knees with varus deformity <10 degrees was 88.8 degrees, in knees with varus deformity 10 to 20 degrees was 89.4 degrees, and in those with varus deformity >20 degrees was 90.2 degrees. Femoral component alignment in knees with varus <10 degrees was significantly different from those >20 degrees (p = 0.006); there was no significant difference between knees with varus <10 degrees and those with 10 to 20 degrees varus (p = 0.251), nor between 10 and 20 degrees varus knees and those with varus >20 degrees (p = 0.116). Using the novel three-step technique during conventional TKA to perform the distal femoral cut can help achieve femoral component coronal alignment comparable to the navigation technique.

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DOES NAVIGATION TOTAL KNEE REPLACEMENT REALLY MAKE A DIFFERENCE?

Journal of Musculoskeletal Research ◽

10.1142/s0218957713500073 ◽

2013 ◽

Vol 16 (02) ◽

pp. 1350007

Author(s):

P. Motwani ◽

A. Jariwala ◽

N. Valentine

Keyword(s):

Total Knee Replacement ◽

Tibial Component ◽

Sagittal Plane ◽

Computer Navigation ◽

Component Alignment ◽

Tibial Component Alignment ◽

Significant Difference ◽

Total Knee ◽

The Mean

Background: Computer Navigation in Total Knee Replacement (TKR) has completed more than a decade since its inception. From that time, numerous studies have been done to see its effect on the variables of surgery and its outcome. Some studies have shown that it is definitely beneficial while others have negated its superiority over conventional techniques. This is an early outcome study on the results of navigation TKR in terms of alignment and clinical outcome at three years post-operatively. Methods: In the present study, 128 patients who had undergone navigation TKR (128 TKR) between January 2006 and November 2009 were included. The navigation system used was orthoPilot®. Patients were assessed post-operatively at one and three year using knee society score (KSS) and knee function score (KFS). All patients completed one year follow-up and 55 patients completed three year follow-up. From 128 patients, 40 navigated TKR patients operated between November 2007 and 2009 and were compared with 40 patients operated by conventional TKR operated between July 2007 and December 2008. Results: The mean KSS at 1 year post-operatively was 85.60 and at 3 years was 85.87. The mean KFS at 1 year post-operatively was 69.30 and at 3 years was 68.00. There was no statistically significant difference between navigation TKR and conventional TKR in terms of anatomical femoro-tibial alignment, femoral component alignment in coronal and sagittal plane and tibial component alignment in coronal plane. However, there was statistically significant difference between tibial component alignment in sagittal plane (p = 0.000) between both the groups. Conclusion: Computer navigation TKR affords a possibility to place both the femoral and tibial component very precisely without the risk of any greater axis deviation from ideal value. It helps in reducing the outliers in alignment of the limb and that of component and that improves the overall implant survival for a long time post-operatively.

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Clinical Significance of PLIF in Restoring L4-S1 Segmental Lordosis of 2-level Isthmic Spondylolisthesis

10.21203/rs.3.rs-198135/v1 ◽

2021 ◽

Author(s):

Jing-Yu Wang ◽

Fu-Sheng Liu ◽

Jing Li ◽

Xiao-Bin Wang

Keyword(s):

Sagittal Plane ◽

Pearson Correlation ◽

Isthmic Spondylolisthesis ◽

Improvement Rate ◽

Clinical Prognosis ◽

Vas Score ◽

Score Improvement ◽

Significant Difference ◽

Sagittal Parameters

Abstract Background: Spinal and pelvic sagittal plane balance is closely related to good clinical prognosis, so in the treatment of 2-level isthmic spondylolisthesis, attention should be paid not only to adequate nerve decompression, but also to the correction of lumbosacral sagittal plane parameters. The purpose of this study was to observe the clinical prognosis and sagittal parameters of patients with isthmic spondylolisthesis treated with PLIF, and to find out the risk factors leading to poor prognosis. Methods: From January 2006 to August 2018, the clinical data of patients with 2-level isthmic spondylolisthesis treated with PLIF in the Second Xiangya Hospital of Central South University were retrospectively collected. The clinical symptoms (JOA score and VAS score) and the sagittal parameters of lumbosacral segment (PI, PT, LL, L4-S1 SL, LDI, PI-LL, LL and L4-S1 SL) were recorded before operation, immediately after operation and at the last follow-up. According to the improvement rate of JOA score, the patients were divided into two subgroups, poor(P) group and good(G) group. The parameters within and between the two subgroups were compared. Meanwhile, Pearson correlation analysis was conducted between sagittal parameters and JOA score improvement rate.Results: A total of 52 patients were enrolled in this study, the average age was (59.96 ±9.11) years, and the mean follow-up time was (31.88 ±8.37) months. Group G (n = 37) and group P (n = 15). In terms of clinical symptom improvement and sagittal plane parameters, except PI, the other parameters of the patients were improved compared with those before operation, and the difference was statistically significant. In the intra-group comparison, except PI, other indexes in group G were significantly improved, while in group P, there was no significant difference in PI, LL, L4-S1 SL, LDI, PI-LL before and after operation. In the comparison between groups, there was no significant difference in baseline data between group G and group P; postoperative VAS score(back pain) in group G was lower than that in group P, but there was no significant difference in VAS score( leg pain); in terms of JOA score and JOA score improvement rate, group G was significantly better; △L4-S1 SL ,L4-S1 SL and LDI were larger in group G, and the proportion of patients with normal LDI was higher than that in group P. Pearson correlation analysis showed that postoperative △L4-S1 SL, LDI and L4-S1 SL were positively correlated with JOA improvement rate. 2 patients with failed internal fixation occurred in group P, and the postoperative LDI was less than 50%. Conclusion: PLIF is an effective method for the treatment of 2-level isthmic spondylolisthesis. ΔL4-S1 SL, L4-S1 SL and good LDI may be important sagittal parameters affecting the clinical prognosis of L4 and L5 isthmus spondylolisthesis.

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Effects of prophylactic ketamine and pethidine to control postanesthetic shivering: A comparative study

Biomedical Research and Therapy ◽

10.15419/bmrat.v5i12.508 ◽

2018 ◽

Vol 5 (12) ◽

pp. 2898-2903 ◽

Cited By ~ 1

Author(s):

Masoum Khoshfetrat ◽

Ali Rosom Jalali ◽

Gholamreza Komeili ◽

Aliakbar Keykha

Keyword(s):

Normal Saline ◽

Pearson Correlation ◽

Saline Group ◽

Normal Saline Group ◽

Chi Square ◽

Double Blind ◽

Postanesthetic Shivering ◽

Significant Difference ◽

The Mean ◽

One Way Anova

Background: Shivering is an undesirable complication following general anesthesia and spinal anesthesia, whose early control can reduce postoperative metabolic and respiratory complications. Therefore, this study aims to compare the effects of prophylactic injection of ketamine and pethidine on postoperative shivering. Methods: This double-blind clinical trial was performed on 105 patients with short-term orthopedic and ENT surgery. The patients were randomly divided into three groups; 20 minutes before the end of the surgery, 0.4 mg/kg of pethidine was injected to the first group, 0.5 mg/kg of ketamine was injected to the second group, and normal saline was injected to the third group. After the surgery, the tympanic membrane temperature was measured at 0, 10, 20, and 30 minutes. The shivering was also measured by a four-point grading from zero (no shivering) to four (severe shivering). Data were analyzed by one-way ANOVA, Kruskal Wallis, Chi-square and Pearson correlation. Results: The mean age of patients was 35.8+/-11.45 years in the ketamine group, 34.8+/-11.64 years in the normal saline group, and 33.11+/-10.5 years in the pethidine group. The one-way ANOVA showed no significant difference in the mean age between the three groups (P=0.645). The incidence and intensity of shivering were significantly higher in the normal saline group than in the ketamine and pethidine groups (p=0.001). However, there was no significant difference in the incidence and the intensity of shivering between the ketamine and the pethidine groups (p=0.936). Conclusion: The results showed that the 0.5 mg/kg of ketamine could control the post-anesthetic shivering.

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Knowledge of physiotherapists on the use of Muscle Energy Technique in the management of Non-Specific Low Back Pain

10.21203/rs.2.17864/v1 ◽

2019 ◽

Author(s):

Usman Abba Ahmed ◽

SONILL Sooknunan Maharaj ◽

Nadasan Thaya ◽

Bashir Kaka ◽

Ashiyat Kahinde Akodu

Keyword(s):

Low Back Pain ◽

Back Pain ◽

Pearson Correlation ◽

Descriptive Statistics ◽

Low Back ◽

Chi Square ◽

Muscle Energy Technique ◽

Significant Difference ◽

Muscle Energy ◽

Structured Questionnaire

Abstract Objective: The relevance and use of Muscle Energy Technique (MET) as a mode of treatment for Non-specific low back pain (NSLBP) over the last two decades has increased among physiotherapists and other health professionals. This supports the clinical relevance and efficacy of this technique. However, there are no studies to determine the level of MET knowledge among Nigerian physiotherapists. This study was designed to determine the MET knowledge among Nigerian physiotherapists.Method: A total of one hundred and twenty physiotherapists were recruited from the database of the Nigerian Society of Physiotherapy and participated in the study. They completed a semi-structured questionnaire containing 46-items. This was divided into four sections which sourced information on sociodemographic characteristics, work-profile, treatment activities and the knowledge of MET for the management of NSLBP. Data were analyzed using descriptive statistics for mean, frequency and percentages. Inferential statistics of Chi-square, Pearson Correlation, independent t-test and ANOVA were used to determine the significant difference with significance set at p<0.05.Result: The study revealed that 16.7% of the participants had knowledge of the application of MET in the management for NSLBP. Age, educational level, practice setting, area of specialization such as musculoskeletal therapy, ergonomics and additional training of low back pain (LBP) were factors that influenced respondents’ MET knowledge (p<0.05). However, gender, university of training, number of years of experience and the practice of managing of LBP in the physiotherapy department did not influence knowledge of MET for the management of NSLBP (p >0.05).Conclusion: This study showed that a small number of participants had knowledge of MET application in the management of NSLBP and certain factors influenced this knowledge. Keywords: Non-specific low back pain, Muscle Energy Technique, Physiotherapists knowledge, Nigeria

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The Modified Lateral Approach: Experience of a Single Center using an Alternative Technique to Conventional Transpedicular Percutaneous Vertebroplasty

American Journal of Interventional Radiology ◽

10.25259/ajir-51-2018 ◽

2019 ◽

Vol 3 ◽

pp. 6

Author(s):

Isabelle Dupuis ◽

Reza Forghani ◽

Huy Le

Keyword(s):

Vertebral Body ◽

Cement Leakage ◽

Conventional Technique ◽

Lateral Approach ◽

Bivariate Analysis ◽

Chi Square ◽

Transpedicular Approach ◽

Significant Difference ◽

Classic Approach ◽

Body Level

Objective: The objective of this study was to assess whether the placement of a needle more lateral to the pedicle while using a transpedicular approach compared to the conventional technique yields comparable or better vertebral body filling. Methods: Retrospective review of 134 thoracic and lumbar unipedicular vertebroplasties performed by a single radiologist (110 lateral and 24 classic). Vertebral bodies were divided into eight voxels on computed tomography and the percent of coverage was documented. 50% and 75% cement filling thresholds were defined as “efficient.” Complications were retrospectively collected. Chi-square (χ2) was used to compare the filling efficacy and rates of extravertebral cement leakage between the approaches. Bivariate analysis was performed to assess variables potentially influencing the efficacy. Results: There was no significant difference between the two approaches for 50% coverage (classic; n = 21 [87.5%] vs. lateral; n = 98 [89.1%], P = 0.8228). There was more efficient coverage >75% using the lateral approach (classic; n = 4 [16.7%] vs. lateral; n = 46 (41.8%), P = 0.0210). Vertebral body level (50.8% thoracic vs. 26.0% lumbar, P = 0.0031) and fracture type (45.6% pathological vs. 29.2% osteoporotic, P = 0.0444) were associated with 75% coverage. Three classic cases (12.5%) had extravertebral cement leakage versus 34 lateral cases (30.9%), which was not statistically significant (P = 0.0676). Other complications included one asymptomatic lung embolization using both approaches, one pedicular fracture using the classic approach, and one overnight admission for analgesia using the lateral approach. Conclusion: A modified lateral approach proved to be as safe and more effective in achieving 75% or more vertebral filling in treating compression fractures compared to the conventional approach.

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Randomized control trial comparing primary hip spica versus initial traction and hip spica of fracture at or below the junction of the upper and middle third of femur in children

Health Renaissance ◽

10.3126/hren.v13i2.17557 ◽

2017 ◽

Vol 13 (2) ◽

pp. 80-91

Author(s):

Pashupati Chaudhary ◽

AR Bajracharya ◽

A Joshi ◽

B Sharma ◽

R Bose ◽

...

Keyword(s):

Pediatric Population ◽

Femoral Shaft ◽

Wound Dehiscence ◽

P Value ◽

Chi Square ◽

Spica Casting ◽

Femur Fractures ◽

Fractures In Children ◽

Group I ◽

Significant Difference

Background: The debate regarding optimal management of femoral shaft fractures in the pediatric population is still far from resolved. While some consensus exists in the treatment of this injury in children younger than the age of six, opinion still widely divided in children six to 11 years.Objective: The aim of study was to compare the outcome of primary hip spica versus initial traction and hip spica of fracture of shaft of femur at or below the junction of the upper and middle third in children in terms of deformity and fracture healing.Method: A RCT study was carried out in the departments of Orthopedics, B.P.Koirala Institute of Health Sciences, Dharan, Nepal from March 2004 to January 2006. Forty five patients were included in the study in which 22 patients included in early spica casting (group I) and 23 patients in traction with spica casting (group II). The functional outcomes were assessed with Pearson’ Chi-square test, Independent samples test and union was assessed radiologically.Result: There was no statistically significant difference in time of union; all of them united in 8-10 weeks follow up. No significant overall difference in terms of deformity was noted in the two groups(p value-0.306).There was significant difference in terms of hospital stay in both the groups(p value<0.05).Conclusion: The study showed that there is significant advantage in primary hip spica cast for the treatment of isolated , closed femur fractures in children ages less than 10 years and weight less than 80 pounds(45kg) which allowed us to treat these fractures without any worry of wound dehiscence, pin site infections, avascular necrosis of the femoral head.Health Renaissance 2015;13(2): 80-91

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Overweightness and obesity prevalence among university students in 2015-2016 educational season

Journal of Human Sciences ◽

10.14687/jhs.v13i3.4293 ◽

2016 ◽

Vol 13 (3) ◽

pp. 5884 ◽

Cited By ~ 1

Author(s):

Eren Uluöz

Keyword(s):

University Students ◽

Normal Population ◽

Pearson Correlation ◽

Obesity Prevalence ◽

Chi Square ◽

Significance Level ◽

Significant Difference ◽

The Mean ◽

The Government ◽

The Individual

The main purpose of this study is to find out the obesity prevalence among university students. In addition to the main purpose, another aims of this study is to determine the individual features of participants related to obesity such as gender, age, being an obese in family and doing physical activity.This study was performed on university students from five different faculties of Çukurova University in 2015-2016 educational season. In this study, 894 volunteer students accepted for attending to the research. The mean age of female participants was 21.39±2.53 years. However, mean of males was 22.28±2.73 years. Descriptive study design and causal comparative methods were used. The individual information form created by the researcher was used to determine the demographic characteristics of the participants. BMI was analyzed both quantitative and categorical ways in this study. WHO’s classification method was used for categorizing of BMI. All findings in the study were summarized by descriptive statistical methods such as mean, standard deviation, frequency, percentage, etc. The independent sample T test, the ANOVA test, Pearson correlation test and chi-square test were used. In all analyzes, significance level was accepted as p <0.05.The mean of the BMI was calculated as 22.40±3.49 kg/m2. There was a statistically significant difference between the mean BMI of males (23.80±3.40 kg/m2) and female participants (21,01±2,99 kg/m2, t(-13,043)=892, p<0.05). Also, it was found statically significant difference among BMI classification groups for gender (obesity rate of male: 4.9% ; female:1.1%) , x2(df=3, n=894)=101.21, p<0.05. These results have indicated that the rate of obesity among university students is lower than normal population in Turkey. At the same time the findings of this study have shown similar characteristics with the university students’ of other countries reported by previous studies.In conclusion, it should be taken some measures for reducing overweightness and obesity such as increasing physical activity possibilities for people in all condition by local and central Governments, increasing the number of hours of physical education and sports lessons in schools as much as possible and the processing of these courses must be inspected strongly, more strict measures taken by the government to reduce obesity rates in society, informing and awareness of community on obesity, informing adequate and balanced nutrition by using the all media devices and facilities.

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The unicompartmental knee is the preferred side in individuals with both a unicompartmental and total knee arthroplasty

Knee Surgery Sports Traumatology Arthroscopy ◽

10.1007/s00167-019-05814-7 ◽

2019 ◽

Vol 28 (10) ◽

pp. 3193-3199 ◽

Cited By ~ 2

Author(s):

Anatole Vilhelm Wiik ◽

Dinesh Nathwani ◽

Ahsan Akhtar ◽

Bilal Al-Obaidi ◽

Robin Strachan ◽

...

Keyword(s):

Total Knee Arthroplasty ◽

Femoral Component ◽

Knee Arthroplasty ◽

Sagittal Plane ◽

Coronal Alignment ◽

Component Alignment ◽

Posterior Slope ◽

Knee Oa ◽

Unicompartmental Knee ◽

Total Knee

Abstract Purpose To determine the preferred knee in patients with both one total and one unicompartmental knee arthroplasty. Method Patients simply with a unicompartmental (UKA) and total knee arthroplasty (TKA) on contralateral sides were retrospectively screened from three senior knee surgeon’s logs over a 15 year period. Patients safe and free from other diseases to affect gait were approached. A total of 16 patients (mean age 70 ± 8) agreed to ground reaction force testing on an instrumented treadmill at a fair pace and incline. A gender-ratio identical group of 16 healthy control subjects (mean age 67 ± 10) and 16 patients with ipsilateral medial knee OA (mean age 66 ± 7) were analysed to compare. Results Radiographically the mode preoperative Kellgren–Lawrence knee grade for each side was 3. Postoperatively, the TKA side had a mean coronal femoral component alignment of 7° and a mean tibial coronal alignment of 89° with a mean posterior slope of 5° in the sagittal plane. The UKA side had a mean coronal femoral component alignment of 7° and a mean tibial coronal alignment of 86° with a mean posterior slope of 4° in the sagittal plane. In 7 patients, the TKA was the first procedure, while 6 for the UKA and 3 done simultaneously. Gait analysis demonstrated in both walking conditions the UKA limb was the preferred side through all phases of loading (p < 0.05) and nearer to normal than the TKA limb when compared to healthy controls and patients with knee OA. The greatest difference was observed between the transition of weight acceptance and midstance (p = 0.008), when 22% more load was taken by the UKA side. Conclusion By using a dynamic metric of an everyday activity, a distinct gait difference between differing arthroplasty types were established. A more natural loading pattern can be achieved with unicompartmentals as compared to total knees. Level of evidence Retrospective comparative study, Level III.

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