This retrospective cohort introduces the Humeral Bone Loss (HUMBL) classification, a 5-pattern radiograph-based system for primary and revision shoulder arthroplasty. It asks whether more severe bone loss patterns predict worse outcomes. Outcomes measured were all-cause revision, instability, and humeral loosening across 1,083 shoulders.
When you look at a preop shoulder arthroplasty radiograph, sort the humeral bone loss into one of 5 HUMBL patterns, because severity predicts what will go wrong.
The key new concept is ectatic bone loss: a pathologically widened endosteal canal that cannot hold a standard implant and lacks metaphyseal bone for a solid cement interface. Recognize it and plan for an APC or megaprosthesis, not a routine stem.
The most testable mental model here mirrors the hip: ectatic humeral loss is the shoulder analog of Paprosky type IV femoral deficiency, and it carries the worst prognosis (46% five-year survival free of loosening). Also useful clinically: isolated greater tuberosity compromise raises instability but not loosening, so an intact medial calcar keeps height restoration and fixation straightforward.
This is a Level III prognostic study from three high-volume revision surgeons, so the low complication rates in intact bone may not generalize to lower-volume practice, and it stops short of giving a treatment algorithm.
The Humeral Bone Loss (humbl) Classification Identifies Patterns of Humeral Bone Loss Associated with Various Revision, Instability, and Humeral Loosening Rates in Primary and Revision Shoulder Arthroplasty.
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This retrospective cohort introduces the Humeral Bone Loss (HUMBL) classification, a 5-pattern radiograph-based system for primary and revision shoulder arthroplasty. It asks whether more severe bone loss patterns predict worse outcomes. Outcomes measured were all-cause revision, instability, and humeral loosening across 1,083 shoulders.
When you look at a preop shoulder arthroplasty radiograph, sort the humeral bone loss into one of 5 HUMBL patterns, because severity predicts what will go wrong.
The key new concept is ectatic bone loss: a pathologically widened endosteal canal that cannot hold a standard implant and lacks metaphyseal bone for a solid cement interface. Recognize it and plan for an APC or megaprosthesis, not a routine stem.
The most testable mental model here mirrors the hip: ectatic humeral loss is the shoulder analog of Paprosky type IV femoral deficiency, and it carries the worst prognosis (46% five-year survival free of loosening). Also useful clinically: isolated greater tuberosity compromise raises instability but not loosening, so an intact medial calcar keeps height restoration and fixation straightforward.
This is a Level III prognostic study from three high-volume revision surgeons, so the low complication rates in intact bone may not generalize to lower-volume practice, and it stops short of giving a treatment algorithm.