Why Bricklayers Often Develop Hip and SIJ Dysfunction

Asymmetric Load Carrying and Pelvic Loading

Bricklaying is fundamentally an asymmetric trade. The dominant hand holds and places the brick; the other hand holds the trowel; and the carrying of brick coursework, mortar boards, and block supplies is frequently one-sided for practical convenience. This persistent asymmetric loading — both in the carrying of materials and in the lateral trunk bend and rotation that precise bricklaying requires — imposes consistently higher loads on one side of the lumbar spine, pelvis, and hip complex than the other. Over years of trade work, this asymmetric loading produces measurable differences in muscular development, joint loading history, and connective tissue adaptation between the two sides of the body.

The sacroiliac joint is particularly vulnerable to this asymmetric pattern. The SIJ is designed to transmit load symmetrically between the lumbar spine and the lower limbs; it achieves this through the form closure of its irregular articular surfaces and the force closure provided by the posterior oblique and anterior oblique muscle slings that compress it bilaterally. When loading is consistently asymmetric — more weight borne on one leg, more trunk lateral flexion toward one side, asymmetric hip and lumbar muscle activation — the compressive force across the SIJ is unequal, and the side receiving greater load progressively develops the articular sensitivity, posterior ligament strain, and periarticular muscle guarding that presents clinically as unilateral buttock and posterior pelvic pain.

Squatting, Rising, and Hip Biomechanics

A bricklayer working on courses below waist height spends substantial portions of the working day squatting — lowering to reach lower courses and rising to stand between each brick. This repetitive squat-and-rise pattern is not a planned exercise; it is performed at speed, under load (the weight of the brick and the postural demands of precision placement), and without the preparatory joint control that exercise-based squatting involves. The hip flexors, quadriceps, and gluteals absorb the load of each squat; the hip external rotators stabilise the pelvis and femur against the rotation that each asymmetric stance requires. Over the course of hundreds of squat-rise cycles per day, the hip external rotators — piriformis, obturator externus, the gemelli — develop the tightness and trigger point activity that restricts internal rotation and generates the deep buttock and groin pain that bricklayers describe.

Mortar Handling and Spinal Loading

The mixing, loading, and transport of mortar adds substantial manual handling demands to the postural loading of bricklaying. A standard mortar board carries 15–25 kg; a full hod of mortar carried on the shoulder can exceed 30 kg. Repeated loading and unloading of mortar, combined with the sustained vibration exposure of operating mixers, adds lumbar compressive loading events to an already high-baseline loading day. Scaffold-based work adds the additional challenge of constrained postures and dynamic balance demands on working platforms, further reducing the ability to select mechanically optimal postures for individual tasks.

Management

SIJ dysfunction responds well to targeted mobilisation and manipulation, restoring the articular mechanics that asymmetric loading has compressed and restricted. Hip external rotator release — piriformis and the deep rotator group — through myofascial techniques or dry needling reduces the buttock pain and pseudo-sciatic referral that accompanies their chronic hypertonicity. Progressive gluteal strengthening, particularly of the gluteus medius in its stabilising role, rebuilds the force closure mechanism that asymmetric work has compromised. Occupational ergonomic advice — alternating the carry side, using material handling equipment for heavy supply loads, and working from adjustable scaffold to maintain waist-height working — directly addresses the loading patterns driving the condition.