Radiographic Comparison of the Mechanical Axis Including Calcaneus to the Conventional Mechanical Axis in Medial Unicompartmental Knee Arthroplasty

J Knee Surg DOI: 10.1055/s-0039-3402044Since a hindfoot alignment is not included in the conventional mechanical axis (hip–ankle [HA] line), a mechanical axis including the calcaneus (hip–calcaneus [HC] line) has recently attracted attention as an alternative weight-bearing line. However, there are few reports on unicompartmental knee arthroplasty (UKA) regarding the HC line. Therefore, this study aimed to compare postoperative alignments after UKA between the HA line and the HC line. Postoperatively, HC radiographs were taken in 88 consecutive patients who underwent medial UKA. The hip–knee–ankle (HKA) and hip–knee–calcaneus (HKC) angles were compared in the same patient. Regarding tibial inclination, the conventional tibial component–ankle (TCA) angle was compared with reference to the HC line (tibial component–calcaneus [TCC] angle). The mean postoperative HKA and HKC angles were 2.8 ± 2.7 and 2.0 ± 2.5 degree, respectively. The mean postoperative TCA and TCC angles were 87.7 ± 2.1 and 88.5 ± 2.1 degree, respectively. There were significant differences between the two groups in both lower limb alignment and tibial component angle. The present study indicated that the HKC and the TCC angles significantly decreased the varus alignment by approximately 1 degree compared with the HKA and TCA angles. Neutral in the HA line corresponds to valgus in ...
Source: Journal of Knee Surgery - Category: Orthopaedics Authors: Tags: Original Article Source Type: research

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We describe, in this article, the hinged joint distraction technique. A total of 50 patients with posttraumatic ankle osteoarthritis with a mean age of 40.0±8.5 years were included in a prospective randomized study: 25 patients in ankle debridement alone group and 25 patients in debridement and hinged ankle distraction group. The mean follow-up was 46±12 months (range: 36 to 78 mo). The clinical and radiographic outcomes were evaluated at the 6-month and 3-year follow-up using the Visual Analog Scale (VAS), American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot score, SF-36 quality of life score,...
Source: Techniques in Foot and Ankle Surgery - Category: Orthopaedics Tags: Special Focus Source Type: research
AbstractPurposeThe purpose of this study was to analyze the long-term clinical and radiological outcomes of patients who underwent closing-wedge High Tibial Osteotomy (HTO) for the treatment of medial compartment osteoarthritis and to evaluate the conversion rate to knee arthroplasty.MethodsA retrospective, non-randomized, monocentric study was performed in our Institution considering 166 patients between 1989 and 2012. The final population was composed by 82 patients (94 knees), median age at time of operation was 53 (range 45 –73) years. All patients were evaluated clinically (HSS Score, Tegner Scale, VAS and Crosb...
Source: Knee Surgery, Sports Traumatology, Arthroscopy - Category: Orthopaedics Source Type: research
In conclusion, although the incidence of heterotopic ossification after TAA is considerable, there is insufficient literature to suggest that heterotopic ossification after TAA impacts range of motion or functional outcome.
Source: The Journal of Foot and Ankle Surgery - Category: Orthopaedics Source Type: research
ConclusionVarus deformity in the proximal part of the tibia, immediate postoperative varus alignment, and varus position of the femoral and tibial components may lead to varus progression in limb alignment in the long term, even 10  years after TKA; the surgeon should, therefore, weigh the risks of leaving a varus alignment during surgery. Moreover, if the preoperative TPTPS angle is high, the alignment may become varus after TKA, even in patients who have acquired neutral alignment.Level of evidenceIV.
Source: Knee Surgery, Sports Traumatology, Arthroscopy - Category: Orthopaedics Source Type: research
CONCLUSION: In varus knees, the proximal tibia has a medial shift of the TAS that may influence the value of the HKA angle. PMID: 32067563 [PubMed - in process]
Source: Journal of Orthopaedic Surgery - Category: Orthopaedics Authors: Tags: J Orthop Surg (Hong Kong) Source Type: research
Publication date: Available online 26 December 2019Source: The Journal of Foot and Ankle SurgeryAuthor(s): Jonathan Lee, Eric So, Daniel B. LoganAbstractThe purpose of this study is to report the outcome of the conversion of a first metatarsophalangeal (MTP) joint arthrodesis to an interpositional arthroplasty with an acellular dermal matrix for a chronic nonhealing first ray wound. To our knowledge, this is the first case report converting a first ray arthrodesis to an interpositional arthroplasty to heal a chronic ulceration. A 78-year-old female developed a chronic neuropathic ulceration under the first metatarsal head ...
Source: The Journal of Foot and Ankle Surgery - Category: Orthopaedics Source Type: research
Abstract It is controversial whether supramalleolar osteotomy is suitable for Takakura Stage 3B osteoarthritis or not. The aim of this study was to evaluate the outcomes of supramalleolar osteotomy in patients with Takakura 3B osteoarthritis. From February 2008 to August 2013, supramalleolar osteotomy was performed in 21 patients matching the inclusion criteria. The mean patient age at operation was 53.7±5.8 years (range: 39 to 61 years). The mean duration of follow-up was 87.7±19.5 months (range: 61 to 125 months). The radiologic evaluation included the tibial articular surface (TAS) angle, tibial l...
Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research
CONCLUSIONS: It may be important to recognise whether a THA patient has a fixed pelvic axial rotational deformity, where 1 hip is consistently forward or backward in functional imaging. Fixed rotation will increase or decrease the functional anteversion of an acetabular component depending on THA side. Further research might better characterise associations and predictors of fixed axial rotation and its impact on patient outcomes after THA. PMID: 31830818 [PubMed - as supplied by publisher]
Source: Hip International - Category: Orthopaedics Authors: Tags: Hip Int Source Type: research
ConclusionAt the 2-year follow-up, no correlation between the post-operative AP offset ratio and functional outcome scores was observed between the two fixed-bearing-implant groups. Further studies with longer follow-up are needed to determine whether the difference in sagittal alignment has an effect on functional outcomes in the long term.
Source: HSS Journal - Category: Orthopaedics Source Type: research
Abstract BACKGROUND: Previously, the authors modified the surgical technique to preserve tibial bone mass for Oxford unicompartmental knee arthroplasty (UKA). The purpose of this study was to determine the clinical outcomes and values of this modified technique. METHODS: Clinical data of 34 consecutive patients who underwent the unilateral modified UKA technique (modified group, 34 knees) were retrospectively analyzed. To compare the outcome, a match-paired control group (conventional group, 34 knees) of an equal number of patients using the conventional technique system in the same period were selected and m...
Source: Chinese Medical Journal - Category: General Medicine Authors: Tags: Chin Med J (Engl) Source Type: research
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