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High Prevalence of Isolated Antero-medial Osteoarthritis (AMOA) in Indian Patients Undergoing Primary Total Knee Arthroplasty

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Abstract

Background

Isolated antero-medial osteoarthritis (AMOA) of the knee is a distinct pattern of arthritis. Medial arthritis of the knee in select patients can be managed with uni-compartmental arthroplasty (UKA), with studies showing shorter hospital stay, faster rehabilitation and reduced medical complications in the post-operative period compared to TKA. However, the prevalence of AMOA in Indian patients with osteoarthritis of the knee is unknown. The aim of this study was to evaluate the prevalence of AMOA in patients undergoing primary TKA for OA.

Methods

This was a prospective evaluation of 2518 knees in 1936 patients who were selected for primary TKA. Pre-operative radiographs were screened based on the Oxford UKA Radiological decision aid and diagnosis of AMOA was established. All 2518 knees underwent primary total knee arthroplasty and cases of AMOA were confirmed intra-operatively based on ACL integrity, lateral compartment wear and medial compartment wear pattern. Cases with AMOA arthritic wear pattern were considered amenable for UKA if radiographs showed intact lateral joint space, intra-operatively those with intact and functional ACL, acceptable patellofemoral wear (Outerbridge I–II).

Results

We report a prevalence of 46.94% of AMOA, who were amenable for UKA. Obese patients were more likely to have a damaged or non-functional ACL and more likely to have a high degree of wear, not amenable for UKA (p < 0.05). Non-functional ACL was associated with higher prevalence of posterior extension of arthritic wear.

Conclusion

This study demonstrated a high prevalence (46.94%) of antero-medial osteoarthritis (AMOA), amenable for UKA. Patient selection is important for improving outcomes after TKA or UKA. Future studies are warranted to compare outcomes of both UKA and TKA in patients with isolated AMOA of the knee.

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Authors and Affiliations

  1. Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, Ramgopalpet, Secunderabad, Hyderabad, Telangana, 500003, India

    Adarsh Annapareddy, Deepesh Daultani, Praharsha Mulpur, Vishesh Khanna & A. V. Gurava Reddy

  2. Yashoda Hospitals, Hyderabad, India

    Sukesh Rao Sankineani

  3. Department of Orthopaedics, Medicover Hospitals, Hyderabad, India

    Krishna Kiran Eachempati

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  1. Adarsh Annapareddy
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Contributions

Conceptualization: AVGR, AA; Methodology: DD, AA; Formal Analysis and Investigation: DD, VK, PM; Writing—Original Draft: DD, VK; Writing—Review and Editing: PM, SRS, KKE; Resources: AVGR; Supervision: AVGR, KKE.

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Correspondence to Praharsha Mulpur.

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Annapareddy, A., Daultani, D., Mulpur, P. et al. High Prevalence of Isolated Antero-medial Osteoarthritis (AMOA) in Indian Patients Undergoing Primary Total Knee Arthroplasty. JOIO 56, 1774–1781 (2022). https://doi.org/10.1007/s43465-022-00710-8

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