Abstract
For pre-operative osteoarthritis (OA) patients with varus knee, previous studies showed inconsistent results. Therefore, we conducted this study to better identify the association of Hospital for Special Surgery (HSS) score and mechanical alignment. 44 patients (51 knees) with constitutional varus knee caused by combined deformities (LDFA (lateral distal femoral angle) > 90°and MPTA (medial proximal tibial angle) < 85°)) were selected and analyzed with a mean follow-up period of 14 months after total knee arthroplasty (TKA). From January 2015 to December 2016, patients were collected consecutively after primary TKA. After filtering, fifty-one knees (44patients) were analyzed with a mean follow-up period of 14 months. All patients were divided into two groups based on post-operative hip-knee-ankle (HKA) acute angle: varus mechanical alignment (VMA) group (HKA < − 3°) and neutral mechanical axis (NMA) group (− 3° ≤ HKA ≤ 3°). 30 knees were included in the NMA group, and 21 knees in the VMA group. Comparisons of HSS between NMA group and VMA group were performed. After adjusting for age and Body Mass Index (BMI) confounders, Compared with NMA group, the HSS score in VMA group decreased by 0.81 units (95% CI, − 3.37 to 1.75) p = 0.5370). For pre-operative constitutional varus knee caused by combined deformities in chinese populations, no significant association between post-operative lower limb mechanical alignment and HSS score was found.
Highlights
For pre-operative osteoarthritis (OA) patients with varus knee, previous studies showed inconsistent results
Achieving a post-operative neutral lower limb mechanical alignment within 3° is regarded as a golden standard in total knee arthroplasty (TKA) for a long time, which is widely regarded being associated with optimal clinical function
We conducted a retrospective study in Chinese populations to better identify the association of post-operative mechanical alignment and Hospital for Special Surgery (HSS) score after primary TKA of patients suffering from constitutional varus knee that caused by combined deformities
Summary
For pre-operative osteoarthritis (OA) patients with varus knee, previous studies showed inconsistent results. All patients were divided into two groups based on post-operative hipknee-ankle (HKA) acute angle: varus mechanical alignment (VMA) group (HKA < − 3°) and neutral mechanical axis (NMA) group (− 3° ≤ HKA ≤ 3°). For pre-operative constitutional varus knee caused by combined deformities in chinese populations, no significant association between post-operative lower limb mechanical alignment and HSS score was found. Achieving a post-operative neutral lower limb mechanical alignment within 3° is regarded as a golden standard in total knee arthroplasty (TKA) for a long time, which is widely regarded being associated with optimal clinical function. Many studies have explored the association between post-operative mechanical alignment and clinical outcomes in pre-operative varus knee populations, it is worth noting that previous studies showed inconsistent results[14,15,16]. The majority of patients in above studies were Europeans or Americans who previously had varus knees, and their results may not be generalized to other populations with different lifestyles or disease
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